Newton v. Merrill Lynch , 259 F.3d 154 ( 2001 )


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  •                                                                                                                            Opinions of the United
    2001 Decisions                                                                                                             States Court of Appeals
    for the Third Circuit
    8-6-2001
    Newton v. Merrill Lynch
    Precedential or Non-Precedential:
    Docket 00-1586
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    Recommended Citation
    "Newton v. Merrill Lynch" (2001). 2001 Decisions. Paper 174.
    http://digitalcommons.law.villanova.edu/thirdcircuit_2001/174
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    Filed August 6, 2001
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    No. 00-1586
    KENNETH E. NEWTON; MLPF&S CUST. FPO,
    BRUCE ZAKHEIM IRA FBO BRUCE ZAKHEIM
    v.
    MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.;
    PAINEWEBBER, INC.
    (D.C. No. 94-cv-5343)
    JEFFREY PHILLIP KRAVITZ
    v.
    DEAN WITTER REYNOLDS, INC.
    (D.C. No. 95-cv-213)
    MLPF&S Cust. FPO, Bruce Zakheim IRA
    FBO Bruce Zakheim, Jeffrey Phillip Kravitz,
    Gloria Binder,
    Appellants
    On Appeal from the United States District Court
    for the District of New Jersey
    D.C. Civil Action Nos. 94-cv-05343 & 95-cv-00213
    (Honorable Dickinson R. Debevoise)
    Argued: December 14, 2000
    Before: SCIRICA, FUENTES and GARTH, Circuit Ju dges
    (Filed: August 6, 2001)
    KAREN L. MORRIS, ESQUIRE
    (ARGUED)
    Morris & Morris
    1105 North Market Street,
    Suite 1600
    Wilmington, Delaware 19801
    Attorney for Appellants
    STEPHEN M. SHAPIRO, ESQUIRE
    (ARGUED)
    Mayer, Brown & Platt
    190 South LaSalle Street
    Chicago, Illinois 60603
    Attorney for Appellees,
    Merrill Lynch, Pierce, Fenner &
    Smith, Inc., PaineWebber, Inc.,
    and Dean Witter Reynolds, Inc.
    DAVID A. BROWNLEE, ESQUIRE
    Kirkpatrick & Lockhart
    Henry W. Oliver Building
    535 Smithfield Street
    Pittsburgh, Pennsylvania 15222
    Attorney for Appellee,
    Merrill Lynch, Pierce, Fenner &
    Smith, Inc.
    PAUL J. FISHMAN, ESQUIRE
    Friedman, Kaplan & Seiler
    One Gateway Center, 25th Floor
    Newark, New Jersey 07102
    ROBERT B. McCAW, ESQUIRE
    Wilmer, Cutler & Pickering
    520 Madison Avenue
    New York, New York 10022
    Attorneys for Appellee,
    PaineWebber, Inc.
    2
    WILLIAM H. PRATT, ESQUIRE
    Kirkland & Ellis
    Citigroup Center
    153 East 53rd Street
    New York, New York 10022
    Attorney for Appellee,
    Dean Witter Reynolds, Inc.
    KARL A. GROSKAUFMANIS,
    ESQUIRE
    Fried, Frank, Harris, Shriver &
    Jacobson
    1001 Pennsylvania Avenue, N.W.,
    Suite 800
    Washington, D.C. 20004
    Attorney for Amicus Curiae-
    Appellees, Securities Industry
    Association
    OPINION OF THE COURT
    SCIRICA, Circuit Judge.
    In this putative class action under S 10(b) of the
    Securities Exchange Act of 1934 and Rule 10b-5,
    thousands of investors sued their broker-dealers, who
    traded on the National Association of Securities Dealers
    Automated Quotation System (NASDAQ), for breaching
    their duty of best execution. Despite the broker-dealers'
    duty to execute trades under the most "favorable terms
    reasonably available," the investors charge the defendants
    executed orders at the price offered on the central National
    Best Bid and Offer system (NBBO), failing to investigate
    other feasible alternatives that potentially offered better
    prices. With hundreds of thousands of investors in the
    putative class, this alleged practice affected hundreds of
    millions of transactions.
    The crux of this interlocutory appeal under Fed. R. Civ.
    P. 23(f) is whether plaintiffs' securities fraud claims satisfy
    the requirements for class certification under Fed. R. Civ. P.
    3
    23. The District Court denied plaintiffs' petition for class
    certification. We will affirm.
    I.
    The District Court had jurisdiction over the federal claims
    arising under the Securities Exchange Act of 1934, 15
    U.S.C. S 78j(b), and 28 U.S.C. S 1331, as well as
    supplemental jurisdiction over the state law claims under
    28 U.S.C. S 1367. Plaintiffs filed a petition for permission to
    appeal the denial of class certification under Fed. R. Civ. P.
    23(f) which we granted. As an interlocutory appeal, we have
    jurisdiction under 28 U.S.C. S 1292(e).
    II.
    In 1998, the Supreme Court responded to the risk of
    improvident and largely unreviewable class certification
    decisions by amending Fed. R. Civ. P. 23 to provide for
    interlocutory appeal by permission of the court of appeals.1
    Recognizing that denying or granting class certification is
    often the defining moment in class actions (for it may
    sound the "death knell" of the litigation on the part of
    plaintiffs, or create unwarranted pressure to settle
    nonmeritorious claims on the part of defendants), the Rule
    acknowledges the extraordinary nature of class actions and
    permits the appellate courts to develop a coherent body of
    jurisprudence in this area.2
    _________________________________________________________________
    1. The permissive interlocutory appeal provision was adopted under the
    power conferred by 28 U.S.C. S 1292(e).
    2. Before Rule 23(f) was promulgated, the Supreme Court rejected the
    "death knell" doctrine as a justification for circumventing the federal-
    appellate-jurisdiction precondition that a district court decision " `end[
    ]
    the litigation on the merits and leave[ ] nothing for the court to do but
    execute the judgment.' " Coopers & Lybrand v. Livesay, 
    437 U.S. 463
    ,
    467 (1978) (quoting Catlin v. United States, 
    324 U.S. 229
    , 233 (1945)). In
    these instances, appellate jurisdiction was limited by 28 U.S.C. S 1291,
    which provided that the "courts of appeals shall have jurisdiction of
    appeals from all decisions of the district courts of the United States . .
    .
    except where a direct review may be had in the Supreme Court." 28
    U.S.C. S 1291 (1978). Because plaintiffs had the opportunity to pursue
    4
    The new Rule provides that "[a] court of appeals may in
    its discretion permit an appeal from an order of a district
    court granting or denying class action certification under
    this rule if application is made to it within ten days after
    entry of the order." Fed. R. Civ. P. 23(f). Before its adoption,
    courts were hesitant to invoke an alternative grant of
    appellate jurisdictional authority under 28 U.S.C.S 2072(c),
    which enabled the Supreme Court by rule to "define when
    a ruling of a district court is final for the purposes of appeal
    under section 1291." 28 U.S.C. S 2072(c); see also Blair v.
    Equifax Checking Servs., Inc., 
    181 F.3d 832
    , 833 (7th Cir.
    1999) (noting this authority "had gone unused, in part
    because it invites the question whether a particular rule
    truly `defines' or instead expands appellate jurisdiction");
    7B Charles Alan Wright, Arthur R. Miller & Mary Kay Kane,
    Federal Practice and Procedure S 1802, pp. 105-06 (West
    Supp. 2000) (hereinafter Wright, Miller & Kane) ("[Rule
    23(f)] is modelled on Section 1292(b), but differs in
    significant respects from that device in that it requires only
    appellate court approval of the appeal and it does not
    require that the district court's decision involve`a
    controlling question of law' about which the courts are
    divided."). On occasion, courts granted writs of mandamus
    to review certification decisions but with an uneasiness that
    their actions stretched the writ's traditionally restrictive
    parameters. See 5 James Wm. Moore et al., Moore's Federal
    Practice S 23.61[9][c] (discussing standard and cases); see
    also, e.g., In re Rhone-Poulenc Rorer Inc. , 
    51 F.3d 1293
    (7th
    Cir. 1995) (granting order of mandamus to rescind class
    _________________________________________________________________
    litigation individually if class certification was denied, a district
    court
    decision decertifying a putative class did not constitute a final decision
    under 28 U.S.C. S 1291. 
    Livesay, 437 U.S. at 467
    . At the time, there
    existed no special rules on appealing class certification decisions.
    Reasoning that a "death knell" exception would have to apply with equal
    force to all forms of litigation, the Court rejected this proposition.
    While
    the Court recognized several policy arguments in favor of permitting
    appeals of certification decisions which effectively put an end to
    litigation, without legislative guidance or authority, it ultimately found
    the arguments against such a rule more persuasive. 
    Id. at 470-77.
    The
    new Rule 23(f) provides the authority as well as the guidance for these
    appeals which was previously wanting.
    5
    certification). Although we have issued rulings on Rule 23(f)
    motions, we have yet to articulate standards for granting or
    denying permission to appeal.3
    The Committee Note is always a good starting point. It
    emphasizes that "[t]he court of appeals is given unfettered
    discretion whether to permit the [interlocutory] appeal, akin
    to the discretion exercised by the Supreme Court in acting
    on a petition for certiorari." Comm. Note, Fed. R. Civ. P.
    23(f). The Note also sketches a rough outline of the types of
    cases courts of appeals should review: "Permission is most
    likely to be granted when the certification decision turns on
    a novel or unsettled question of law, or when, as a practical
    matter, the decision of certification is likely dispositive of
    the litigation."4 Id.; see also 5 Moore's Federal Practice
    S 23.61[9][b]. To provide further guidance on how to
    separate the wheat from the chaff, the Note instructs that
    several concerns justify expansion of present
    opportunities to appeal. An order denying certification
    may confront the plaintiff with a situation in which the
    only sure path to appellate review is by proceeding to
    final judgment on the merits of an individual claim
    that, standing alone, is far smaller than the costs of
    litigation. An order granting certification, on the other
    hand, may force a defendant to settle rather than incur
    the costs of defending a class action and run the risk
    of potentially ruinous liability.
    Comm. Note, Fed. R. Civ. P. 23(f). We can glean from the
    Note, therefore, at least three principles to guide the
    appellate courts in their exercise of discretionary
    jurisdiction: (1) when denial of certification effectively
    _________________________________________________________________
    3. Fortunately, four of our sister circuits have written thoughtful
    opinions on the new rule. Lienhart v. Dryvit Sys., Inc., No. 00-908, 
    2001 WL 715773
    , at *2-5 (4th Cir. June 26, 2001); Prado-Steiman v. Bush,
    
    221 F.3d 1266
    , 1271-77 (11th Cir. 2000); Waste Mgmt. Holdings, Inc. v.
    Mowbray, 
    208 F.3d 288
    , 292-95 (1st Cir. 2000); Blair v. Equifax
    Checking Servs., Inc., 
    181 F.3d 832
    , 833-36 (7th Cir. 1999).
    4. In effect, the Rule authorizes appellate courts to "restore equilibrium
    when a doubtful class certification ruling would virtually compel a party
    to abandon a potentially meritorious claim or defense before trial."
    
    Mowbray, 208 F.3d at 293
    .
    6
    terminates the litigation because the value of each
    plaintiff 's claim is outweighed by the costs of stand-alone
    litigation; (2) when class certification places inordinate or
    hydraulic pressure on defendants to settle, avoiding the
    risk, however small, of potentially ruinous liability; and (3)
    when an appeal implicates novel or unsettled questions of
    law; in this situation, early resolution through interlocutory
    appeal may facilitate the orderly development of the law.5
    But interlocutory review is not cabined by these
    circumstances. The Note signals that the new Rule gives
    _________________________________________________________________
    5. Other courts of appeals have adopted a taxonomy based on these
    principles. In the first case examining the standards for interlocutory
    appeal, Blair v. Equifax Checking Servs., Inc. , 
    181 F.3d 832
    , 833-36 (7th
    Cir. 1999), the Court of Appeals for the Seventh Circuit provided an in-
    depth description of the three examples mentioned above that would
    merit exercise of interlocutory review. Taking its cue from the Committee
    Note, the court held that cases where certification tolled the "death
    knell"
    of litigation for plaintiffs or placed irresistible pressure to settle on
    defendants presented circumstances ripe for review. The court also held
    that appeals which would help develop the law similarly invited the
    exercise of this review. In Waste Mgmt. Holdings, Inc. v. Mowbray, 
    208 F.3d 288
    , 292-95 (1st Cir. 2000), the Court of Appeals for the First
    Circuit largely adopted the Seventh Circuit's methodology with one
    restriction. To prevent fecund legal minds from framing every legal issue
    as an important question of fundamental law, the court narrowed this
    review to cases in which "an appeal will permit the resolution of an
    unsettled legal issue that is important to the particular litigation as
    well
    as important in itself and likely to escape effective review if left
    hanging
    until the end of the case." 
    Id. at 294.
    Thereafter, the Court of Appeals
    for
    the Eleventh Circuit discussed the standards for reviewing petitions in
    Prado-Steiman v. Bush, 
    221 F.3d 1266
    , 1271-77 (11th Cir. 2000). Adding
    other factors, the court elaborated on the principles set forth previously
    by the Court of Appeals for the Seventh Circuit. In addition to those
    already mentioned, the court looked to (1) whether the certification
    decision is likely dispositive of the litigation; (2) whether the decision
    involved a novel or unsettled legal question; (3) the strength of the
    district court's reasoning; (4) the status of the case before the district
    court; and (5) the "likelihood that future events may make immediate
    appellate review more or less appropriate." 
    Id. at 1276.
    Recently, the
    Court of Appeals for the Fourth Circuit reviewed the standards for
    granting a motion under Fed. R. Civ. P. 23(f) and adopted the analysis
    enunciated in Prado-Steiman. Lienhart v. Dryvit Sys., Inc., No. 00-908,
    
