Reynaldo Reyes v. Netdeposit , 802 F.3d 469 ( 2015 )


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  •                                           PRECEDENTIAL
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    _____________
    No. 14-1228
    _____________
    REYNALDO REYES,
    on behalf of himself and all others similarly situated,
    Appellant
    v.
    NETDEPOSIT, LLC; MP TECHNOLOGIES d/b/a Modern
    Payments; TELEDRAFT, INC.; NATIONAL PENN BANK;
    WELLS FARGO BANK, N.A.; WACHOVIA BANK, N.A.;
    ZIONS FIRST NATIONAL BANK
    ________________
    APPEAL FROM THE UNITED STATES DISTRICT
    COURT FOR THE EASTERN DISTRICT OF
    PENNSYLVANIA
    (D.C. No. 2-10-cv-00345)
    District Judge: Honorable Juan R. Sánchez
    ________________
    Argued
    September 11, 2014
    ____________
    Before: MCKEE, Chief Judge, SMITH and SHWARTZ,
    Circuit Judges
    (Opinion Filed: September 2, 2015)
    ______________
    Howard I. Langer, Esq. (ARGUED)
    John J. Grogan, Esq.
    Edward Diver, Esq.
    Irv Ackelsberg, Esq.
    1
    Peter E. Leckman, Esq.
    LANGER, GROGAN & DIVER, P.C.
    1717 Arch Street, Suite 4130
    Philadelphia, PA 19103
    Attorneys for Appellant
    Jason A. Snyderman, Esq. (ARGUED)
    Grant S. Palmer, Esq.
    William R. Cruse, Esq.
    Bridget E. Mayer, Esq.
    Blank Rome LLC
    One Logan Square
    Philadelphia, PA 19103
    Attorneys for Appellees
    Charles L. Becker, Esq. (ARGUED)
    Kline & Specter, PC
    1525 Locust Street, 19th Floor
    Philadelphia, PA 19102
    Attorney for Amici Curiae
    Public Interest Law Center of Philadelphia and
    Community Legal Services
    Julie Nepveu, Esq.
    AARP Foundation Litigation
    Room B4-245
    601 E Street, N.W.
    Washington, DC 20049
    Attorney for Amici Curiae AARP, National
    Association of Consumer Advocates, National
    Consumer Law Center and Consumer Federation of
    America
    Richard B. Tucker, III, Esq.
    Tucker Arensberg
    1500 One PPG Place
    Pittsburgh, PA 15222
    Attorney for Amici Curiae American Bankers
    2
    Association and Independent Community Bankers of
    America
    Robert J. LaRocca, Esq.
    Kohn, Swift & Graf
    One South Broad Street
    Suite 2100
    Philadelphia, PA 19107
    Attorney for Amici Curiae Richard Blumenthal,
    Robert Casey, Edward J. Markey and Allyson Y. Schwartz
    Francis X. Riley, III, Esq.
    Charles M. Rowan, Jr., Esq.
    Saul Ewing
    650 College Road East
    Suite 100
    Princeton, NJ 08540
    Attorney for Amicus Curiae Risk Management
    Association
    ______________
    OPINION OF THE COURT
    ______________
    McKEE, Chief Judge.
    Reynaldo Reyes appeals the District Court’s denial of
    his motion to certify a class to sue for alleged civil violations
    of the Racketeer Influenced and Corrupt Organizations Act
    (“RICO”), 18 U.S.C. §§ 1962(c), (d). The defendants are
    Zions First National Bank (“Zions Bank”) and its payment-
    processor subsidiaries, Netdeposit, LLC and MP
    Technologies (together, “Modern Payments”).
    Reyes alleges that the defendants conspired to conduct
    a fraudulent telemarketing scheme that caused unauthorized
    debits from bank accounts owned by himself and members of
    the proposed class.
    3
    The District Court held that class certification was
    inappropriate because there were no issues common to the
    class and Reyes could therefore satisfy neither the
    commonality requirement of Federal Rule of Civil Procedure
    23(a), nor the predominance requirement of Rule 23(b)(3).
    This interlocutory appeal followed.1
    I.     BACKGROUND
    Reyes alleges that the defendants conspired to conduct
    a fraudulent scheme whereby certain telemarketing firms
    would contact unsuspecting individuals and offer them
    something of little or no value. Reyes alleges that, during
    unsolicited phone calls with unsuspecting consumers, the
    telemarketers would obtain bank account information which
    was used to make unauthorized debits from the the
    consumers’ bank accounts.2 In Reyes’ case, in an unsolicited
    phone call in November 2007, telemarketer NHS Systems
    told Reyes that he qualified for a free government grant.
    NHS Systems then requested Reyes’ bank account
    information, which he provided.
    Telemarketers such as NHS Systems cannot readily
    obtain funds directly from consumers’ bank accounts because
    most banks are extremely reluctant to allow them to debit
    accounts. Accordingly, telemarketers usually contract with
    payment processing entities that debit bank accounts on the
    1
    See 28 U.S.C. § 1292(e); Fed. R. Civ. P. 23(f). The
    District Court also granted various amici curiae leave to file
    briefs in support of Reyes’ motion for class certification.
    2
    Reyes alleges that, besides phone-based marketing,
    the scheme included deceptive mailers, Internet solicitation,
    and “slamming,” a process whereby a telemarketer acquires a
    consumer’s bank account information from another entity and
    either contacts the consumer under the pretense of attempting
    to verify the information or simply transfers money from the
    consumer’s account. JA 513-15.
    Because Reyes alleges that the merchants operated in
    the same way and as part of a fraudulent enterprise, Appellant
    Br. at 18, we refer to all of them as “telemarketers” for the
    sake of simplicity.
    4
    telemarketer’s behalf. In Reyes’ case, NHS Systems did
    exactly that. It provided Reyes’ bank account information to
    Modern Payments, a third-party payment processing agency
    and subsidiary of Zions Bank. Modern Payments then caused
    Zions Bank to initiate an Automated Clearing House
    (“ACH”) debit of Reyes’ bank account at Commerce Bank.
    Pursuant to Zions Bank’s request, Reyes’ funds on deposit
    with Commerce Bank were transferred to Modern Payments’
    account at Zions Bank, and ultimately transferred to NHS
    Systems, the Originator. Two debits were processed from
    Reyes’ account using this ACH debit process, one for $29.95
    and another for $299.95.3 Reyes v. Zions First Nat’l Bank, ---
    F. Supp. 2d ---, Civ. Action No. 10-345, 
    2013 WL 5332107
    ,
    at *1 (E.D. Pa. Sept. 23, 2013).
    The ACH debit process is an alternative to traditional
    checking which is based on the transfer of paper instruments.
    When an ACH transfer occurs, an Originating Depository
    Financial Institution, like Zions Bank, initiates an ACH entry
    at the request of an Originator (such as NHS Systems). Such
    requests can also be made through third parties at the request
    of the Originator. As we have just explained, Reyes alleges
    that Modern Payments caused Zions Bank to take ACH debits
    from bank accounts owned by him and other members of the
    putative class at the request of the telemarketers, like NHS
    Systems.
    The Originating Depository Financial Institution (here,
    Zions Bank) aggregates payments from customers and
    transmits the payments in batches to an ACH Operator (either
    the Federal Reserve or the Clearing House). The Operator
    receives and sorts the batched payments and makes the funds
    available to the Receiving Depository Financial Institution.
    That institution, in turn, debits or credits the relevant account
    based on the ACH entry. Here, Reyes alleges that Modern
    3
    Although many (if not all) of the debits involved in
    this appeal are sufficiently small to be considered de minimis
    by some, the cumulative amount is substantial. In fact, the
    conduct alleged here has attracted the attention of the
    impressive array of amici who have filed briefs in this matter,
    including the AARP, four members of the United States
    Congress, and the American Bankers Association.
    5
    Payments credited the accounts of each of the telemarketers
    in the amount of funds fraudulently debited from
    unsuspecting victims. Both Modern Payments, as payment
    processor, and Zions Bank, as the processor’s bank, would
    have collected a fee and then deposited the balance of
    amounts debited from consumers directly into the account of
    the telemarketer.4
    Reyes alleges that his bank account and the accounts
    of other consumers subjected to this fraudulent enterprise did
    not have sufficient funds to satisfy many of the unauthorized
    debits.5 Reyes called NHS Systems to complain about the
    two withdrawals from his account, but he alleges NHS
    Systems provided him with a misleading audio recording.6
    Thereafter, Reyes initiated this action on behalf of
    himself and a class of all individuals in the United States as to
    whom ACH debit entries or [remotely created check] drafts
    on their accounts were prepared by defendants Netdeposit,
    Modern Payments, or Teledraft during the four-year period
    immediately preceding the filing of this action and finally
    charged to the class members’ bank accounts by a
    Telemarketer, or pursuant to information provided to
    defendants [Netdeposit, Modern Payments, or Teledraft] by
    4
    Though this sounds cumbersome, it is nothing more
    than a series of computer entries or lines of computer code;
    the entire series of transactions can easily be completed, and
    the funds transferred and received, in one to two business
    days.
    5
    It is not difficult to understand why the accounts did
    not have a sufficient balance to pay the amount of the
    attempted debits. If the depositors had never authorized the
    debits, they would have had no way of knowing that the
    balance in their accounts was not sufficient to satisfy the
    amounts of the attempted withdrawals and no reason to take
    steps to ensure that their balances were sufficient to cover
    those debits.
    6
    According to NHS Systems, the recording
    established that Reyes consented to the disputed debits.