    2001 WL 715773
    , at *2-5 (4th Cir. June 26, 2001).
    7
    appellate courts broad discretion. For example, an error in
    the class certification decision that does not implicate novel
    or unsettled legal questions may still merit interlocutory
    review given the consequences likely to ensue. To put it
    another way, if the appellant demonstrates that the ruling
    on class certification is likely erroneous, " `taking into
    account the discretion the district judge possesses in
    implementing Rule 23, and the correspondingly deferential
    standard of appellate review,' " Mowbray , 208 F.3d at 293
    (quoting 
    Blair, 181 F.3d at 835
    ), interlocutory review may
    be proper.
    Furthermore, as explained in the Note, interlocutory
    review is not constrained by the potentially limiting
    requirement of 28 U.S.C. S 1292(b) that the district court
    order "involve[ ] a controlling question of law as to which
    there is a substantial ground for difference of opinion and
    that an immediate appeal from the order may materially
    advance the ultimate termination of the litigation." Yet if
    allowing the litigation to follow its natural course would
    provide the moving party with an adequate remedy,
    interlocutory review will generally prove unnecessary. In the
    end, however, the courts of appeals are afforded wide
    latitude as "[p]ermission to appeal may be granted or
    denied on the basis of any consideration that the courts of
    appeals finds persuasive." Comm. Note, Fed. R. Civ. P.
    23(f).
    We believe these principles provide a useful template for
    courts to work from when evaluating petitions under Rule
    23(f). It is, of course, difficult to foresee all the
    permutations to which this rule will apply, and courts will
    have the task of exercising their best judgment in making
    these decisions. See Lienhart, 
    2001 WL 715773
    , at *4
    (rejecting "stringent standards" for review of Rule 23(f)
    petitions); 
    Blair, 181 F.3d at 834
    ("[I]t would be a mistake
    for us to draw up a list that determines how the power
    under Rule 23(f) [should] be exercised. Neither a bright-line
    approach nor a catalog of factors would serve well--
    especially at the outset, when courts necessarily must
    experiment with the new class of appeal."); see also Comm.
    Note, Fed. R. Civ. P. 23(f) ("The courts of appeals will
    develop standards for granting review that reflect the
    8
    changing areas of uncertainty in class litigation."). Further,
    as the Committee Note mentions, class certification
    decisions often involve "familiar and almost routine issues"
    that do not necessitate interlocutory appeal. If granting the
    appeal, however, would permit us to address (1) the
    possible case-ending effect of an imprudent class
    certification decision (the decision is likely dispositive of the
    litigation); (2) an erroneous ruling; or (3) facilitate
    development of the law on class certification, then granting
    the motion would be appropriate. But these instances
    should not circumscribe our discretion; there may also be
    other valid reasons for the exercise of interlocutory review.
    Again, we emphasize that the courts of appeals have been
    afforded the authority to grant or deny these petitions "on
    the basis of any consideration that the court of appeals
    finds persuasive."6 Comm. Note, Fed. R. Civ. P. 23(f).
    The claims here touch on several reasons justifying
    interlocutory appeal. On the one hand, some of the
    securities claims pressed by the putative class members
    may be too small to survive as individual claims. On the
    other, certifying the class may place unwarranted or
    hydraulic pressure to settle on defendants. Either way, an
    adverse certification decision will likely have a dispositive
    impact on the course and outcome of the litigation.
    Moreover, this case raises fundamental questions about
    what type of private securities claims merit class
    certification. For these reasons, the motion was properly
    granted.
    III.
    We review a decision granting or denying class
    certification for abuse of discretion. In re LifeUSA Holding
    Inc., 
    242 F.3d 136
    , 143 (3d Cir. 2001); Holmes v. Pension
    Plan of Bethlehem Steel Corp., 
    213 F.3d 124
    , 136 (3d Cir.
    2000). The district court abused its discretion if its decision
    _________________________________________________________________
    6. As set forth in the Note, the district courts"having walked through the
    certification decision, can provide cogent advice on the factors"
    animating their decisions. Comm. Note, Fed. R. Civ. P. 23(f).
    Furthermore, because permission to appeal does not stay trial court
    proceedings, any stay should be sought first from the trial court. 
    Id. 9 "
    `rests upon a clearly erroneous finding of fact, an errant
    conclusion of law or an improper application of law to fact.' "7
    In re General Motors Corp. Pick-Up Truck Fuel Tank Prods.
    Liab. Litig., 
    55 F.3d 768
    , 783 (3d Cir. 1995) (hereinafter
    "G.M. Trucks") (quoting Int'l Union, UAW v. Mack Trucks,
    Inc., 
    820 F.2d 91
    , 95 (3d Cir. 1987)). A class certification
    decision requires a thorough examination of the factual and
    legal allegations. Barnes v. Am. Tobacco Co., 
    161 F.3d 127
    ,
    140 (3d Cir. 1998), cert. denied, 
    526 U.S. 1114
    (1999). For
    this purpose, "it may be necessary for the court to probe
    behind the pleadings before coming to rest on the
    certification question." General Tel. Co. of Southwest v.
    Falcon, 
    457 U.S. 147
    , 160 (1982); see also Amchem Prods.,
    Inc. v. Windsor, 
    521 U.S. 591
    , 634-35 (1997) (Breyer, J.,
    concurring in part and dissenting in part); 7B Wright,
    Miller & Kane, S 1785, p. 16 (West Supp. 2000). "Before
    deciding whether to allow a case to proceed as a class
    _________________________________________________________________
    7. In its amicus brief, the Securities Industry Association contends we
    should be wary of extending class certification to cases where the court
    will in effect set market standards (such as "best execution") and, by
    doing so, affect the certainty of capital markets. Generally, it is
    desirable
    for these types of changes to occur through rule making by the
    appropriate agency. But courts should not hesitate to provide remedies
    for litigants injured by unlawful conduct that may not clearly violate
    regulatory standards. Newton v. Merrill Lynch, Pierce, Fenner & Smith,
    Inc., 
    135 F.3d 266
    , 274 (3d Cir. 1998) (en banc) ("[T]here is no statute,
    rule, regulation, or interpretation, by the SEC or by a court, that
    authoritatively establishes that, for all trades, the NBBO exhausted the
    category of `reasonably available prices' during the class period. This
    absence of precedent did not, however, absolve the district court of the
    duty to resolve the plaintiffs' securities fraud claim once it was
    presented
    in this suit."); see also Deposit Guaranty Nat'l Bank v. Roper, 
    445 U.S. 326
    , 339 (1980) ("The aggregation of individual claims in the context of
    a classwide suit is an evolutionary response to the existence of injuries
    unremedied by the regulatory action of government.").
    Even the Securities and Exchange Commission has argued that "the
    mere fact that the [Securities and Exchange] Commission was
    considering (and has now adopted) rules that prospectively affect . . .
    broker-dealers' order handling obligations would not make it appropriate
    for the court to abstain from deciding whether the defendants committed
    fraud with respect to [their duty of best execution] as it existed during
    the period at issue in this case." Br. of Amicus Curiae the Securities and
    Exchange Commission, at 12 n.14, in Newton, 
    135 F.3d 266
    .
    10
    action, . . . [courts] should make whatever factual and legal
    inquiries are necessary under Rule 23." Szabo v. Bridgeport
    Machs. Inc., 
    249 F.3d 672
    , 676 (7th Cir. 2001); see also 5
    Moore's Federal Practice S 23.46[4] ("[B]ecause the
    determination of a certification request invariably involves
    some examination of factual and legal issues underlying the
    plaintiffs' cause of action, a court may consider the
    substantive elements of the plaintiffs' case in order to
    envision the form that a trial on those issues would take.")
    (footnotes omitted).
    Over twenty-five years ago in Eisen v. Carlisle &
    Jacquelin, the Supreme Court cautioned against going
    beyond the pleadings in class certification decisions. 
    417 U.S. 156
    , 177 (1974) ("[N]othing in either the language or
    history of Rule 23 . . . gives a court any authority to
    conduct a preliminary inquiry into the merits of a suit in
    order to determine whether it may be maintained as a class
    action."). But this admonition must be examined in context.
    At the time, it was ancillary to the principal issue of
    whether Fed. R. Civ. P. 23 required a class representative
    in a securities class action to provide notice to all class
    members. With a claim that amounted to no more than
    seventy dollars, the plaintiff in Eisen sought to shift his
    notice burden to the defendant because providing notice to
    the 2.25 million potential class members was
    extraordinarily costly (roughly $225,000). The district court
    held that the defendant should bear 90% of the cost,
    because the plaintiff was "more than likely" to "prevail on
    his claims." Holding this burden could not be shifted, the
    Supreme Court affirmed the reversal by the court of
    appeals.
    Not long after Eisen, the Court stepped away from this
    bright-line declaration in Coopers & Lybrand v. Livesay,
    when it held that
    [e]valuation of many of the questions entering into
    determination of class action questions is intimately
    involved with the merits of the claims. The typicality of
    the representative's claims or defenses, the adequacy of
    the representative, and the presence of common
    questions of law or fact are obvious examples. The
    more complex determinations required in Rule 23(b)(3)
    11
    class actions entail even greater entanglement with the
    merits . . . .
    
    437 U.S. 463
    , 469 n.12 (1978) (quotation and citation
    omitted). Subsequently, in General Tel. Co. of Southwest v.
    Falcon, the Court appeared to move even further away from
    Eisen, recognizing that
    [s]ometimes the issues are plain enough from the
    pleadings to determine whether the interests of the
    absent parties are fairly encompassed within the
    named plaintiff 's claim, and sometimes it may be
    necessary for the court to probe behind the pleadings
    before coming to rest on the certification question . . . .
    [A]ctual, not presumed conformance with Rule 23(a)
    remains . . . indispensable.
    
    Falcon, 457 U.S. at 160
    . This reasoning applies with equal
    force to certification questions surrounding Fed. R. Civ. P.
    23(b)(3). 
    Szabo, 249 F.3d at 677
    . As the Court concluded in
    Livesay, class certification may require courts to answer
    questions that are often " `enmeshed in the factual and legal
    issues comprising the plaintiff 's cause of action.' 
    " 437 U.S. at 469
    (quoting Mercantile Nat'l Bank v. Langdeau, 
    371 U.S. 555
    , 558 (1963)). To address these questions, courts may
    "delve beyond the pleadings to determine whether the
    requirements for class certification are satisfied." 5 Moore's
    Federal Practice S 23.61[5]; 
    Szabo, 249 F.3d at 677
    (holding
    courts may "look[ ] beneath the surface of a complaint" to
    "make a preliminary inquiry into the merits"); see also
    
    Amchem, 521 U.S. at 615
    (Fed. R. Civ. P. 23(b)(3) invites a
    "close look" before determining class certification); 7B
    Wright, Miller & Kane, S 1785, p.16 (West Supp. 2000)
    (courts not precluded from "necessary inquiry into the
    underlying elements of the case in order to evaluate
    whether Rule 23 has been met"); Moore's Federal Practice,
    Manual For Complex Litigation (Third) S 30.1 ("The decision
    on whether or not to certify a class, therefore, can be as
    important as decisions on the merits of the action and
    should be made only after consideration of all relevant
    evidence and arguments presented by the parties.").
    Since Eisen was decided, the nature of class actions and
    how they are litigated have undergone a sea change.
    12
    Irrespective of the merits, certification decisions may have
    a decisive effect on litigation. As mentioned, if individual
    claims are small, then plaintiffs may not have the incentive
    or resources to pursue their claims if certification is denied
    --sounding the "death knell" to the litigation.8 On the other
    hand, granting certification may generate unwarranted
    pressure to settle nonmeritorious or marginal claims.
    
    Rhone-Poulenc, 51 F.3d at 1299-1300
    (granting order of
    _________________________________________________________________
    8. Trial of plaintiffs' claims here touches on concerns raised by the
    Court
    of Appeals for the Seventh Circuit in In re Rhone-Poulenc Rorer Inc., 
    51 F.3d 1293
    (7th Cir. 1995). In Rhone-Poulenc, the court granted a writ of
    mandamus to reverse the certification of a class of hemophiliacs who
    received blood contaminated with HIV. The class involved only a few
    hundred parties, but each individual had claims possibly worth millions
    of dollars. The court reasoned that the enormous size of the potential
    liability would impose an "intense pressure to settle," 
    id. at 1298,
    because "[t]he risk of facing an all-or-nothing verdict presents too high
    a risk, even when the probability of an adverse judgment is low."
    Castano v. Am. Tobacco Co., 
    84 F.3d 734
    , 746 (5th Cir. 1996) (citing
    
    Rhone-Poulenc, 51 F.3d at 1298
    ). It considered settlements forcibly
    induced by the small probability of an immense judgment "blackmail
    settlements." 
    Rhone-Poulenc, 51 F.3d at 1298
    ; see also 
    Castano, 84 F.3d at 746
    ; G.M. 
    Trucks, 55 F.3d at 784-85
    . Although finding the hydraulic
    pressure to settle should not dispositively affect a certification
    decision,
    the court suggested that it should be balanced against the benefits of a
    class action. 
    Rhone-Poulenc, 51 F.3d at 1299
    ("We do not want to be
    misunderstood as saying that class actions are bad because they place
    pressure on defendants to settle. That pressure is a reality, but it must
    be balanced against the undoubted benefits of the class action that have
    made it an authorized procedure for employment by federal courts."); see
    also Kline v. Coldwell, Banker & Co. 
    508 F.2d 226
    , 238 (9th Cir. 1974)
    ("I doubt that plaintiffs' counsel expect the immense and unmanageable
    case that they seek to create to be tried. What they seek to create will
    become (whether they intend this result or not) an overwhelmingly costly
    and potent engine for the compulsion of settlements, whether just or
    unjust.") (Duniway, J., concurring). The Supreme Court has also
    recognized the dynamic pressure certification sets in motion. The Court
    has observed that "[c]ertification of a large class may so increase the
    defendant's potential damages liability and litigation costs that he may
    find it economically prudent to settle and to abandon a meritorious
    defense." 
    Livesay, 437 U.S. at 476
    . Certifying this class raises a similar
    concern because the size of the class and number of claims may place
    acute and unwarranted pressure on defendants to settle. It is a factor we
    weigh in our certification calculus.
    13
    mandamus to rescind certification based in part on the "the
    demonstrated great likelihood that the plaintiffs' claims,
    despite their human appeal, lack legal merit"); see also G.M.
    
    Trucks, 55 F.3d at 784-85
    (vacating class certification for
    settlement and remanding for further development on the
    record). In a similar vein, the Court of Appeals for the Fifth
    Circuit has concluded that "[g]oing beyond the pleadings is
    necessary, as a court must understand the claims,
    defenses, relevant facts, and applicable substantive law in
    order to make a meaningful determination of the
    certification issues." 
    Castano, 84 F.3d at 744
    (decertifying
    class that sued tobacco manufacturers for nicotine
    addiction). In Castano, the court held that
    a mass tort cannot be properly certified without a prior
    track record of trials from which the district court can
    draw the information necessary to make the
    predominance and superiority analysis required by rule
    23. This is because certification of an immature tort
    results in a higher than normal risk that the class
    action may not be superior to individual adjudication.
    
    Id. at 747.
    Other courts have followed similar approaches.
    