    6
    the Telemarketers, or who otherwise incurred any bank
    charges as a consequence of such ACH debit entries or
    [remotely-created checks].
    JA 526 ¶ 63.
    The legal theory underlying this suit is that the
    defendants were operating a RICO enterprise that was a total
    sham.7 The proof that Reyes offers to support that claim
    includes the inordinately high “return rates” of the
    telemarketers who did business with Modern Payments and
    Zions Bank. “Return rates” refer to how often an ACH debit
    cannot be completed. There are many reasons why a
    transaction may not be completed. These include (but are not
    limited to) insufficient funds or a customer complaint
    regarding the transaction. These complaints can result in the
    debited funds being credited back to the consumer’s bank
    account. Return rates are collected by NACHA (previously
    known as the “National Automated Clearing House
    Association”), a not-for-profit association that administers
    and manages the ACH Network and other electronic
    transactions.
    Reyes stresses that “the lowest return rate at issue
    [here] was 25 times the national average of 1.25%.”
    Appellant Br. at 26 (emphasis in original). Moreover, that
    was the telemarketer with the lowest rate. As Reyes notes, he
    produced testimony that “[m]ost were over 50 times that
    average.” 
    Id. at 25-26
    (citing JA 661, 663). According to
    Reyes, the high return rates establish that Zions Bank and
    Modern Payments had reason to know that the telemarketers
    were engaged in fraudulent conduct.
    Reyes produced additional evidence to support his
    argument. That evidence included internal e-mails wherein
    Zions Bank, Netdeposit, and Modern Payments discussed the
    7
    As noted, Reyes alleges that this fraudulent scheme
    constituted an “enterprise” under RICO, 18 U.S.C. § 1962(c).
    However, since the only issue before us is the District Court’s
    refusal to certify a class under Rule 23, we need not discuss
    the elements needed to prove a RICO conspiracy except
    insofar as they may bear upon issues of class certification.
    7
    “staggering” return rates, JA 686, and the “alarm” that their
    high return rates had caused NACHA. 
    Id. at 814-15.
    According to Reyes, “[w]ithin the first three months of
    opening Modern Payments, for example, Zions was notified
    of the likelihood of fraud by the Federal Trade Commission
    (“FTC”), NACHA, and its own officers.” Appellant Br. at
    28.     There was also evidence that these defendants
    communicated concern that they may be at risk for some of
    their business lines being used for money laundering. JA
    692.
    Reyes claims the evidence establishes that “[e]ach of
    the[] frauds operated in the same way, luring consumers with
    some kind of ‘card’ or ‘benefit’ to obtain their bank account
    information.”     Appellant Br. at 18.8        These included
    “promises of un-secured loans, pre-paid credit cards,
    merchandise-club cards, identity-theft protection plans, and
    health-care discount plans.” Meyer Decl., JA 1639-40 ¶ 19.
    Thus, although there is some variation in the “benefits”
    offered and the particular way each fraud was perpetrated,
    Reyes asserts that there is no need to examine each individual
    transaction “[b]ecause the business model of these schemes is
    inherently fraudulent[.]” Appellant Br. at 19.
    A.     REYES’ EXPERT WITNESSES
    Reyes offered several witnesses at the hearing on class
    certification, including three experts. Amelia H. Boss, a
    Drexel Law School Professor, testified as an expert on
    banking and banking practices. Robert J. Meyer, a Wharton
    Business School Professor, and Barbara A. Blake, a former
    investigator for the Iowa Attorney General, both testified as
    experts on fraudulent marketing practices. Although we refer
    8
    Reyes also cites numerous proceedings against some
    of the telemarketers involving the FTC and other entities that
    led to conclusions that the telemarketers were engaged in
    fraud. See Appellant Br. at 4, 16, 20-21. The defendants
    point out, and Reyes does not dispute, that the government
    enforcement actions involving the telemarketers in this case
    were initiated after the defendants stopped doing business
    with them, and the defendants were not themselves parties to
    any of those actions. Appellee Br. 49.
    8
    to their testimony throughout our discussion, it is helpful to
    provide an initial summary of the testimony of each.
    1.     Amelia H. Boss
    Professor Amelia Boss repeatedly highlighted “the
    excessively high rates of returns generated by Modern
    Payments and its clients, of which Zions was well aware,”
    and asserted that the rates provided clear evidence of
    fraudulent activity. Boss Decl., JA 582-92 ¶¶ 66-87.
    According to Professor Boss, most “banks never (or rarely)
    have debits returned as ‘unauthorized.’” 
    Id., JA 582
    ¶ 66.
    Indeed, Zions Bank did not have any unauthorized returns
    until it began working with Modern Payments. Boss pointed
    out that when Modern Payments and Zions Bank began
    working together in September 2006, the “number of
    unauthorized returns immediately began to increase
    dramatically from zero . . . to 799” in two months, and up to
    2,632 unauthorized returns by February of the following year.
    
    Id., JA 587-88
    ¶ 78 (emphasis in original). According to
    Professor Boss, when adjusted for size, Zions Bank had the
    worst return rate of any bank in the country. 
    Id. Professor Boss
    also testified that Zions Bank had
    numerous NACHA violations, knew that many of its
    customers were high risk, and yet it completed inadequate
    due diligence. 
    Id., JA 587
    ¶ 77. She explained that NACHA
    “prohibits the use of the ACH system for telemarking
    payments initiated by outbound telemarketing.” 
    Id., JA 575
    ¶
    46.9 NACHA imposed this prohibition because it recognized
    that telemarketers have a high likelihood of fraud. 
    Id., JA 575
    ¶ 46.
    NACHA requires that transmission of debit and credit
    entries and entry of data over the ACH Network be entered
    with an appropriate label or code. 
    Id., JA 561-63
    ¶¶ 15-16,
    9
    See also Appellant Br. at 11-12 (discussing “rules
    that prohibit banks from entering transactions derived from
    outbound telemarketing (i.e., the type of cold-calling that Mr.
    Reyes experienced).”) (citing JA 672 (2008 ACH Rules,
    NACHA, Subsection 14.1.63)); Boss Decl., JA 597-601 ¶¶
    98-107.
    9
    18. For instance, transactions originating on the Internet, like
    those from the allegedly fraudulent Internet merchants here,
    are labeled “WEB,” while certain telephone-initiated debits,
    like those from telemarketers, are labeled “TEL.” 
    Id., JA 562-63
    ¶ 18. According to Professor Boss, Zions Bank and
    Modern Payments failed to adhere to this policy because
    Modern Payments often labeled TEL or WEB transactions as
    “PPD” transactions. “PPD” refers to transactions that are
    “obtained in pre-existing, signed writings.” 
    Id., JA 597-98
    ¶
    99. They are, therefore, the safest category of transaction.
    Mislabeling made it appear that the consumer had actually
    authorized his or her bank account to be debited even though
    there were no such written agreements.
    “Zions knew that th[ese] representation[s] w[ere]
    false.” 
    Id., JA 597-98
    ¶ 99. Yet, “[d]espite being advised of
    [its] use of improper codes[,] Zions continued to attach the
    false codes and continued to misrepresent the warranties.”
    
    Id., JA 598
    ¶ 101. According to Reyes, the mislabeling made
    it possible to “hid[e] . . . the true source of the debits[]” “from
    victims’ banks and regulators[.]” Appellant Br. at 30 (citing
    Boss Decl., JA 597-99 ¶¶ 98-102). If accepted by a
    factfinder, this testimony could obviously establish that the
    PPD code was used to conceal the true nature of these
    transactions. Accordingly, Professor Boss concluded that
    Zions Bank
    knowingly allowed the system to be used by
    High Risk originators[, like Modern Payments,]
    whom it had to know were engaged in fraud in
    clear disregard of the governing rules and
    standards,     .    .     .    made     knowing
    misrepresentations to the other participants in
    the ACH system (including the consumer
    receivers), . . . facilitated the misuse of the
    system by Modern Payments and its customers,
    and . . . did all this knowing of facts from
    which, as a banking institution, it had to know
    fraud was taking place.
    Boss Decl., JA 601 ¶ 107.
    2.     Robert J. Meyer
    10
    Professor Robert Meyer testified that the Federal
    Reserve Bank has concluded that 10% return rates are prima
    facie evidence of fraud.10 Meyer Decl., JA 1636 ¶ 11.b.
    Here, the return rates “rang[ed] from 30% to almost 90%[.]”
    
    Id., JA 1636
    ¶ 11.a. In addition, Professor Meyer pointed to
    FTC enforcement actions and these telemarketers’ products
    and services to conclude that the telemarketers operated
    “schemes designed to obtain victims’ bank account
    information by deception and to use that information to debit
    victims’ accounts as quickly [and] as often as possible before
    the victim understood what had occurred.” 
    Id., JA 1634-35
    ¶¶ 8-9.
    According to Professor Meyer, telemarketers
    NHS/PHS, the Platinum Benefit Group, Vexeldale (also
    known as Market Power Marketing Solutions, Sourdale, and
    ZaZoom), RxSmart, Low Pay, and Group One Networks
    offered a variety of products that were either valueless or
    significantly devalued. 
    Id., JA 1633,
    1639-40 ¶¶ 6, 19.
    Although there was some variation in the manner in which
    the unauthorized debits were accomplished, Professor Meyer
    concluded that they had the same components of deception:
    (1) each was obtained from a first party at a small or
    10
    The defendants contest this statement, noting that
    “[t]here is no law or regulation supporting this contention.”