    Szabo, 249 F.3d at 675-78
    ; see also Rutstein v. Avis Rent-A-
    Car Sys., Inc., 
    211 F.3d 1228
    , 1234 (11th Cir. 2000); Hanon
    v. Dataproducts Corp., 
    976 F.2d 497
    , 508-09 (9th Cir.
    1992).
    In reviewing a motion for class certification, a preliminary
    inquiry into the merits is sometimes necessary to determine
    whether the alleged claims can be properly resolved as a
    class action.9 This is such an instance. We must probe
    beyond the surface of plaintiffs' allegations in performing
    our review to assess whether plaintiffs' securities claims
    satisfy Fed. R. Civ. P. 23's requirements.)
    _________________________________________________________________
    9. See Geoffrey C. Hazard, Jr., Class Certification Based on Merits of the
    Claims, 
    69 Tenn. L
    . Rev. (forthcoming Fall 2001).
    14
    IV.
    A.
    This case is before us for the second time. We have
    already provided a succinct description of the facts,
    including the operation of the NASDAQ market and
    defendants' role.10 Newton v. Merrill Lynch, Pierce, Fenner &
    Smith, Inc., 
    135 F.3d 266
    (3d Cir. 1998) (en banc)
    (hereinafter "Newton").
    Plaintiff-Appellants are investors who purchased and
    sold securities on the NASDAQ market, the major
    electronic market for "over-the-counter" securities,
    during the . . . period from November 4, 1992 to
    [August 28, 1996] ("the class period"). The defendants
    are NASDAQ market makers. NASDAQ is a self-
    regulating market owned by the National Association of
    Securities Dealers ("NASD"), subject to oversight by the
    Securities and Exchange Commission ("SEC").
    An "over-the-counter" market like NASDAQ differs in
    important respects from the more familiar auction
    markets, like the New York and American Stock
    Exchanges. The NYSE and AMEX markets are
    distinguished by a physical exchange floor where buy
    and sell orders actually "meet," with prices set by the
    interaction of those orders under the supervision of a
    market "specialist." In a dealer market like NASDAQ,
    the market exists electronically, in the form of a
    communications system which constantly receives and
    reports the prices at which geographically dispersed
    market makers are willing to buy and sell different
    securities. These market makers compete with one
    another to buy and sell the same securities using the
    _________________________________________________________________
    10. The defendants who executed the plaintiffs' orders are Merrill Lynch,
    Pierce, Fenner & Smith, Inc.; Dean Witter Reynolds, Inc.; and
    PaineWebber, Inc. Each defendant is an "integrated broker/dealer"
    brokerage company that executed trades both as an agent and a
    principal. For certification, plaintiffs are divided into three
    subclasses.
    Each subclass consists of all the class members that placed market
    orders with a particular defendant.
    15
    electronic system; NASDAQ is, then, an electronic
    inter-dealer quotation system.
    In a dealer market, market makers create liquidity by
    being continuously willing to buy and sell the security
    in which they are making a market. In this way, an
    individual who wishes to buy or sell a security does not
    have to wait until someone is found who wishes to take
    the opposite side in the desired transaction. To account
    for the effort and risk required to maintain liquidity,
    market makers are allowed to set the prices at which
    they are prepared to buy and sell a particular security;
    the difference between the listed "ask" and"bid" prices
    is the "spread" that market makers capture as
    compensation.
    The electronic quotation system ties together the
    numerous market makers for all over-the-counter
    securities available on NASDAQ. All NASDAQ market
    makers are required to input their bid and offer prices
    to the NASD computer, which collects the information
    and transmits, for each security, the highest bid price
    and lowest ask price currently available. These prices
    are called the "National Best Bid and Offer," or NBBO.
    The NASD computer, publicly available to all NASDAQ
    market makers, brokers and dealers, displays and
    continuously updates the NBBO for each offered
    security.
    Plaintiffs allege that technological advances made it
    feasible during the class period for the defendant
    market makers to execute orders at prices quoted on
    private on-line services like SelectNet and Instinet and
    that those prices were frequently more favorable to
    their investor clients than the NBBO price. According
    to plaintiffs, the defendants regularly used these
    services and knew that prices better than NBBO were
    often available through them. Even though they knew
    that their investor clients expected them to secure the
    best reasonably available price, plaintiffs say, the
    defendants executed plaintiffs' orders at the NBBO
    price when they knew that price was inferior and when
    they, at the same time, were trading at the more
    favorable price for their own accounts. In this way,
    16
    they were able to inflate their own profit margins at the
    expense of their investor clients. This practice is
    alleged to violate section 10 of the Securities
    [Exchange] Act of 1934, 15 U.S.C. S 78j, and Rule 10b-
    5 promulgated thereunder, 17 C.F.R. S 240.10b-5.
    The plaintiffs also charge defendants with two other
    violations of section 10 and Rule 10b-5. Market makers
    who simultaneously hold a market order for both sides
    of a transaction may obtain more favorable prices than
    the NBBO by "crossing" these in-house orders.
    Transactions handled in this way are executed within
    the spread, giving both the purchaser and the seller a
    better price. Similarly, a customer order can be
    matched by a market maker with an in-house limit
    order on the other side of the transaction. Since a limit
    order specifies a particular price at which to execute a
    transaction, matching another customer order at that
    price may beat the currently displayed NBBO quote for
    that security. Plaintiffs allege that the failure of the
    defendants to execute orders of their clients in these
    ways when feasible constitutes a fraudulent practice
    because, by executing at the NBBO rather than
    matching customer orders, the defendants capture the
    full market "spread" as a fee for their services without
    incurring any actual risk in the transaction.11
    
    Newton, 135 F.3d at 268-69
    .12
    Since the initiation of this action, the Securities and
    Exchange Commission has promulgated new rules that
    effectively end the alleged improper practice by the
    defendants. See Order Execution Obligations, Exchange Act.
    Rel. No. 34-37619A, 61 Fed. Reg. 48290, 48306-16, 48322-
    23 (Sept. 12, 1996) ("While in the past quote-based
    _________________________________________________________________
    11. For a more detailed description of the alternative avenues for
    executing trades on the NASDAQ (e.g., Instinet, SelectNet) see the
    district court opinion granting defendants summary judgment, In re
    Merrill Lynch, et al. Sec. Litig., 
    911 F. Supp. 745
    , 759-60 (E.D. Pa.
    1995),
    rev'd, Newton, 
    135 F.3d 266
    .
    12. Defendants' duty to provide best execution remained consistent
    whether they were acting as agents of the trade or principals. 
    Newton, 135 F.3d at 270
    n.1.
    17
    executions in OTC [over the counter] securities were
    generally recognized as satisfying best execution
    obligations, the development of efficient new facilities has
    altered what broker dealers must consider in seeking
    execution of customer orders."); see also 
    Newton, 135 F.3d at 271
    . The new regulations require the NBBO to
    incorporate prices displayed on Instinet and SelectNet as
    well as other sources of liquidity. See 17 C.F.R.
    SS 240.11Ac1-1 to -4 (2000).
    B.
    Defendants initially moved to dismiss this action under
    Fed. R. Civ. P. 12(b)(6) for failure to state a claim upon
    which relief could be granted. At the request of the District
    Court, defendants converted their motion into one for
    summary judgment which was subsequently granted. The
    District Court held that plaintiffs' claims failed to satisfy
    two requirements necessary to maintain a Rule 10b-5
    securities violation--misrepresentation or omission of a
    material fact, and scienter--because defendants'"duty of
    best execution" remained ill-defined during the class period.
    In re Merrill Lynch, et al. Sec. 
    Litig., 911 F. Supp. at 769-71
    .
    Without a clear standard to apply against defendants'
    employment of an industry-wide practice, the court found
    the nondisclosure of their trading execution practice, along
    with their implied representation to obtain best execution,
    did not constitute a misrepresentation or omission of
    material fact. 
    Id. Even if
    the practice constituted a material
    misrepresentation, the district court held defendants had
    not formed the requisite scienter, or intent to deceive,
    because they were not aware their practice actually violated
    the securities laws. 
    Id. at 771-72.
    On appeal, a divided panel of this court affirmed. We
    granted rehearing en banc. The en banc court unanimously
    reversed the district court and remanded, holding the
    execution of trades at the NBBO, albeit the industry
    standard, could still be considered fraudulent behavior
    violating the standards of Rule 10b-5. Newton , 135 F.3d at
    274. Noting this practice could constitute a material
    misrepresentation with scienter when better prices were
    reasonably available, we expressed no opinion on
    18
    defendants' liability, only whether defendants' practice
    could be actionable under Rule 10b-5. 
    Id. at 272-74.
    On
    remand, plaintiffs amended their complaint, extending the
    class period to the time new securities regulations took
    effect outlawing the defendants' alleged tortious practice.
    Plaintiffs then moved for class certification which the
    District Court denied. An interlocutory appeal under Fed.
    R. Civ. P. 23(f) was then granted.
    C.
    Plaintiffs contend defendants' behavior in this case was
    unvarying, alleging it was their established practice to
    execute trades at prices displayed solely on the NBBO
    without investigating other sources. They claim this
    "common scheme" provides a uniform course of unlawful
    conduct well-suited for adjudication as a class action.
    Plaintiffs also argue that during the class period defendants
    capitalized on their access to alternative trading sources to
    find better prices when trading on their own accounts. As
    noted in Newton, an SEC study reported that a "two-tiered
    market" existed during the class period where market
    makers exploited these services to garner better prices for
    themselves while simultaneously denying them to their
    customers.13 
    Id. at 273.
    For their part, defendants argue
    _________________________________________________________________
    13. As noted in Newton, a three month study of prices within the class
    period indicated that "85% of the bids and offers displayed by market
    makers on Instinet and 90% of the bids and offers displayed on
    SelectNet were at better prices than those posted publicly on 
    NASDAQ." 135 F.3d at 272
    (citing Order Execution Obligations, Exchange Act. Rel.
    No. 34-37619A, 61 Fed. Reg. 48290, 48307-08 (Sept. 12, 1996)). These
    apparently incriminating percentages may be mitigated, however, by the
    fact that during a full year of the class period (1993), for example, the
    electronic communication networks (including services like SelectNet and
    Instinet) "accounted for only 13% of share volume in Nasdaq securities
    and only 1.4% of listed share volume." Securities and Exchange
    Commission, Div. of Market Regulation, Electronic Communication
    Networks and After-Hours Trading 6 (June 2000) (citing Market
    2000 Report: Study II, Structure of the U.S. Equity Markets, 1994
    SEC Lexis 133, at *43-44 (Jan. 1994)), available at
    http://www.sec.gov.news/studies/ecnafter.htm. Based on these figures,
    defendants contend plaintiffs' trades could have been executed at
    superior prices from alternative sources only about 30% of the time
    during the class period. See Br. of Appellees at 8 n.7.
    19
    that without examining each transaction, their past ability
    to obtain a better price for a particular trade is purely
    speculative. On appeal, the availability of better prices
    remains hotly contested.
    In this interlocutory appeal, we do not decide whether
    defendants' alleged practice constitutes a Rule 10b-5
    securities violation with respect to each individual member
    of the putative class. Our inquiry only addresses whether
    the federal securities claims alleged by the investors satisfy
    the requirements demanded by Fed. R. Civ. P. 23.
    V.
    To determine whether the claims alleged by the putative
    class meet the requirements for class certification, we must
    first examine the underlying cause of action--in this case,
    a Rule 10b-5 private securities fraud claim. See 
    Barnes, 161 F.3d at 138
    ; McCarthy v. Kleindienst, 
    741 F.2d 1406
    ,
    1412 (D.C. Cir. 1984). This analysis is critical because
    class certification under Fed. R. Civ. P. 23(b)(3) is
    permissible only when "questions of law or fact common to
    the members of the class predominate over any questions
    affecting only individual members." Fed. R. Civ. P. 23(b)(3).
    For the elements of the Rule 10b-5 claim which remain in
    dispute, "[r]equiring proof of individualized reliance [and
    injury] from each member of the proposed plaintiff class
    effectively would . . . prevent[ ] [plaintiffs] from proceeding
    with a class action, since individual issues then would . . .
    overwhelm[ ] the common ones." Basic Inc. v. Levinson, 
    485 U.S. 224
    , 242 (1988). On the other hand, presuming these
    elements would resolve "the problem of balancing the
    substantive requirement of proof of reliance [and injury] in
    securities cases against the procedural requisites of
    [Federal Rule of Civil Procedure] 23." 
    Id. (quotation and
    citation omitted); see also Peil v. Speiser, 
    806 F.2d 1154
    (3d
    Cir. 1986) (upholding presumption of reliance in Rule 10b-
    5 claims based on fraud-on-the-market theory); Hoxworth v.
    Blinder, Robinson & Co., 
    980 F.2d 912
    (3d Cir. 1992)
    (affirming class certification where reliance presumed)
    (hereinafter "Hoxworth II"); William Rubenstein, A
    Transnational Model of Adjudication, 89 Geo. L.J. 371, 391-
    92 (2001) (discussing effect of presuming reliance in
    20
    securities class actions). If proof of the essential elements of
    the cause of action requires individual treatment, then
    class certification is unsuitable. See Binder v. Gillespie, 
    184 F.3d 1059
    , 1063-66 (9th Cir. 1999) (upholding class
    decertification where presumption of reliance and loss
    unavailable), cert. denied, 
    528 U.S. 1154
    (2000).
    Under Rule 10b-5 causation is two-pronged. Huddleston
    v. Herman & MacLean, 
    640 F.2d 534
    , 549 n.24 (5th Cir.
    1981), aff 'd in part, rev'd in part on other grounds, 
    459 U.S. 375
    (1983); see also James D. Cox, Robert W. Hillman &
    Donald C. Langevoort, Securities Regulation: Cases and
    Materials 769-71 (3d ed. 2001); 5 A. Jacobs, The Impact of
    Rule 10b-5 S 64.01[a], at 3-221 to 3-222 (Supp. 1980).
    Reliance, or transaction causation, establishes that but for
    the fraudulent misrepresentation, the investor would not
    have purchased or sold the security. Suez Equity Investors,
    L.P. and SEI Assocs. v. Toronto-Dominion Bank, 
    250 F.3d 87
    , 95-96 (2d Cir. 2001); Weiner v. Quaker Oats Co., 
    129 F.3d 310
    , 315 (3d Cir. 1997); Robbins v. Koger Props., Inc.,
    
    116 F.3d 1441
    , 1447 (11th Cir. 1997). Loss causation
    demonstrates that the fraudulent misrepresentation
    actually caused the loss suffered. Suez Equity 
    Investors, 250 F.3d at 95-96
    ; EP MedSystems, Inc. v. EchoCath, Inc.,
    
    235 F.3d 865
    , 883-84 (3d Cir. 2000). We must first address
    whether plaintiffs' claims are entitled to class-wide
    presumptions of reliance and economic loss before turning
    to the requirements for certification under Fed. R. Civ. P.
    23(b)(3).
    A.
    Section 10(b) of the Securities Exchange Act of 1934
    makes it unlawful "[t]o use or employ, in connection with
    the purchase or sale of any security registered on a
    national securities exchange . . . any manipulative or
    deceptive device or contrivance in contravention of such
    rules and regulations as the [Securities and Exchange]
    Commission may prescribe." 15 U.S.C. S 78j(b). Under this
    statute, the Securities and Exchange Commission
    promulgated Rule 10b-5 which provides:
    It shall be unlawful for any person, directly or
    indirectly, by the use of any means or instrumentality
    21
    of interstate commerce, or of the mails or of any facility
    of any national securities exchange,
    (a) to employ any device, scheme, or artifice to defraud,
    (b) to make any untrue statement of a material fact or
    to omit to state a material fact necessary in order to
    make the statements made, in the light of the
    circumstances under which they were made, not
    misleading, or
    (c) To engage in any act, practice, or course of business
    which operates or would operate as a fraud or deceit
    upon any person, in connection with the purchase or
    sale of any security.
    17 C.F.R. S 240.10b-5. In Newton, we set forth the
    necessary elements of a Rule 10b-5 violation:
    To state a claim for securities fraud under S 10 of the
    Securities [Exchange] Act of 1934 and Rule 10b-5,
    plaintiffs must demonstrate: (1) a misrepresentation or
    omission of a material fact in connection with the
    purchase or sale of a security; (2) scienter on the part
    of the defendant; (3) reliance on the misrepresentation;
    and (4) damage resulting from the misrepresentation.
    