    Appellee Br. at 47 (emphasis in original). Professor Meyer,
    like Investigator Blake and Reyes, who also refer to the
    Federal Reserve Bank’s prima facie evidence of fraud, fails to
    include a source. The record presented, however, does
    contain an unrelated complaint quoting an unnamed Federal
    Reserve official as writing that a 10% return rate “would
    likely be regarded by bank supervisory agencies and/or law
    enforcement agencies as prima facie evidence that your bank
    knew or should have known that your [third-party payment
    processors and/or merchants] had engaged in fraudulent
    activities.” JA 1695 ¶ 64 (alteration in original). Despite
    whatever dispute the parties have regarding the Federal
    Reserve Bank’s position on return rates, neither party disputes
    that the vast majority of U.S. banks have rates of returns that
    are close to (or actually are) zero, while here, that number is
    30% to 90%.
    11
    negligible cost; (2) all were used to debit consumer accounts
    for exorbitant amounts, (3) none of these items conveyed any
    net value to the consumers, and (4) all were sufficiently
    complex, initially concealing their fraudulent nature to the
    victim. 
    Id., JA 1639-40
    ¶ 19. Professor Meyer based his
    opinion on his review of “telephone scripts and web landing
    pages used in the marketing of the products and/or programs,
    internal e[-]mails, and tables of ACH return rates for the
    programs[.]” 
    Id., JA 1633
    ¶ 6.
    3.    Barbara A. Blake
    Reyes’ expert Investigator Barbara Blake examined
    each scheme in detail and also stated that return rates over
    10% were prima facie evidence of fraud. Blake Decl., JA
    1614-15 ¶ 19.
    Investigator Blake looked at the operations of each
    entity and other evidence before concluding that the
    telemarketers operate “fundamentally fraudulent schemes[.]”
    
    Id., JA 1627-28
    ¶ 85. She noted that the “[h]igh return rates
    are the plainest hallmark of mass-marketing fraud conducted
    through the banking system. This has been recognized in
    publications of the Comptroller of the Currency, FinCen,
    NACHA and the FDIC.” 
    Id., JA 1614
    ¶ 18.
    Investigator Blake concluded that “each of the
    schemes at issue was a totally fraudulent mass-marketing
    fraud” because each of them “uses purported ‘products’ and
    ‘services’ that are routinely used as part of mass-marketing
    fraud schemes.” 
    Id., JA 1613
    ¶ 15. “Th[e] strong
    presumption of fraud [evidenced by the high return rates] is
    confirmed by the nature of the schemes . . . , which, once they
    are understood, are plainly fraudulent on their face.” 
    Id., JA 1615
    ¶ 21. Investigator Blake’s conclusion was based on the
    telemarketers’ sales scripts, the worthless nature of the
    purported “products,” and the history of regulatory actions
    taken against the telemarketers and their principals. 
    Id., JA 1613
    -27 ¶¶ 15-84.
    B.    FACT WITNESSES
    12
    The District Court also heard the testimony of two fact
    witnesses whose testimony will be discussed in greater detail
    below.11 They were: Wayne D. Geisser, who was installed as
    the NHS Systems receiver after the FTC obtained a
    preliminary injunction against NHS Systems, and Jeanette A.
    Fox, who was a senior director of risk investigation at
    NACHA. Appellant Br. at 12, 26. Geisser and Fox testified
    that high return rates are not dispositive of fraud. Fox Dep.,
    JA 2987-2991; Geisser Dep., JA 1155, 3055. Fox explained
    that an unauthorized return could be the result of a dispute
    over an agreement, the amount charged, or the timing of the
    charge. Fox Dep., JA 2975. Nevertheless, Fox did believe
    that the rate of returns here was high enough to warrant an
    investigation. 
    Id., JA 1145.
    Even she agreed that the rates
    strongly suggested fraud. 
    Id., JA 2977
    (stating there is
    “[p]robably not” a legitimate reason for excessive return
    rates). Geisser testified that the NHS Systems health discount
    program brochures, fulfillment packages, purchase orders,
    and contracts with call centers appeared to be legitimate,
    Geisser Dep., JA 3049-50, even though he agreed that NHS
    Systems was totally fraudulent. 
    Id., JA 1161.
    C.    DEFENDANTS’ EXPERT WITNESSES
    The defendants presented two experts: Kathleen O.
    Milner, an expert in the ACH Network and NACHA rules and
    guidance, who worked for many years in private financial
    services, and Peter G. Djinis, a lawyer who specializes in
    compliance concerning federal anti-money laundering and
    Bank Secrecy Act laws and regulations with experience in the
    Department of the Treasury.
    1.    Kathleen O. Milner
    Kathleen Milner provided an overview of the ACH
    system and NACHA. She explained that, although “NACHA
    Operating Rules are contractually binding on parties to ACH
    payments,” like the NACHA Operating Guidelines, they do
    not “have the force of law[.]” Milner Decl., JA 3781-82 ¶ 11.