    Newton, 135 F.3d at 269
    ; see also Semerenko v. Cendant
    Corp., 
    223 F.3d 165
    , 174 (3d Cir. 2000).
    It is important to recognize that the facts of this case do
    not resonate with those typical of securities violations
    under Rule 10b-5. Customarily those claims involve a
    fraudulent material misrepresentation or omission that
    affects a security's value. See 
    EchoCath, 235 F.3d at 884
    (citing typical cases: 
    Semerenko, 223 F.3d at 171
    (financial
    statement); 
    Weiner, 129 F.3d at 311-12
    (corporation's
    financial condition); In re Burlington Coat Factory Sec. Litig.,
    
    114 F.3d 1410
    , 1415-17 (3d Cir. 1997) (projected future
    earnings); In re Westinghouse Sec. Litig., 
    90 F.3d 696
    , 700-
    01 (3d Cir. 1996) (fraudulent representation of company's
    state of affairs)).
    The alleged material nondisclosure here consisted of a
    broker-dealer accepting an investor's order under the
    implied representation of the duty of best execution. This
    22
    duty requires a broker-dealer to "use reasonable efforts to
    maximize the economic benefit to the client in each
    transaction." 
    Newton, 135 F.3d at 270
    . A broker-dealer who
    "accepts such an order while intending to breach that duty
    makes a misrepresentation that is material to the purchase
    or sale [of a security]." 
    Id. at 269.
    If the order was executed
    in a manner inconsistent with this duty, it was also
    performed with scienter. 
    Id. at 273-74.
    Despite defendants'
    claim that execution at the NBBO price represented an
    acceptable industry-wide practice, we held in Newton that
    plaintiffs had alleged a claim that at least satisfied Rule
    10b-5's material misrepresentation and scienter
    requirements. 
    Id. at 274-75.
    We did not examine the other
    elements of a Rule 10b-5 claim--specifically, reliance and
    loss causation--because these elements were not relevant
    to the duty of best execution. On remand, the District
    Court picked up where we left off. Although the court found
    no issues affecting misrepresentation and scienter that
    would preclude class certification, it held that individual
    questions on reliance and economic loss presented
    formidable obstacles to class certification.
    The parties disagree whether evidence of reliance and
    economic loss are consistent with each trade or would
    require individual treatment at trial. Defendants argue that
    reliance and economic loss cannot be presumed across the
    class for the hundreds of millions of trades at issue.
    Because only class members who detrimentally relied on a
    defendants' execution practice would have a cause of
    action, they maintain the individual inquiry necessary to
    establish reliance and economic loss renders plaintiffs'
    claims unfit for class certification. Whether proof of reliance
    and economic loss are unique to each investor,
    necessitating a trade-by-trade examination, remains
    contested.
    B. Reliance
    In Rule 10b-5 securities class actions, a plaintiff must
    prove reliance on a fraudulent material misrepresentation
    or omission. Kline v. First W. Gov't Sec., Inc. , 
    24 F.3d 480
    ,
    487 88 (3d Cir. 1994); 
    Peil, 806 F.2d at 1160
    (discussing
    reliance). "It is axiomatic that a private action for securities
    23
    fraud must be dismissed when a plaintiff fails to plead that
    he or she reasonably and justifiably relied on an alleged
    misrepresentation." 
    Semerenko, 223 F.3d at 178
    (citing
    
    Weiner, 129 F.3d at 315
    ; In re Burlington Coat 
    Factory, 114 F.3d at 1417
    ). This burden requires a plaintiff to
    demonstrate that defendants' conduct caused him" `to
    engage in the transaction in question.' " 
    Robbins, 116 F.3d at 1447
    (quoting Currie v. Cayman Res. Corp., 
    835 F.2d 780
    , 785 (11th Cir. 1988)); see also 
    Peil, 806 F.2d at 1160
    .
    "Recognizing that the requirement of showing direct
    reliance presents an unreasonable evidentiary burden in a
    securities market where face-to-face transactions are rare
    and where lawsuits are brought by classes of investors . . .
    this court has adopted a rule that creates a presumption of
    reliance in certain cases." 
    Semerenko, 223 F.3d at 178
    .
    "The reason for shifting the burden on the reliance issue
    has been an assumption that the plaintiff is generally
    incapable of proving that he relied on a material
    [nondisclosure]." Sharp v. Coopers & Lybrand, 
    649 F.2d 175
    , 188 (3d Cir. 1981), overruled in part on other grounds,
    In re Data Access Sys. Sec. Litig., 
    843 F.2d 1537
    (3d
    Cir.1988) (en banc).
    The seminal opinion on the presumption of reliance in
    securities fraud cases is Affiliated Ute Citizens of Utah v.
    United States, 
    406 U.S. 128
    , 153-54 (1970). Affiliated Ute
    involved an effort by some members of the Ute tribe to
    distribute its assets among its members. For this purpose,
    the tribe placed its assets in a corporation and issued each
    member ten shares of stock that were subsequently
    deposited in a local bank. As fiduciary, the bank assumed
    responsibility for enforcing the stocks' restrictions. For its
    own benefit and unknown to the Utes, the bank facilitated
    sales of the stock to outside investors at costs below its fair
    market value. When the Utes discovered the bank's
    practice, they sued under Rule 10b-5. In defense, the bank
    claimed the Utes failed to establish reliance on a
    misrepresentation of material fact. But the Supreme Court
    held the plaintiffs were entitled to a presumption of
    reliance, holding that in cases "involving primarily a failure
    to disclose [material facts], positive proof of reliance is not
    a prerequisite to recovery." 
    Id. at 153.
    Applying this
    precept, we have held that "the proper approach to the
    24
    problem of reliance is to analyze the plaintiff 's allegations,
    in light of the likely proof at trial, and determine the most
    reasonable placement of the burden of proof of reliance."
    
    Sharp, 649 F.2d at 188
    ; see also Joseph v. Wiles, 
    223 F.3d 1155
    , 1162 (10th Cir. 2000) (recognizing that " Affiliated Ute
    presumption of reliance exists in the first place to aid
    plaintiffs when reliance on a negative would be practically
    impossible"); Blackie v. Barrack, 
    524 F.2d 891
    , 907 (9th
    Cir. 1975) (same).
    We extended the Affiliated Ute presumption of reliance to
    investors when securities dealers failed to disclose a pricing
    policy that overcharged investors in the purchase and sale
    of "penny stocks."14 In Hoxworth II, investors alleged they
    were systematically defrauded by a securities dealer's
    failure to disclose its pricing policy of excessive markups or
    markdowns on different securities. 
    980 F.2d 912
    . Because
    of this uniform, material nondisclosure, we concluded that
    the "plaintiffs [were] entitled to the presumption of reliance
    set forth in Affiliated Ute." 
    Id. at 924;
    cf. Eisenberg v.
    Gagnon, 
    766 F.2d 770
    , 786-87 (3d Cir. 1985) (holding
    individual questions of reliance in securities class action
    involving investment in tax shelters did not preclude
    certification). In analogous cases, reliance has not been a
    hurdle to class certification. See Grandon v. Merrill Lynch &
    Co., Inc., 
    147 F.3d 184
    , 190 (2d Cir. 1998) ("A broker-dealer
    commits fraud (in violation of S 10(b) and Rule 10b-5) by
    charging customers excessive markups without proper
    disclosure."); Bank of Lexington & Trust Co. v. Vining-Sparks
    Sec., Inc., 
    959 F.2d 606
    , 613 (6th Cir. 1992) ("[T]he failure
    to disclose exorbitant mark-ups violates section 78j(b) and
    Rule 10b-5."); Angelastro v. Prudential-Bache Sec., Inc., 
    764 F.2d 939
    , 942-46 (3d Cir. 1985) (reliance does not bar
    private securities fraud action involving nondisclosure of
    fraudulent credit terms on margin accounts); Ettinger v.
    Merrill Lynch, Pierce, Fenner & Smith, Inc., 
    122 F.R.D. 177
    ,
    180, 182 (E.D. Pa. 1988) (reliance not an issue in securities
    class action alleging securities dealer failed to disclose
    improper markups on bonds).
    _________________________________________________________________
    14. "Penny stocks are low-priced, high-risk equity securities for which
    there is frequently no well-developed market." Hoxworth 
    II, 980 F.2d at 914
    n.1.
    25
    Investors may also be entitled to a rebuttable
    presumption of reliance under the "fraud-on-the-market
    theory." This is because "in an efficient market the
    misinformation directly affects the stock prices at which the
    investor trades and thus, through the inflated or deflated
    price, causes injury even in the absence of direct reliance."
    In re Burlington Coat 
    Factory, 114 F.3d at 1419
    n.8 (citing
    Basic 
    Inc., 485 U.S. at 241-42
    ). Reliance may be presumed
    when a fraudulent misrepresentation or omission impairs
    the value of a security traded in an efficient market. Basic
    
    Inc., 485 U.S. at 241-42
    ; 
    Semerenko, 223 F.3d at 178
    ; In re
    Burlington Coat 
    Factory, 114 F.3d at 1419
    n.8. Here
    plaintiffs' claims do not involve an omission or
    misrepresentation that affected the value of a security in an
    efficient market. Therefore, a presumption of reliance based
    on this theory would be inappropriate.
    The District Court did not explicitly rule on whether
    reliance could be presumed. Instead the court observed
    that the investors' trades "involved multiple circumstances
    which bear decisively upon the existence of reliance." In re
    Merrill Lynch, et al. Sec. Litig., 
    191 F.R.D. 391
    , 395 (D.N.J.
    1999) (hereinafter "Merrill Lynch"). On this point, the court
    found that some plaintiffs may have known about the
    defendants' practice, belying their argument. 
    Id. ("The degree
    of sophistication of the putative class members
    varies widely. Some, no doubt, were new to the world of
    NASDAQ trading; some were institutional investors.").
    Plaintiffs contend that defendants' uniform practice of
    executing trades at the NBBO price, even if better prices
    were reasonably available from alternative sources, and
    their failure to disclose the practice to their customers
    warrant a presumption of reliance. Defendants respond
    that at least some plaintiffs knew of the execution practice
    which nullifies their reliance. In support, they cite several
    news articles describing the practice15 as well as an SEC
    _________________________________________________________________
    15. See, e.g., Floyd Norris, The S.E.C. Tries to Insure that Investors Get
    Better Stock Prices, N.Y. Times, Sept. 28, 1995, at D8; Daniel Kadlec,
    Young Traders Can Be Gamble for Street, USA Today, Sept. 27, 1995, at
    3B; Warren Getler, Reuter's Instinet is Biting Off Chunks of Nasdaq's
    Territory, Wall St. J., Oct. 4, 1994, at C1; Gretchen Morgenson, Fun and
    Games on Nasdaq, Forbes, Aug. 16, 1993, at 74; Craig Torres, How
    Street Turns Your Stock Trades to Gold, Wall St. J., Feb. 16, 1993, at C1.
    26
    report noting that institutional investors (who fall within
    the putative class's broad definition)16 used alternative
    electronic trading sources to obtain better prices for their
    trades. Br. of Appellees at 56-57. Because some plaintiffs
    knew or should have known of their practice, defendants
    assert that reasonable reliance on the alleged nondisclosure
    did not occur class-wide. For this reason, a presumption of
    reliance is arguably unavailable. See Straub v. Vaisman &
    Co., Inc., 
    540 F.2d 591
    , 595-98 (3d Cir. 1976).
    While it seems apparent that some class members likely
    knew of defendants' practice, this knowledge does not
    necessarily invalidate the presumption. When defendants
    fail to disclose material information about a uniform
    practice involving the purchase or sale of securities,
    plaintiffs may be entitled to a presumption of reliance
    which defendants may rebut. See, e.g., Affiliated 
    Ute, 406 U.S. at 153-54
    ; Hoxworth 
    II, 980 F.2d at 924
    ; 
    Blackie, 524 F.2d at 905-06
    ; see also In re Prudential Ins. Co. of Am.
    Sales Practice Litig., 
    148 F.3d 283
    , 314 (3d Cir. 1998)
    (approvingly noting conclusion that "because plaintiffs'
    fraud-based claims stem largely from misleading omissions,
    reliance can be presumed") (quotation and citation omitted)
    (hereinafter "Prudential"). Presuming reliance class-wide is
    proper when the material nondisclosure is part of a
    common course of conduct.17 Hoxworth 
    II, 980 F.2d at 924
    (holding class entitled to presumption of reliance against
    securities dealer for failure to disclose exorbitant pricing
    _________________________________________________________________
    16. Plaintiffs define the class as consisting"of all persons who placed
    market orders with Merrill Lynch or PaineWebber or Dean Witter to
    purchase or sell shares of OTC stock between November 4, 1992 and
    August 28, 1996."
    17. Further explaining the justification for presuming reliance from
    material nondisclosures, we noted in Sharp that " `[s]ince nothing is
    affirmatively represented in a nondisclosure case, demanding proof of
    reliance would require the plaintiff to demonstrate that he had in mind
    the converse of the omitted facts, which would be virtually impossible to
    demonstrate in most cases.' 
    " 649 F.2d at 188
    n.18 (quoting Note, The
    Reliance Requirement in Private Actions Under SEC Rule 10b-5, 88 Harv.
    L. Rev. 584, 590 (1975) (footnote omitted)). The justifications for
    creating
    presumptions in general are explored in greater depth in 2 J. Strong,
    McCormick on Evidence S 343, p. 437-43 (5th ed. 1999).
    27
    policy for securities); see also 
    Prudential, 148 F.3d at 314
    ;
    
    Ettinger, 122 F.R.D. at 180
    .
    To reiterate, the investors have alleged that the broker-
    dealers failed to disclose their policy of executing NASDAQ
    trades at the NBBO price. Like a securities dealer's failure
    to disclose its policy of overcharging investors, defendants'
    execution of investors' trades at the NBBO price, when
    better prices may have been available from alternative
    services, constitutes a potentially fraudulent common
    course of conduct from which reliance can be presumed.
    See Hoxworth 
    II, 980 F.2d at 924
    (holding plaintiffs entitled
    to presumption of reliance because of defendants'
    nondisclosure of pricing policy);18 see also 
    Prudential, 148 F.3d at 314
    . We will not require each plaintiff to prove he
    relied on a practice which defendants did not affirmatively
    disclose. See 
    Sharp, 649 F.2d at 188
    -89; 
    Ettinger, 122 F.R.D. at 180
    . Because their allegations of a uniform
    nondisclosure would make it impractical for investors to
    affirmatively prove their lack of knowledge of defendants'
    practice, the burden of rebutting a presumption of reliance
    is properly placed on defendants here. Therefore, under this
    set of facts, we hold presuming reliance would be
    appropriate because defendants allegedly failed to disclose
    their trade execution practice.
    C. Economic Loss
    1.
    Under Rule 10b-5, a plaintiff must also establish that he
    suffered an economic loss that was caused by defendant's
    fraudulent conduct. 
    Semerenko, 223 F.3d at 185
    ;
    
    Huddleston, 640 F.2d at 549
    . If economic loss is evident,
    then plaintiff must prove a "sufficient causal nexus between
    the loss and the alleged [nondisclosure]." Semerenko, 223
    _________________________________________________________________
    18. This was based on an earlier decision by our circuit that the "burden
    shifting rationale of Affiliated Ute was fully applicable" to the
    nondisclosure of an exorbitant markup pricing policy. Hoxworth v.
    Blinder, Robinson & Co., Inc., 
    903 F.2d 186
    , 202 (3d Cir. 1990)
    (hereinafter "Hoxworth 
    I"). 28 F.3d at 184
    . Loss causation derives its function from the
    "standard rule of tort law that the plaintiff must allege and
    prove that, but for the defendant's wrongdoing, the plaintiff
    would not have incurred the harm of which he complains."
    Bastian v. Petren Res. Corp., 
    892 F.2d 680
    , 685 (7th Cir.
    1990).
    Initially, loss causation was a requirement established by
    the courts. In re Phillips Petroleum Sec. Litig. , 
    881 F.2d 1236
    , 1244 (3d Cir. 1989) (citing 
    Huddleston, 640 F.2d at 549
    ); 
    Angelastro, 764 F.2d at 942-43
    ; see also 
    Bastian, 892 F.2d at 685
    . But under the Private Securities Litigation
    Reform Act of 1995, it became a statutory element of
    private securities fraud claims under Rule 10b-5. The Act
    provides that "[i]n any private action arising under this
    chapter, the plaintiff shall have the burden of proving that
    the act or omission of the defendant alleged to violate this
    chapter caused the loss for which the plaintiff seeks to
    recover damages." 15 U.S.C. S 78u-4(b)(4).
    In any event, it is necessary here to separate the concept
    of economic loss from the issue of loss causation. Of
    particular importance is whether plaintiffs have, in fact,
    suffered an economic loss. "[F]ailure to show actual
    damages is a fatal defect in a Rule 10b-5 cause of action."
    Feldman v. Pioneer Petroleum, Inc., 
    813 F.2d 296
    , 302 (10th
    Cir. 1987); see also 2 T. Hazen, Law of Securities Regulation
    S 13.7, p. 553 (3d ed. 1995) ("Failure to allege or prove
    actual damages will result in dismissal of any 10b-5
    damage claim."). For this reason, "[i]nvestors cannot
    complain about a fraud that did not cause them any harm."
    Latigo Ventures v. Laventhol & Horwath, 
    876 F.2d 1322
    ,
    1325 (7th Cir. 1989); 
    Huddleston, 640 F.2d at 555
    . The
    economic loss that plaintiffs claim would be the difference
    between the price at which their trades were executed and
    the "better" price allegedly available from an alternative
    trading source.19 Therefore, to show economic loss,
    _________________________________________________________________
    19. The Court of Appeals for the Tenth Circuit has explained how the
    measure of damages should be calculated under Rule 10b-5:
    Although neither Section 10(b) of the [Securities Exchange] Act nor
    Rule 10b-5 contains explicit provisions for determining damages,
    29
    plaintiffs must establish that a "better" price was
    obtainable for each executed trade. If a "better" price was
    unavailable for a particular trade, then a class member
    could not have suffered injury and cannot maintain a Rule
    10b-5 claim.
    2.
    The District Court held that economic loss could neither
    be established nor presumed class-wide. Merrill 
    Lynch, 191 F.R.D. at 397
    . Finding that defendants' practice did not
    detrimentally affect the value of plaintiffs' securities across
    the entire market nor did it necessarily result in
    overcharging, the District Court found no resemblance to
    cases where economic injury naturally flowed from
    defendant's alleged conduct. 
    Id. at 396.
    Irrespective of
    reliance, the District Court found that, after reviewing the
    record, many investors received the best available price
    when defendants executed their trades at the NBBO listed
    price. 
    Id. ("The record
    as it is presently constituted requires
    the conclusion that in a large number of transactions there
    were no better prices from other sources."). Drawing on the
    summary judgment record where it determined from a
    sample analysis of twelve trades executed by defendants
    that only one resulted in actual economic injury to a class
    representative, the District Court concluded that an
    undefined number of class members sustained no economic
    loss whatsoever, necessitating the conclusion that damages
    were not susceptible to class-wide proof.20 
    Id. at 396;
    see
    _________________________________________________________________
    courts have applied the "actual damages" standard of Section 28 of
    the Securities Exchange Act of 1934, 15 U.S.C. Sec. 78bb(a), to
    Rule
    10b-5 claims. Under Section 28 of the Act, the "correct measure of
    damages . . . is the difference between the fair value of all that
    the
    (plaintiff) received and the fair value of what he would have
    received
    had there been no fraudulent conduct." Randall v. Loftsgaarden,
    
    478 U.S. 647
    , 661-62 (1986).
    
    Feldman, 813 F.2d at 301-02
    (footnotes omitted).
    20. In defendants' motion for summary judgment, the District Court
    examined twelve of the class representatives' trades with the defendants
    during the initial class period (November 4, 1992 to November 4, 1994).
    30
    also In re Merrill Lynch et al., Sec. 
    Litig., 911 F. Supp. at 766
    . Based on this reasoning, the District Court found the
    question of economic loss remained unique to each
    investor. Plaintiffs argue against extrapolating the
    improbability of class-wide damages from twelve trades and
    contend the District Court erred in finding that"many"
    _________________________________________________________________
    Although the court's opinion mentions thirteen trades, only twelve were
    evaluated. While the court was provided pricing information from
    SelectNet to compare the prices at which the trades were executed, "[n]o
    information on either Instinet prices, SOES limit order file prices or
    payment for order flow arrangements was supplied for any of the
    transactions." In re Merrill Lynch, et al. Sec. 
    Litig., 911 F. Supp. at 766
    (footnote omitted).
    In the only trade where the District Court found a plaintiff had clearly
    sustained economic injury, plaintiff Binder purchased 1000 shares of
    Optical Radiation through PaineWebber on April 21, 1994. Six minutes
    after receiving the order, PaineWebber executed it at a price of
    $20/share. However, earlier that morning an offer was sent over
    SelectNet that remained open for the entire day to sell 2000 shares of
    Optical Radiation in blocks of 1000 at $19 3/4. Had PaineWebber
    executed the trade at the price offered on SelectNet, the plaintiff would
    have saved $25.
    In two other trades, the court also found inferential and speculative
    evidence that better prices may have been available. On the same day
    that plaintiff Binder placed an order to buy 7000 shares of Hydron
    Technologies at 2 9/16, which PaineWebber executed through a market-
    maker in the security, an offer restricted to Lehman Bros. to sell up to
    3000 shares of Hydron Technologies at 2 1/2 was broadcast on
    SelectNet. Based on this restricted offer, plaintiffs contend the lower
    price indicated a better price for the stock would have been available
    from other sources, potentially Instinet. Additionally, plaintiffs assert
    Merrill Lynch's execution of plaintiff Zakheim's purchase order for 120
    shares of U.S. Healthcare at 42 3/4 was, on average, $0.16/share more
    than the price at which Merrill Lynch executed trades in the stock
    throughout the day. For this reason, plaintiffs reasoned a better price
    was more than likely available on Instinet that day.
    The District Court found SelectNet would not have provided superior
    prices in six other transactions. 
    Id. While no
    information from an
    alternative source was provided for the remaining three transactions, the
    court noted it was still possible that superior prices may have been
    available for them. 
    Id. 31 class
    members were uninjured. But we agree with the
    District Court's finding that plaintiffs' claims would require
    individual treatment to determine actual injury.
    In fraud-on-the-market or overcharging cases that
    warrant a presumption of reliance, plaintiffs satisfy their
    initial burden because they sustain economic loss by
    reason of the alleged conduct.21 In fraud-on-the-market
    cases, the price at which a stock is traded is presumably
    affected by the fraudulent information, thus injuring every
    investor who trades in the security. In re Burlington Coat
    
    Factory, 114 F.3d at 1419
    n.8 (citing Basic 
    Inc., 485 U.S. at 241-42
    ). Nor was economic loss a question in those
    securities claims where defendants failed to disclose a
    fraudulent pricing policy that overcharged investors.
    Accordingly, presuming economic loss was the ineluctable
    _________________________________________________________________
    21. It bears noting that class actions alleging antitrust injury often
    raise
    similar concerns. In antitrust class actions, injury may be presumed
    when it is clear the violation results in harm to the entire class.
    Bogosian
    v. Gulf Oil Corp., 
    561 F.2d 434
    , 454 (3d Cir. 1977); In re Nasdaq Market-
    Makers Antitrust Litig., 
    169 F.R.D. 493
    , 526 (S.D.N.Y. 1996). In Bogosian,
    a class of service station dealers sued their lessors, major oil
    companies,
    for forcing them to purchase gasoline at controlled prices in violation of
    the antitrust laws. 
    561 F.2d 434
    . We recognized that
    when an antitrust violation impacts upon a class of persons . . . ,
    there is no reason why proof of the impact cannot be made on a
    common basis so long as the common proof adequately
    demonstrates some damage to each individual. Whether or not fact
    of damage can be proven on a common basis therefore depends
    upon the circumstances of each case.
    
    Id. at 454.
    Likewise, in In re Nasdaq Market-Makers, a class was certified
    to pursue allegations that market makers of NASDAQ traded securities
    conspired to charge supra-competitive prices on the securities they
    traded for investors. 
    169 F.R.D. 493
    . The court noted that plaintiffs'
    claim of antitrust injury was "susceptible [to] . . . common classwide
    proof [because] . . . an illegal price-fixing scheme presumptively damages
    all purchasers of a price-fixed product in an affected market." 
    Id. at 526.
    Nevertheless, antitrust cases still require proof of injury to each
    individual for common questions to predominate in a class action.
    Windham v. Am. Brands, Inc., 
    565 F.2d 59
    , 65-66 (4th Cir. 1977) (en
    banc); see also Broussard v. Meineke Disc. Muffler Shops, Inc., 
    155 F.3d 331
    , 342-43 (4th Cir. 1998) (citing 
    Windham, 565 F.2d at 66
    ); Kline v.
    Coldwell, Banker & Co., 
    508 F.2d 226
    , 233 (9th Cir. 1974).
    32
    by-product of the alleged fraud. The same does not hold
    true here. The execution of plaintiffs' trades at the NBBO
    listed price did not necessarily injure each class member.
    Plaintiffs may be entitled to a presumption of economic loss
    only when it is clear each class member has in fact
    sustained economic injury. See 
    Semerenko, 223 F.3d at 185
    . In a securities class action, a putative class may
    presumptively establish economic loss on a common basis
    only if the evidence adequately demonstrates some loss to
    each individual plaintiff.
    Because securities claims may take on several forms,
    proving economic loss on a common basis is a fact-specific
    inquiry. See 
    EchoCath, 235 F.3d at 884
    ; 
    Grandon, 147 F.3d at 190
    ; see also 
    Bogosian, 561 F.2d at 454
    (evaluating loss
    in antitrust class actions). We find no support in the case
    law for presuming economic injury for purposes of class
    certification in Rule 10b-5 claims22 absent indication that
    each plaintiff has suffered an economic loss. See
    
    Semerenko, 223 F.3d at 184-85
    ("[W]here the claimed loss
    involves the purchase of a security at a price that is inflated
    due to an alleged misrepresentation, there is a sufficient
    causal nexus between the loss and the alleged
    misrepresentation to satisfy the loss causation
    requirement."); see also 
    Robbins, 116 F.3d at 1448
    ("Our
    decisions explicitly require proof of a causal connection
    between the misrepresentation and the investment's
    subsequent decline in value."); Hayes v. Gross, 
    982 F.2d 104
    , 107 (3d Cir. 1992) (injury assumed when security
    purchased at price inflated by fraudulent
    misrepresentation); Scattergood v. Perelman, 
    945 F.2d 618
    ,
    624 (3d Cir. 1991) (same).
    In assessing the question of economic loss, it is
    important to bear in mind how the facts here differ from
    those in a typical securities action. Unlike a "fraud-on-the-
    market" claim, this case does not involve a
    _________________________________________________________________
    22. The cases on which we rely generally discuss loss causation in the
    context of applying the requirements of a Rule 10b-5 claim, not class
    certification. Many of these cases arise as class actions, but they
    typically involve motions to dismiss for failure to state a claim or
    motions
    for summary judgment rather than class certification.
    33
    misrepresentation or omission that decreased the value of
    a security. Furthermore, unlike excessive over-pricing
    policy claims, this case does not involve a practice that
    necessarily harmed investors across the class.23 See
    generally Grandon, 
    147 F.3d 184
    ; Hoxworth II , 
    980 F.2d 912
    ; Vining-Sparks, 
    959 F.2d 606
    ; Angelastro, 
    764 F.2d 939
    ; Ettinger, 
    122 F.R.D. 177
    . In this case, defendants
    allegedly executed trades solely at the NBBO price.
    Depending on the facts of each trade, the NBBO listed price
    may or may not have provided a class member with the
    best price. Therefore, economic loss to the plaintiffs cannot
    be presumed by the purchase or sale of a security at the
    NBBO price, and we will not presume it across the class.
    In sum, we conclude that the putative class would be
    entitled to a rebuttable presumption of reliance but not of
    economic loss. Therefore, their claims do not warrant a
    rebuttable presumption of class-wide injury.24
    _________________________________________________________________
    23. Plaintiffs also contend that the claims in this case are similar to
    those in Prudential, where we certified a settlement class alleging fraud.
    