    11
    Fox and Geisser were called by plaintiff’s counsel as
    “fact witnesses.” JA 2696; Fox Decl., JA 2972.
    13
    Milner also discussed high return rates, noting that
    high returns rates “may be indicative of fraud,” but believed
    that they are not “conclusive evidence of fraud.” 
    Id., JA 3784
    ¶ 17. In support of this assertion, Milner summarized various
    return codes that are used to identify transactions that are not
    properly authorized, highlighting the ones used in this case
    that are not dispositive of fraud. 
    Id., JA 3785-89
    ¶¶ 20-29.
    She believed that, “without investigating the facts and
    circumstances of each purported fraudulent transaction, you
    are left simply with conjecture[]” about whether fraud is
    involved. 
    Id., JA 3789
    ¶ 29. She also testified that, “[t]o
    conclude that the merchants were in fact complete frauds and
    to further conclude that the Zions Defendants knew them to
    be so would require an individualized analysis of each
    merchant and the Zions Defendants’ relationship with each
    merchant.” 
    Id. Milner rejected
    Reyes’ assertion that the mislabeled
    codes (labeling “TEL” and “WEB” transactions as “PPD”
    transactions) indicate fraud. Rather, she concluded that the
    mislabeled classifications were the result of a problem with
    Modern Payments’ software. 
    Id., JA 3791
    ¶ 33. According
    to Milner, using the TEL code liberally, not solely when there
    was a preexisting relationship or consumer-initiated call was
    not fraud, but due, in part, to the fact that “the requirements of
    the TEL rule were broken up throughout the NACHA
    rulebook and were, therefore, difficult to locate and confusing
    to follow.” 
    Id., JA 3794-95
    ¶ 39.
    Finally, Milner asserted that charging a fee for
    returned transactions was also not indicative of fraud because
    it is “accepted industry practice” to do so “as a disincentive
    for Originators having returned transactions and an incentive
    to obtain proper authorizations.” 
    Id., JA 3795
    ¶ 40.
    2.     Peter G. Djinis
    Peter Djinis discussed various laws and regulations not
    at issue here, including Office of the Comptroller of the
    Currency bulletins, the Bank Secrecy Act, and the U.S.
    Patriot Act, Djinis Decl., JA 3767-70 ¶¶ 13, 16, 18-20, since
    Reyes alleges a RICO violation. Djinis also opined that
    Modern Payments and Zions Bank conducted adequate due
    14
    diligence of the telemarketers at issue. 
    Id., JA 3772-76,
    ¶¶
    25-36.
    D.     REYES’ USE OF THE EVIDENCE
    Reyes relies on this record to allege that the defendants
    operated a RICO enterprise that was a “complete sham”
    lacking any legitimate business substance. He draws upon
    this theory to overcome potential challenges to the
    predominance requirement for class certification. Under the
    “complete sham” theory, the reviewing court can focus on the
    defendant’s or defendants’ conduct as a whole in order to find
    proof of elements that normally require evidence about each
    plaintiff, like plaintiff’s reliance. Rosario v. Livaditis, 
    963 F.2d 1013
    (7th Cir. 1992); Cullen v. Whitman Med. Corp.,
    
    188 F.R.D. 226
    (E.D. Pa. 1999); see also In re Cmty. Bank of
    N. Va. Mortg. Lending Practices Litig., --- F.3d ---, Civ.
    Action No. 13-4273, 
    2015 WL 4547042
    , at *19, *21 (3d Cir.
    July 29, 2015). “[T]he causation element of fraud and breach
    of contract can be satisfied through objective circumstantial
    evidence on a classwide basis.” Elizabeth J. Cabraser, Trends
    and Developments in the Filing, Certification, Settlement,
    Trial and Appeal of Class Actions, SE99 A.L.I.-A.B.A. 743,
    821 (2000) (“[I]t is unnecessary and unfair to impose
    modalities of proof that are specific to such nonexistent
    personal relationships to insulate defendants from classwide
    liability to those with whom they related on a classwide
    basis.”).
    E.  THE DISTRICT COURT’S RESOLUTION OF
    REYES’ LEGAL THEORY
    The District Court acknowledged the “complete sham”
    theory, explaining that in order for Reyes to succeed on this
    theory under Rule 23, he must demonstrate that the
    “defendant’s conduct is so wrought with fraud as to be a
    complete sham[.]” Reyes, 
    2013 WL 5332107
    , at *6. Thus,
    the District Court realized that, in an appropriate case, “the
    class members’ participation or involvement with the
    defendant is sufficient evidence that each class member
    suffered damages, rendering an analysis of individual
    transactions unnecessary.” 