    148 F.3d 283
    . The claims here are easily distinguished from the
    securities fraud claims in Prudential. In Prudential, the federal
    securities
    claims involved the sale of vanishing premium life insurance policies
    which the insurance company fraudulently claimed would become self-
    
    funding. 148 F.3d at 300
    (citing In re Prudential Ins. Co. of Am. Sales
    Practices 
    Litig., 962 F. Supp. at 500
    ). By purchasing the policies,
    plaintiffs risked economic injury because the instruments were
    structurally incapable of meeting the financial expectations Prudential
    had promised. Whether or not class members actually suffered economic
    injury was immaterial to the viability of the class's claims because the
    insurance company did not contest liability. See 
    Prudential, 148 F.3d at 296-97
    .
    24. Citing AUSA Life Ins. Co. v. Ernst and Young, 
    206 F.3d 202
    (2d Cir.
    2000), plaintiffs contend that defendants' trading practice established
    loss causation throughout the class because it was foreseeable the
    practice would cause economic harm to class members. 
    See 206 F.3d at 217-20
    (remanding dismissal of securities action for reconsideration of
    loss causation in terms of foreseeability that defendant's conduct would
    have caused alleged economic harm). By focusing on whether or not the
    loss was simply foreseeable, plaintiffs have put an improper gloss on the
    court's opinion. The Court of Appeals for the Second Circuit has
    explained that "loss causation . . . examines how directly . . . [the
    fraudulent conduct] caused the loss, and whether the resulting loss was
    34
    VI.
    Turning to the test for class certification, we must
    examine the elements of a Rule 10b-5 claim through the
    prism of Fed. R. Civ. P. 23 to determine whether the
    District Court abused its discretion in failing to certify the
    class. A putative class must satisfy the four conjunctive
    criteria of Fed. R. Civ. P. 23(a): numerosity, commonality,
    typicality, and adequacy of representation.25 A class seeking
    _________________________________________________________________
    a foreseeable outcome of the fraudulent [conduct]." Suez Equity
    
    Investors, 250 F.3d at 96
    (summarizing the Court of Appeals for the
    Second Circuit's definition of loss causation). Whether or not the loss is
    foreseeable becomes a factor only if direct causation has been
    demonstrated. 
    Id. Our test
    for loss causation is framed somewhat differently. As noted,
    a viable Rule 10b-5 securities claim must show a"sufficient causal
    nexus between the loss and the alleged [nondisclosure]." 
    Semerenko, 223 F.3d at 184
    ; see also In re Phillips Petroleum , 881 F.2d at 1244 (holding
    fraudulent misrepresentation "must touch upon the reasons for the
    investment's decline in value") (citing 
    Huddleston, 640 F.2d at 549
    ). In
    other words, to establish loss causation, a claim must demonstrate that
    the fraudulent conduct proximately caused or substantially contributed
    to causing plaintiff 's economic loss. See 
    EchoCath, 235 F.3d at 883-84
    ;
    
    Semerenko, 223 F.3d at 186
    . Whether there are differences between
    these standards for loss causation, it is far from certain in this case
    that
    each plaintiff has sustained a loss, unlike the insurance companies in
    AUSA.
    In the end, we need not address here whether their claims establish
    loss causation because we find that plaintiffs' claims do not warrant a
    class-wide presumption of economic loss. For those investors who did
    not receive the best available price and suffered a loss as a result,
    establishing loss causation would not be an issue. See Hoxworth 
    I, 903 F.2d at 203
    n.24 (rejecting defendants' argument that excessive markups
    or markdowns may not have been the cause of plaintiffs' injuries).
    25. Fed. R. Civ. P. 23(a) provides:
    Prerequisites to a Class Action. One or more members of a class
    may sue or be sued as representative parties on behalf of all only
    if
    (1) the class is so numerous that joinder of all members is
    impracticable, (2) there are questions of law or fact common to the
    class, (3) the claims or defenses of the representative parties are
    typical of the claims or defenses of the class, and (4) the
    representative parties will fairly and adequately protect the
    interests
    of the class.
    35
    money damages must also satisfy the (b)(3) requirements of
    predominance and superiority--namely, whether common
    questions of law or fact predominate and whether the class
    action represents the superior method for adjudicating the
    case.26
    Denying class certification, the District Court found that
    plaintiffs' claims were atypical and the class representatives
    inadequate to represent the class. On related grounds, the
    court also held that common issues did not predominate
    and the class action device was neither superior nor
    manageable. Merrill 
    Lynch, 191 F.R.D. at 397
    -98. As noted,
    we review the District Court's decision denying class
    certification for abuse of discretion. See supra p. 10.
    A. Federal Rule of Civil Procedure 23(a)
    The certification requirements of Fed. R. Civ. P. 23(a)
    embrace two rudimentary principles: 1) the necessity and
    efficiency of adjudicating the claims as a class and 2) the
    assurance of protecting the interests of absentee members.27
    _________________________________________________________________
    26. Fed. R. Civ. P. 23(b) provides:
    Class Actions Maintainable. An action may be maintained as a
    class action if the prerequisites of subdivision (a) are satisfied,
    and
    in addition:
    * * *
    (3) the court finds that the questions of law or fact common to the
    members of the class predominate over any questions affecting only
    individual members, and that a class action is superior to other
    available methods for the fair and efficient adjudication of the
    controversy. The matters pertinent to the findings include: (A) the
    interest of members of the class in individually controlling the
    prosecution or defense of separate actions; (B) the extent and
    nature
    of any litigation concerning the controversy already commenced by
    or against members of the class; (C) the desirability or
    undesirability
    of concentrating litigation of the claims in the particular forum;
    (D)
    the difficulties likely to be encountered in the management of a
    class action.
    27. We have explained in greater detail that
    [t]he drafters designed the procedural requirements of Rule 23,
    especially the requisites of subsection (a), so that the court can
    36
    Baby Neal v. Casey, 
    43 F.3d 48
    , 55 (3d Cir. 1994); G.M.
    
    Trucks, 55 F.3d at 785
    . If the class does not satisfy each of
    the 23(a) criteria, the suit cannot be maintained as a class
    action. For this reason, we will address each criterion in
    turn.
    1. Numerosity
    Numerosity requires a finding that the putative class is
    "so numerous that joinder of all members is impracticable."
    Fed. R. Civ. P. 23(a)(1). It is clear the size of putative class
    satisfies this criterion. There are hundreds of thousands of
    class members and joinder would be impracticable. Id.;
    Merrill 
    Lynch, 191 F.R.D. at 394
    .
    2. Commonality & Typicality
    " `The concepts of commonality and typicality are broadly
    defined and tend to merge,' " because they focus on similar
    aspects of the alleged claims. 
    Barnes, 161 F.3d at 141
    (quoting Baby 
    Neal, 43 F.3d at 56
    ). Commonality requires
    the presence of "questions of law or fact common to the
    class," Fed. R. Civ. P. 23(a)(2), and typicality demands that
    "the claims or defenses of the representative parties are
    typical of the claims or defenses of the class." Fed. R. Civ.
    P. 23(a)(3). The significance of commonality is self-evident:
    it provides the necessary glue among class members to
    _________________________________________________________________
    assure, to the greatest extent possible, that the actions are
    prosecuted on behalf of the actual class members in a way that
    makes it fair to bind their interests. The rule thus represents a
    measured response to the issues of how the due process rights of
    absentee interests can be protected and how absentees' represented
    status can be reconciled with a litigation system premised on
    traditional bipolar litigation.
    ***
    The Rule 23(a) class inquiries (numerosity, commonality,
    typicality,
    and adequacy of representation) constitute a multipart attempt to
    safeguard the due process rights of absentees. Thus, the ultimate
    focus falls on the appropriateness of the class device to assert
    and
    vindicate class interests.
    G.M. 
    Trucks, 55 F.3d at 785
    , 796.
    37
    make adjudicating the case as a class worthwhile. 1
    Herbert B. Newberg & Alba Conte, Newberg on Class
    Actions S 3.01, p. 3-4 (3d ed. 1992). Typicality ensures the
    interests of the class and the class representatives are
    aligned "so that the latter will work to benefit the entire
    class through the pursuit of their own goals." 
    Barnes, 161 F.3d at 141
    . "The typicality criterion is intended to preclude
    certification of those cases where the legal theories of the
    named plaintiffs potentially conflict with those of the
    absentees by requiring that the common claims are
    comparably central to the claims of the named plaintiffs as
    to the claims of the absentees." Baby Neal , 43 F.3d at 57
    (citing Weiss v. York Hosp., 
    745 F.2d 786
    , 810 (3d Cir.
    1984)).
    We have set a low threshold for satisfying both
    requirements. See 
    Barnes, 162 F.3d at 141
    (noting claims
    based on common course of conduct satisfy typicality); In re
    Sch. Asbestos Litig., 
    789 F.2d 996
    , 1010 (3d Cir. 1986)
    (highlighting that the " `threshold of commonality is not
    high' ") (quoting Jenkins v. Raymark Indus., Inc., 
    782 F.2d 468
    , 472 (5th Cir. 1986)). That is, "Rule 23(a) does not
    require that class members share every factual and legal
    predicate to meet the commonality and typicality
    standards." G.M. 
    Trucks, 55 F.3d at 817
    ." `[N]either of these
    requirements mandates that all putative class members
    share identical claims.' " 
    Prudential, 148 F.3d at 311
    (quoting Baby 
    Neal, 43 F.3d at 56
    ). Nevertheless, we
    require courts to examine them separately because the
    criteria remain distinct. Baby 
    Neal, 43 F.3d at 56
    .
    a. Commonality
    As noted, commonality does not require an identity of
    claims or facts among class members. Prudential , 148 F.3d
    at 310 (citing Baby 
    Neal, 43 F.3d at 56
    )." `The commonality
    requirement will be satisfied if the named plaintiffs share at
    least one question of fact or law with the grievances of the
    prospective class.' " 
    Id. (quoting Baby
    Neal, 43 F.3d at 56
    );
    Georgine v. Amchem Prods., Inc., 
    83 F.3d 610
    , 627 (3d Cir.
    1996), aff 'd sub nom., Amchem Prods., Inc. v. Windsor, 
    521 U.S. 591
    (1997).
    38
    The District Court found, and it is not seriously contested
    on appeal, that common questions of law and fact are
    present. Merrill 
    Lynch, 191 F.R.D. at 394
    . Whether the
    defendants' execution of their customers' trades at prices
    quoted on the NBBO violates Rule 10b-5 constitutes a
    factual and legal claim that is common to the entire class.
    In fact, plaintiffs' claims raise several common issues
    including: 1) did defendants intentionally execute the
    plaintiffs' orders at the NBBO price without examining
    other alternatives; 2) did defendants fail to disclose their
    practice in violation of their duty to their customers; 3)
    were defendants technologically capable of providing
    superior prices to those offered on the NBBO; and 4) did
    defendants' conduct violate S 10(b) of the Securities
    Exchange Act of 1934. See Br. of Appellants at 31. The
    District Court properly held the putative class satisfied this
    requirement.
    b. Typicality
    The typicality inquiry here centers on whether " `the
    named plaintiff[s'] individual circumstances are markedly
    different or . . . the legal theory upon which the claims are
    based differs from that upon which the claims of other
    class members will perforce be based.' " 
    Eisenberg, 766 F.2d at 786
    (quoting 
    Weiss, 745 F.2d at 809
    n.36). The
    criterion acts as a bar to class certification only when "the
    legal theories of the named representatives potentially
    conflict with those of the absentees." 
    Georgine, 83 F.3d at 631
    . If the claims of the named plaintiffs and putative class
    members involve the same conduct by the defendant,
    typicality is established regardless of factual differences.28
    _________________________________________________________________
    28. One treatise describes this standard as met"[w]hen it is alleged that
    the same unlawful conduct was directed at or affected both the named
    plaintiffs and the class sought to be represented." 1 Newberg on Class
    Actions S 3.13, p. 3-77; see also 
    Prudential, 148 F.3d at 311
    (" `Commentators have noted that cases challenging the same unlawful
    conduct which affects both the named plaintiffs and the putative class
    usually satisfy the typicality requirement irrespective of the varying
    fact
    patterns underlying the individual claims.' ") (quoting Baby 
    Neal, 43 F.3d at 58
    ); In re NASDAQ 
    Market-Makers, 169 F.R.D. at 510-11
    ("[The
    typicality requirement is satisfied] where the claims are based on the
    same legal theory and where the class members have allegedly been
    injured by the same course of conduct as that which allegedly injured
    the proposed representatives.").
    39
    
    Barnes, 161 F.3d at 141
    ; see also 1 Newberg on Class
    Actions S 3.15, p. 3-78 ("Factual differences will not render
    a claim atypical if the claim arises from the same event or
    practice or course of conduct that gives rise to the claims
    of the class members, and if it is based on the same legal
    theory."). Our jurisprudence "assures that a claim framed
    as a violative practice can support a class action embracing
    a variety of injuries so long as those injuries can all be
    linked to the practice." Baby 
    Neal, 43 F.3d at 63
    (discussing Falcon, 
    457 U.S. 147
    ). As a result, we have
    concluded that the requirement "does not mandate that all
    putative class members share identical claims," 
    Barnes, 161 F.3d at 141
    , because " `even relatively pronounced
    factual differences will generally not preclude a finding of
    typicality where there is a strong similarity of legal theories'
    or where the claim arises from the same practice or course
    of conduct." 
    Prudential, 148 F.3d at 311
    (quoting Baby
    
    Neal, 43 F.3d at 58
    ); Hoxworth 
    II, 980 F.2d at 923
    .
    The District Court found that the different circumstances
    surrounding each trade over the class period rendered the
    claims of the named representatives "[a]typical of those
    members of the huge class." Merrill 
    Lynch, 191 F.R.D. at 397
    . It reasoned that "[i]f proof of the representatives'
    claims would not necessarily prove all the proposed class
    members['] claims, the representatives['] claims are not
    typical of the proposed members' claims." 
    Id. The District
    Court also believed that individual questions on reliance
    and injury buttressed its finding. 
    Id. But typicality
    does not
    require similarity of individual questions concerning
    reliance or damages on the part of the class representatives
    and class members in a securities fraud action. 
    Blackie, 524 F.2d at 905-06
    . In fact, whether the class
    representatives' claims prove the claims of the entire class
    highlights important issues of individual reliance and
    damages that are more properly considered and relevant
    under the predominance and superiority analysis.
    In Hoxworth II, we found a putative class of securities
    investors, who had purchased or sold excessively marked-
    up securities, satisfied the typicality 
    requirement. 980 F.2d at 923
    . Although the class members may have purchased
    or sold different securities at varying prices, all their claims
    40
    stemmed from defendant's "course of conduct in failing to
    advise purchasers of its excessive markup policy." Id.; see
    also 
    Ettinger, 122 F.R.D. at 180
    -81 (holding typicality
    satisfied where "[p]laintiff 's claims and those of the class
    arise from the same conduct of defendant and are based on
    the same legal theory"). Similarly, in Eisenberg v. Gagnon,
    we held that securities claims involving fraudulent
    inducement to invest in worthless tax shelters satisfied
    typicality. 
    766 F.2d 770
    (3d Cir. 1985). Although the named
    plaintiffs invested in different tax shelters, their
    investments were "prepared by the same defendants, and
    contain[ed] the same alleged omissions and
    misrepresentations." 
    Id. at 786.
    The typicality in their legal
    claims was sufficient to meet this criterion.
    The named plaintiffs here, like the members of the
    putative class, are purchasers and sellers of securities on
    the NASDAQ. They allege that defendants violated their
    duty of best execution by automatically executing each
    investor's trade at prices listed on the NBBO without
    consulting alternative sources that may have provided
    better value. Plaintiffs' claims rest solely on a single legal
    theory--a Rule 10b-5 violation-- and allege a uniform
    course of conduct--automatic execution of their trades at
    the NBBO listed price. Any differences then among class
    members are factual--which security, at what price, under
    what circumstances, etc. The alleged cause of their injuries,
    however, remains typical throughout the class. Because
    each class member "would need to demonstrate the
    existence of this scheme, their interests are sufficiently
    aligned that the class representatives can be expected to
    adequately pursue the interests of the absentee class
    members." 
    Prudential, 148 F.3d at 312
    . The inability of a
    class representative to prove every other class members'
    claim does not necessarily result in failure of the typicality
    requirement. The District Court erred in finding potential
    factual differences rendered plaintiffs' claims atypical.
    3. Adequacy of Representation
    Class representatives must "fairly and adequately protect
    the interests of the class." Fed. R. Civ. P. 23(a)(4). This
    requires a determination of (1) whether the representatives'
    41
    interests conflict with those of the class and (2) whether the
    class attorney is capable of representing the class. 
    Falcon, 457 U.S. at 157
    & n.13; 
    Barnes, 161 F.3d at 141
    . The
    Supreme Court has counseled that this element "serves to
    uncover conflicts of interest between named parties and the
    class they seek to represent." 
    Amchem, 521 U.S. at 625
    . It
    also functions as a catch-all requirement that "tend[s] to
    merge with the commonality and typicality criteria of Rule
    23(a)." 
    Id. at 626
    n.20.29
    After determining economic loss could not be presumed
    class-wide,30 the District Court found the class's
    employment of a statistical formula to calculate and
    allocate damages would create conflicts between plaintiffs
    who were actually injured and uninjured plaintiffs in
    search of a windfall. Merrill 
    Lynch, 191 F.R.D. at 398
    .
    Questioning plaintiffs' ability to resolve this conflict, the
    court refrained from deciding whether the class satisfied
    the adequacy of representation requirement.31
    Following the Supreme Court's observation that adequacy
    of representation is an admixture of commonality and
    typicality, the District Court's reservation appears to be
    _________________________________________________________________
    29. Although in a different context, both the Supreme Court and our
    Court found the potential harm to absentee members of the class
    particularly significant in denying certification in the Amchem
    litigation.
    
    Amchem, 521 U.S. at 626-28
    ("As the Third Circuit pointed out, named
    parties with diverse medical conditions sought to act on behalf of a
    single giant class rather than on behalf of discrete subclasses. In
    significant respects, the interests of those within the single class are
    not
    aligned. Most saliently, for the currently injured, the critical goal is
    generous immediate payments. That goal tugs against the interest of
    exposure-only plaintiffs in ensuring an ample, inflation-protected fund
    for the future."). This concern is not implicated in the case before us.
    30. "Turning to the other elements of a Rule 10b-5 claim, reliance and
    damages, it is evident that common questions of fact do not prevail."
    Merrill 
    Lynch, 191 F.R.D. at 395
    .
    31. Defendants assert that plaintiffs did not properly preserve this issue
    on appeal because it is only mentioned in a footnote in their brief. While
    plaintiffs do not discuss adequacy of representation, they do contest the
    underlying factors motivating the District Court's conclusion. Because
    the issue was present in their opening brief and is implicit in their
    claims, it was sufficiently raised on appeal.
    42
    based on its earlier conclusion that the class did not satisfy
    the typicality requirement. As noted, the District Court's
    typicality concerns reflect inquiries better addressed under
    our review of predominance and superiority. See supra p.
    41. While the commonality and typicality criteria tend to
    merge into an analysis of adequacy of representation under
    Fed. R. Civ. P. 23(a), the standards for measuring the
    predominance of common issues under Fed. R. Civ. P.
    23(b)(3) should not be imputed to adequacy of
    representation.32 That is to say, the reasons for denying
    certification under the predominance standard may not
    necessarily compel denying certification under 23(a)(4),
    because the predominance requirement is more stringent
    than commonality and typicality. See supra note 32. On
    these facts, we hold that counsel would suitably represent
    the class and that there are no foreseeable conflicts
    between the named representatives and the class they seek
    to represent that would bar certification. Therefore, the
    putative class would satisfy the adequacy of representation
    requirement.
    B. Fed. R. Civ. P. 23(b)(3)
    Class certification under Fed. R. Civ. P. 23(b)(3) must
    also satisfy the twin requirements of predominance and
    superiority. The predominance inquiry demands "that
    questions of law or fact common to the members of the
    class predominate over any questions affecting only
    individual members." Fed. R. Civ. P. 23(b)(3). Superiority
    calls for a determination that a class action is the best
    method of achieving a "fair and efficient adjudication of the
    controversy." 
    Id. The Supreme
    Court has explained that
    these elements were adopted
    _________________________________________________________________
    32. We have interpreted the "predominance requirement [as]
    incorporat[ing] the commonality requirement." 
    Georgine, 83 F.3d at 626
    .
    The Supreme Court has also noted that "the predominance requirement
    of Rule 23(b)(3) is similar to the requirement of Rule 23(a)(3) that
    `claims
    or defenses' of the named representatives must be`typical of the claims
    or defenses of the class.' " 
    Amchem, 521 U.S. at 623
    n.18.
    Notwithstanding, the Court has counseled that "the predominance
    requirement is far more demanding [than commonality]." 
    Id. at 623-24.
    43
    to cover cases in which a class action would achieve
    economies of time, effort, and expense, and promote
    . . . uniformity of decision as to persons similarly
    situated, without sacrificing procedural fairness or
    bringing about other undesirable results . . . [which]
    . . . invite[ ] a close look at the case before it is
    accepted as a class action . . . .
    
    Amchem, 521 U.S. at 615
    (internal quotations and citations
    omitted). To assist in this "close look," Fed. R. Civ. P.
    23(b)(3) includes a nonexclusive list of relevant factors:
    (A) the interest of members of the class in individually
    controlling the prosecution or defense of separate
    actions; (B) the extent and nature of any litigation
    concerning the controversy already commenced by or
    against members of the class; (C) the desirability or
    undesirability of concentrating the litigation of the
    claims in the particular forum; (D) the difficulties likely
    to be encountered in the management of a class action.
    Fed. R. Civ. P. 23(b)(3). Simply, "[i]ssues common to the
    class must predominate over individual issues, and the
    class action device must be superior to other means of
    handling the litigation." 
    Prudential, 148 F.3d at 313-14
    .
    1. Predominance
    Predominance measures whether the class is sufficiently
    cohesive to warrant certification. 
    Amchem, 521 U.S. at 623
    .
    Unlike commonality, predominance is significantly more
    demanding, requiring more than a common claim. 
    Id. at 623-24.
    After holding the class was not entitled to a
    presumption of class-wide loss, the District Court found
    that individual questions of whether each class member
    sustained economic injury presented insurmountable
    obstacles to certification. Merrill 
    Lynch, 191 F.R.D. at 396
    -
    97 ("[A]bsent proof of classwide pecuniary loss resulting
    from that reliance, there can be no classwide claim for
    securities fraud."). Examining millions of trades to ascertain
    whether or not there was injury, said the court, meant that
    individual issues overwhelmed common questions among
    the class. 
    Id. at 397-98.
    We agree.
    44
    Because the automated execution of orders at the NBBO
    listed price did not necessarily injure each class member,
    the District Court found that "whether a class member
    suffered damages would have to be determined on a trade
    by trade basis," because "some class members would have
    suffered damages; while some would not." 
    Id. at 396.
    This
    individual inquiry is complicated by several factors.
    Assessing economic injury to a class member would first
    require examining whether a particular trade provided an
    investor with "the best reasonably available price." 
    Newton, 135 F.3d at 270
    . The comparison between the price at
    which a particular trade was executed on the NBBO with
    the prices and trades available at the same time on
    alternative electronic sources would only begin to answer
    this question. As the Newton court recognized:
    [A]scertaining what prices are reasonably available in
    any particular situation may require a factual inquiry
    into all of the surrounding circumstances . . . .
    * * *
    Other terms in addition to price are also relevant to
    best execution. In determining how to execute a client's
    order, a broker-dealer must take into account order
    size, trading characteristics of the security, speed of
    execution, clearing costs, and the cost and difficulty of
    executing an order in a particular market. When the
    plaintiffs state that better "prices" were reasonably
    available from sources other than the NBBO, we
    understand that to mean that, given an evaluation of
    price as well as all of the other relevant terms, the
    trade would be better executed through a source of
    liquidity other than the NBBO (e.g. SelectNet, Instinet,
    in-house limit orders or market orders held by the
    defendants, or limit orders place by the public in the
    Small Order Execution System).
    
    Id. at 270
    & n.2 (internal citations omitted). These factors
    would appear to vary from class member to class member
    and, for each class member, from trade to trade. Whether
    a class member suffered economic loss from a given
    securities transaction would require proof of the
    circumstances surrounding each trade, the available
    45
    alternative prices, and the state of mind of each investor at
    the time the trade was requested. This Herculean task,
    involving hundreds of millions of transactions, counsels
    against finding predominance.
    In an effort to gloss over this requirement, plaintiffs
    suggest their expert could calculate the amount of damages
    each class member sustained thereby removing proof of
    injury as an obstacle to certification. In a sworn
    declaration, plaintiffs' expert provided no model formula,
    but instead projected that he could devise a formula that
    would measure damages among the class and serve as a
    plan for allocation.33 We are not convinced. But even if
    plaintiffs could present a viable formula for calculating
    damages (which they have not), defendants could still
    require individualized proof of economic loss. See, e.g.,
    
    Kline, 508 F.2d at 236
    & n.9.
    The District Court rejected plaintiffs' arguments. Drawing
    guidance from antitrust jurisprudence, the court concluded
    that "[p]roof of damage . . . must be distinguished from the
    mere calculation of damages." Merrill Lynch , 191 F.R.D. at
    396. As the Court of Appeals for the Eighth Circuit
    recognized after reviewing Supreme Court jurisprudence,
    " `an antitrust plaintiff must prove that his damages were
    caused by the unlawful acts of the defendant. . . [before]
    the amount of damages may be determined.' " Amerinet v.
    _________________________________________________________________
    33. On this point, the testimony by plaintiffs' expert was limited to the
    averment that
    based on my work and my familiarity with statistical relationships
    which can be powerfully applied to relevant market data, it is my
    opinion a reliable measure of damages can be developed in this case
    based on the application of well-established statistical
    techniques.
    Based upon an analysis of the types of data set forth in
    Plaintiffs'
    Damage Submission, I can devise a formula which measures class-
    wide damages and from which a plan of allocation can be
    constructed. I will develop the formula using explanatory variables
    that have been widely-used in published studies analyzing
    transaction costs and the bid-asked spread. I will test the formula
    against actual transaction data to make any necessary adjustments.
    The methodology described herein will, in my opinion, yield a
    reliable measure of damages suffered as a result of the practices
    challenged in this lawsuit.
    46
    Xerox Corp., 
    972 F.2d 1483
    , 1494 (8th Cir. 1992) (quoting
    MCI Communications Corp. v. Am. Tel. & Tel. Co., 
    708 F.2d 1081
    , 1161 (7th Cir. 1983)). On this basis, the District
    Court reasoned that
    [c]lass treatment of damages issues, however,
    presumes the ability to prove the fact of damage
    without becoming enmeshed in individual questions of
    actual damage . . . [.] Where proof of fact of damage
    requires evidence concerning individual class members,
    the common questions of fact become subordinate to
    the individual issues, thereby rendering class
    certification problematic.
    Merrill 
    Lynch, 191 F.R.D. at 396
    (quotation and citation
    omitted). Proof of injury (whether or not an injury occurred
    at all) must be distinguished from calculation of damages
    (which determines the actual value of the injury). Even
    assuming plaintiffs' ability to calculate damages, the
    District Could held this did not exempt them from proving
    each class member suffered economic injury. Therefore, the
    court found that determining actual economic loss on the
    part of each investor would involve individual questions
    that predominate over common ones.
    The District Court's analogy to antitrust class actions is
    well-taken. In a Rule 10b-5 securities claim that"impacts
    upon a class of persons . . . there is no reason . .. why
    proof of the impact cannot be made on a common basis so
    long as the common proof adequately demonstrates some
    damage to each individual." 
    Bogosian, 561 F.2d at 454
    (discussing injury in antitrust cases). The ability to
    calculate the aggregate amount of damages does not
    absolve plaintiffs from the duty to prove each investor was
    harmed by the defendants' practice. In class actions based
    on a "fraud-on-the-market," an excessive pricing policy for
    securities, or an antitrust violation, the alleged conduct
    itself causes economic injury. But only those class
    members whose trades could have been executed at better
    prices sustained economic injury here. Determining which
    class members were economically harmed would require an
    individual analysis into each trade and its alternatives. The
    individual questions, therefore, are overpowering. As we
    held in Georgine:
    47
    Even if we were to assume that some issues common
    to the class beyond the essentially settled question of
    the harmfulness of asbestos exposure remain, the huge
    number of important individualized issues overwhelm
    any common questions. Given the multiplicity of
    individualized factual and legal issues, . . . we can by
    no means conclude that the questions of law or fact
    common to the members of the class predominate over
    any questions affecting only individual 
    members. 83 F.3d at 630
    (internal quotes omitted); Barnes , 161 F.3d
    at 146 ("Because nicotine addiction must be determined on
    an individual basis and remains an essential part of
    plaintiffs' . . . claim . . . class treatment is inappropriate.").
    While obstacles to calculating damages may not preclude
    class certification, the putative class must first demonstrate
    economic loss on a common basis. As noted, the issue is
    not the calculation of damages but whether or not class
    members have any claims at all.
    The District Court was also guided by our decision in
    Georgine. Merrill 
    Lynch, 191 F.R.D. at 396
    ("Although in
    Georgine, as in the present case, there were several
    common questions, the Court held that class treatment was
    inappropriate because `each individual plaintiff 's claim
    raises radically different factual and legal issues from those
    of other plaintiffs . . . [.] In such circumstances, the
    predominance requirement of Rule 23(b)(3) cannot be
    met.' ") (quoting 
    Georgine, 83 F.3d at 618
    ). In Amchem, the
    Supreme Court affirmed our determination that a
    settlement class of individuals exposed to asbestos
    products failed the predominance prong because of
    significant individual issues surrounding each claim. The
    plaintiffs had been exposed to "different asbestos containing
    products, for different amounts of time, in different ways,
    and over different periods." 
    Georgine, 83 F.3d at 626
    . There
    were also different classes of plaintiffs--some who were
    presently injured and some who had been exposed but
    whose future injury remained speculative. 
    Id. The individualized
    differences as to amount of asbestos
    exposure and future injury were significant because they
    would "lead to disparate applications of legal rules,
    including matters of causation, comparative fault, and the
    48
    types of damages available to each plaintiff." 
    Id. at 627.
    For
    these reasons, the constellation of individual issues
    eclipsed common questions.
    Citing the Supreme Court's guidance that
    "[p]redominance is a test readily met in certain cases
    alleging consumer or securities fraud or violations of the
    antitrust laws," 
    Amchem, 521 U.S. at 625
    (citing Comm.
    Note, Fed. R. Civ. P. 23), plaintiffs contend Amchem, a mass
    tort action, may be distinguished, and argue that individual
    economic injury need not be factored into the
    predominance calculus. See Hoxworth 
    II, 980 F.2d at 924
    (holding that "uniform scheme to defraud investors in the
    class securities . . . would support class action treatment");
    