    Id. As the
    District Court also
    recognized, pursuant to the “complete sham” theory,
    15
    misrepresentations by the defendant resulting in the plaintiffs
    experiencing common damages can prove common injury in
    a RICO class action. 
    Id. (citing Cullen,
    188 F.R.D. at 235).12
    In fact, the District Court even went so far (with some
    justification) as to compare this to the “fraud on the market”
    theory. 
    Id. (citing Lester
    v. Percudani, 
    217 F.R.D. 345
    , 352
    (M.D. Pa. 2003).13
    However, the District Court concluded that class
    treatment was inappropriate here because Zions Bank and
    Modern Payments collaborated with separate mass-marketing
    firms and did so in different ways. The District Court
    12
    As discussed further below, the Supreme Court has
    held that predominance requires that plaintiffs show that their
    individual injuries are capable of proof at trial through
    common evidence and that their damages are measurable on a
    classwide basis. Comcast Corp. v. Behrend, 
    133 S. Ct. 1426
    ,
    1430, 1432-33 (2013); but see In re Nexium Antitrust Litig.,
    
    777 F.3d 9
    , 21 (1st Cir. 2015) (“But it is well-established that
    the individuation of damages in consumer class actions is
    rarely determinative under Rule 23(b)(3). Where common
    questions predominate regarding liability, then courts
    generally find the predominance requirement to be satisfied
    even if individual damages issues remain.” (internal quotation
    marks, alterations, and citation omitted)).
    13
    The fraud on the market theory is based on
    the hypothesis that, in an open and developed
    securities market, the price of a company’s
    stock is determined by the available material
    information regarding the company and its
    business. . . . Misleading statements will
    therefore defraud purchasers of stock even if the
    purchasers do not directly rely on the
    misstatements. . . . The causal connection
    between the defendants’ fraud and the
    plaintiffs’ purchase of stock in such a case is no
    less significant than in a case of direct reliance
    on misrepresentations.
    Basic Inc. v. Levinson, 
    485 U.S. 224
    , 241-42 (1988)
    (internal quotation marks omitted).
    16
    stressed that “Reyes almost completely relies on the high
    return rates as his proof of the complete sham, [but] the
    returns are different for each telemarketer, [therefore] he
    cannot prove this complete sham theory on evidence common
    to the class since members of the class interacted with
    different telemarketers.” 
    Id. at *8.
    The District Court also
    emphasized that, although the high return rates were common
    to the telemarketers, they are insufficient to prove fraud.
    With this background as our analytical compass, we
    will now discuss class certification within the context of
    Reyes’ claim that he produced sufficient evidence of a sham
    enterprise to satisfy the requirements for class certification
    under Rule 23(b)(3).
    II.    DISCUSSION
    “The class action is an exception to the usual rule that
    litigation is conducted by and on behalf of the individual
    named parties only.” Wal-Mart Stores, Inc. v. Dukes, 131 S.
    Ct. 2541, 2550 (2011) (quotation marks omitted).
    Federal Rule of Civil Procedure 23 sets out
    requirements for bringing a class action. All potential classes
    must initially satisfy four prerequisites to be certified: (1)
    numerosity, (2) commonality, (3) typicality, and (4) adequacy
    of representation. Fed. R. Civ. P. 23(a). Additional
    requirements must then be satisfied depending on whether a
    plaintiff seeks certification under Rule 23(b)(1), (2), or (3).
    Marcus v. BMW of N. Am., LLC, 
    687 F.3d 583
    , 590 (3d Cir.
    2012). Reyes is attempting to proceed under Rule 23(b)(3).
    Accordingly, he must satisfy the additional requirements of
    predominance and superiority.14 Fed. R. Civ. P. 23(b)(3).
    14
    When an action proceeds as a class action under
    Rule 23(b)(3), “the court finds that the questions of law or
    fact common to class members predominate over any
    questions affecting only individual members, and that a class
    action is superior to other available methods for fairly and
    efficiently adjudicating the controversy.” Fed. R. Civ. P.
    23(b)(3).
    17
    The District Court did not reach all of the prerequisites
    of Rule 23(a) or the superiority requirement in Rule 23(b)(3)
    because it concluded that Reyes had not established
    commonality as required under Rule 23(a) or predominance
    under Rule 23(b)(3).
    “Commonality” is a consideration of whether there are
    “questions of law or fact common to the class[.]” Fed. R.
    Civ. P. 23(a)(2). Commonality is satisfied when there are
    classwide answers. Wal-Mart Stores, 
    Inc., 131 S. Ct. at 2551
    -
    52; Sullivan v. DB Invs., Inc., 
    667 F.3d 273
    , 298-300 (3d Cir.
    2011) (en banc) (considering “whether the defendant’s
    conduct was common as to all of the class members[]” and
    common questions led to common answers such that the
    “alleged misconduct and the harm it caused would be
    common as to all of the class members[]”).