    Ettinger, 122 F.R.D. at 182
    (common question of exorbitant
    markups on securities predominates over individual
    damage calculations).
    Although the securities claims are unlike the mass tort
    claims in Amchem, the obstacles to satisfying the
    predominance requirement are comparable. In Amchem, the
    Court found that individual questions on the varying
    degrees and effects of asbestos exposure overpowered
    common ones. The breadth of the claims here may be
    different from Amchem, but the sheer number of claims
    raising individual questions of injury is strikingly similar.
    In Georgine, we recognized "individualized issues can
    become overwhelming in actions involving long-term mass
    torts (i.e., those which do not rise out of a single 
    accident)." 161 F.3d at 628
    . The alleged injuries in Newton arise out of
    the execution of hundreds of millions of trades, not a single
    act of fraudulent conduct. The distinct facts among the
    hundreds of thousands of plaintiffs involving hundreds of
    millions of trades will determine whether securities
    violations occurred. Because plaintiffs' claims will require
    an economic injury determination for each trade, we hold
    the putative class fails to satisfy the predominance
    requirement.
    Moreover, as we have noted in securities cases involving
    fraud-on-the-market or excessive markups, injury
    necessarily flowed from defendant's conduct and reliance
    and injury could be presumed. In those cases, if
    defendant's conduct was held fraudulent, a claim of loss
    49
    naturally followed. Here it remains contested whether
    defendants' conduct in each trade was fraudulent as well as
    whether the investors suffered a loss as a result. Because
    it is clear that at least some of the plaintiffs have not
    suffered economic injury, individual questions remain that
    would have to be adjudicated separately. For these reasons,
    we hold this case does not fall within the scope of those
    "certain cases alleging . . . securities fraud," 
    Amchem, 521 U.S. at 625
    (emphasis supplied), in which predominance
    may be readily established.34
    Because economic loss cannot be presumed, ascertaining
    which class members have sustained injury means
    individual issues predominate over common ones.
    Therefore, the District Court exercised its sound discretion
    _________________________________________________________________
    34. In the alternative, the putative class argues that under Prudential,
    
    148 F.3d 283
    , the predominance inquiry will not be undermined if each
    class member has not suffered economic injury. Br. of Appellants at 47-
    49. But plaintiffs' reliance on Prudential is misplaced. First, the lion's
    share of the fraud claims in Prudential were largely unrelated to federal
    securities law. 
    Prudential, 148 F.3d at 314
    . In describing the claims, the
    district court observed:
    [M]ost of the plaintiffs' claims [did] not even involve a reliance
    element. Plaintiffs' claims for breach of contract, breach of
    implied
    obligation of good faith and fair dealing, negligence, negligent
    training and supervision, and unjust enrichment do not involve
    reliance. An individual issue with respect to one element of a
    small
    portion of plaintiffs' claims does not outweigh the multitude of
    issues common to the remaining elements and claims.
    In re Prudential Ins. Co. of Am. Sales Practice 
    Litig., 962 F. Supp. at 516
    .
    The claims in this appeal fall squarely under Rule 10b-5. Second,
    plaintiffs note that the class in Prudential contained "both injured and
    uninjured policyholders" without barring 
    certification. 148 F.3d at 306
    .
    Based on this, plaintiffs contend that even if some class members did
    not suffer economic loss, class certification should not be prohibited in
    this case either. We disagree. In Prudential, the presence of injured and
    uninjured class members was evaluated in the context of standing, not
    class certification. 
    Id. at 306-07.
    But satisfaction of constitutional
    standing does not answer the predominance inquiry. Furthermore, there
    was no dispute over the individual question of economic loss in
    Prudential because the defendant insurance company did not contest
    liability and waived all defenses. See 
    Prudential, 148 F.3d at 296-97
    .
    50
    in finding the putative class did not satisfy the
    predominance requirement.
    2. Superiority
    Even if reliance and damages could be presumed or
    determined in separate proceedings after certification, this
    action fails to satisfy Fed. R. Civ. P. 23(b)(3)'s superiority
    requirement.
    A class action must represent the best "available
    method[ ] for the fair and efficient adjudication of the
    controversy." Fed. R. Civ. P. 23(b)(3). Here we must address
    "the difficulties likely to be encountered in the management
    of a class action." Fed. R. Civ. P. 23(b)(3)(D). According to
    the District Court, the need for individualized inquiry into
    actual injury transformed the "[e]xploration of each and
    every customer's NASDAQ transactions with defendants
    during the period from November 4, 1992 to August 28,
    1996 [into] a mind-boggling undertaking." Merrill 
    Lynch, 191 F.R.D. at 398
    . We agree. With hundreds of millions of
    trades, it is difficult to imagine how this case can be tried.35
    Contending each individual claim is so small that only a
    class action will provide a remedy, plaintiffs maintain that
    _________________________________________________________________
    35. Defendants contend that plaintiffs have not preserved this issue on
    appeal because they did not address superiority in their initial brief.
    See
    Br. of Appellees at 69. The plaintiffs' waiver of a dispositive issue,
    they
    argue, provides sufficient grounds for affirming the District Court. See
    Nagle v. Alspach, 
    8 F.3d 141
    , 143-44 (3d Cir. 1993) (holding issues to be
    appealed must appear in briefing to be preserved). Although the plaintiffs
    do not address superiority directly in their brief, they raise the issue
    specifically in their reply brief, and the facts and arguments on
    superiority are present throughout their brief. We have concluded that
    " `[a]n issue is waived unless a party raises it in its opening brief.' "
    Reform Party of Allegheny County v. Allegheny County Dept. of Elections,
    
    174 F.3d 305
    , 316 n.11 (3d Cir. 1999) (quoting Laborers' Int'l Union of
    N. Am. v. Foster Wheeler Corp., 
    26 F.3d 375
    , 398 (3d Cir. 1994)). We also
    reasoned that "absent extraordinary circumstances, briefs must contain
    statements of all issues presented for appeal, together with supporting
    arguments and citations." Simmons v. City of Philadelphia, 
    947 F.2d 1042
    , 1065 (3d Cir. 1991). But we believe the issue of superiority was
    implicit in the plaintiffs' opening brief and was adequately raised on
    appeal.
    51
    denying certification will absolve defendants from
    wrongdoing. The District Court rejected this rationale as a
    "basis for excusing plaintiffs from proving the essential
    elements of their cause of action." Merrill 
    Lynch, 191 F.R.D. at 398
    . We agree. Recently we held this factor "by itself is
    insufficient to overcome the hurdles of predominance and
    superiority and efficient and fair management of a trial,
    which Rule 23(b) requires." In re LifeUSA Holding 
    Inc., 242 F.3d at 148
    n.13. We also recognize that some class
    members, such as large institutional investors who fall
    within the class definition, arguably would have a
    significant financial stake to raise stand-alone claims.
    Turning to manageability, the District Court's evaluation
    must be "granted a wide range of discretion." Link v.
    Mercedes Benz of N. Am., Inc., 
    550 F.2d 860
    , 864 (3d Cir.
    1977). "Manageability is a practical problem, one with
    which a district court generally has a greater degree of
    expertise and familiarity than does the appellate court." In
    re Sch. Asbestos 
    Litig., 789 F.2d at 1011
    . It encompasses
    "the whole range of practical problems that may render the
    class action format inappropriate for a particular suit."
    
    Eisen, 417 U.S. at 164
    .
    Here there are hundreds of millions of transactions
    executed over several years. Plaintiffs maintain their expert
    can devise a formula for calculating injury and damages
    that will allay manageability concerns. Yet we are hesitant
    to rely on a formulaic nostrum given the consequences if it
    fails to meet expectations. See 
    Windham, 565 F.2d at 70
    ("But where the court finds, on the basis of substantial
    evidence as here, that there are serious problems now
    appearing, it should not certify the class merely on the
    assurance of counsel that some solution will be found."). As
    noted, actual injury cannot be presumed, and defendants
    have the right to raise individual defenses against each
    class member. See In re Sch. Asbestos 
    Litig., 789 F.2d at 1011
    ("The potential for individual defenses . . . clearly
    poses significant case management concerns."). We hold
    that establishing proof of the plaintiffs' injuries and
    litigating the defenses available to the defendants would
    present insurmountable manageability problems for the
    District Court.
    52
    The superiority requirement also casts serious doubt on
    the efficiency and manageability of certifying this class for
    trial. "In terms of efficiency, a class of this magnitude and
    complexity could not be tried. There are simply too many
    uncommon issues, and the number of class members is
    surely too large. Considered as a litigation class, then, the
    difficulties likely to be encountered in the management of
    this action are insurmountable." 
    Georgine, 83 F.3d at 632
    -
    33.36 Although plaintiffs attempt to fit this case under
    Prudential, that case raised different issues because the
    class was certified for the purpose of settlement. This is
    significant because "the settlement approval inquiry is far
    different from the certification inquiry. In settlement
    situations, the superiority requirement arguably translates
    into the question whether the settlement is a more
    desirable outcome for the class than individualized
    litigation, and may assure that the settlement has not
    grossly undervalued plaintiffs' interests." G.M. 
    Trucks, 55 F.3d at 796
    . Significantly, in Prudential we did not have to
    "inquire whether the case, if tried, would present
    intractable management problems . . . for the proposal
    [was] that there be no trial." Amchem , 521 U.S. at 620.
    Additionally we have recognized that adjudicating Rule 10b-
    5 securities claims as a class action satisfies superiority
    only if the litigation results in fewer individual actions.
    Because injury determinations must be made on an
    individual basis in this case, adjudicating the claims as a
    class will not reduce litigation or save scarce judicial
    resources. Under these circumstances, plaintiffs fail to
    satisfy the superiority standard. See G.M. 
    Trucks, 55 F.3d at 783
    ("One of the paramount values in [class actions] is
    efficiency. Class certification enables courts to treat
    common claims together, obviating the need for repeated
    adjudications on the same issue.").
    We are also mindful that Amchem and Prudential involved
    mature claims. The class settlements were the result of
    verdicts on established liability and damages awards. This
    case does not share a similar track record. Of course, many
    _________________________________________________________________
    36. Of course, one of the central concerns behind denying certification in
    Georgine was the potential harm to absentee members. This is not a
    factor here.
    53
    securities fraud claims do not generally implicate maturity
    concerns because they do not raise complex issues of
    causation and injury. Furthermore, the divergent outcomes
    in Amchem and Prudential make it clear that maturity alone
    is neither necessary nor sufficient for certification, but it
    may help to ensure that class certification is "superior to
    individual adjudication." 
    Castano, 84 F.3d at 747
    .
    The specter of adjudicating plaintiffs' claims at trial is, at
    the very least, daunting. Individual questions of economic
    loss present insurmountable manageability problems.
    Moreover, class certification would place hydraulic pressure
    on defendants to settle which weighs in the superiority
    analysis. See supra note 8. At trial, determining actual
    injury would require hundreds of millions of individual
    assessments. For these reasons, the District Court was
    clearly within its sound discretion to hold this case failed to
    satisfy the superiority requirement.
    VII.
    In sum, although the putative class satisfies the
    requirements of Fed. R. Civ. P. 23(a), it cannot meet the
    requirements of Fed. R. Civ. P. 23(b)(3). In particular, the
    investors' claims fail the predominance and superiority
    requirements under Fed. R. Civ. P. 23(b)(3). For these
    reasons, we will affirm the judgment of the District Court.
    A True Copy:
    Teste:
    Clerk of the United States Court of Appeals
    for the Third Circuit
    54
    

Document Info

Docket Number: 00-1586

Citation Numbers: 259 F.3d 154

Filed Date: 8/6/2001

Precedential Status: Precedential

Modified Date: 1/12/2023

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