    The predominance inquiry then focuses on whether
    “the questions of law or fact common to class members
    predominate over any questions affecting only individual
    members[.]” Fed. R. Civ. P. 23(b)(3). “Predominance tests
    whether proposed classes are sufficiently cohesive to warrant
    adjudication by representation[.]” In re Hydrogen Peroxide
    Antitrust Litig., 
    552 F.3d 305
    , 310-11 (3d Cir. 2008)
    (quotation marks omitted). Though related, this standard is
    “‘far more demanding’ than the commonality requirement of
    Rule 23(a),” 
    id. (quoting Amchem
    Prods., Inc. v. Windsor,
    
    521 U.S. 591
    , 623-24 (1997)), and requires “more than a
    common claim.” Newton v. Merrill Lynch, Pierce, Fenner &
    Smith, Inc., 
    259 F.3d 154
    , 187 (3d Cir. 2001).
    Reyes seeks to represent a class that may include tens
    of thousands of claimants with potential civil RICO claims
    arising from the defendants’ operation of a sham enterprise.
    “Establishing liability under [§ 1962(c)] of the RICO statute
    requires (1) conduct (2) of an enterprise (3) through a pattern
    (4) of racketeering activity, plus an injury to business or
    property.” In re Ins. Brokerage Antitrust Litig., 
    579 F.3d 241
    ,
    269 (3d Cir. 2009) (internal quotation marks and citations
    omitted).
    Reyes must show that the racketeering activity was the
    “but for” cause as well as the proximate cause of the injury
    18
    purportedly suffered by the members of the proposed class.
    Holmes v. Sec. Investor Prot. Corp., 
    503 U.S. 258
    , 268
    (1992). Proximate cause requires “some direct relation
    between the injury asserted and the injurious conduct
    alleged.” 
    Id. Accordingly, we
    must determine if Reyes produced
    sufficient evidence to show that he could prove his RICO
    claim based on facts or evidence common to the class, and
    whether such proof predominates over facts and
    circumstances that are particular to given individuals within
    the proposed class.
    The District Court concluded that Reyes established
    neither but-for cause, nor proximate cause because “Reyes
    would not be able to establish there was an impact that
    affected each class member in the same way.” Reyes, 
    2013 WL 5332107
    , at *8. In reaching that conclusion, the District
    Court focused on the fact that potential class “[m]embers
    were contacted by telemarketers through different mediums
    about different products, and some, according to Reyes, were
    not contacted at all because the telemarketers bought their
    account information from other telemarketers.” 
    Id. We must
    determine whether the District Court (1)
    applied the proper standard for assessing predominance and
    commonality, (2) appropriately reviewed Reyes’ experts’
    opinions and the other evidence on the record, and (3)
    properly determined that commonality and predominance
    were not established based on the evidence presented. Much
    of our inquiry is guided by our analysis in In re Hydrogen
    Peroxide Antitrust Litigation.
    A.    STANDARD OF REVIEW
    In reviewing a denial of class certification, we subject
    the District Court’s legal rulings to de novo review. In re
    Hydrogen Peroxide Antitrust 
    Litig., 552 F.3d at 312
    ; see also
    In re Initial Pub. Offerings Sec. Litig., 
    471 F.3d 24
    , 32 (2d
    Cir. 2006).
    We review the District Court’s findings of fact, its
    application of law to facts, and its decision regarding class
    19
    certification for an abuse of discretion. In re Hydrogen
    Peroxide Antitrust 
    Litig., 552 F.3d at 312
    , 320 (citations
    omitted). “The district court abused its discretion if its
    decision rests upon a clearly erroneous finding of fact, an
    errant conclusion of law or an improper application of law to
    fact.” 
    Newton, 259 F.3d at 165-66
    (footnote and quotation
    marks omitted). “To illustrate . . . using the example of
    numerosity, review of the factual finding as to the size of the
    proposed class would be for clear error, review of the judge’s
    articulation of the legal standard governing numerosity would
    be de novo, and review of the ultimate ruling that applied the
    correct legal standard to the facts as found would be for abuse
    of discretion.” In re Initial Pub. Offerings Sec. 
    Litig., 471 F.3d at 41
    .
    B.     RULE 23 LEGAL STANDARDS
    “Class certification is proper only if the trial court is
    satisfied, after a rigorous analysis, that the prerequisites of
    Rule 23 are met.” In re Hydrogen Peroxide Antitrust 
    Litig., 552 F.3d at 309
    (footnote and quotation marks omitted). In
    conducting its inquiry, a district court must rigorously assess
    “the available evidence and the method or methods by which
    plaintiffs propose to use the evidence to prove impact at
    trial.” 
    Id. at 312
    (citations omitted); see also Comcast Corp.
    v. Behrend, 
    133 S. Ct. 1426
    , 1432 (2013) (“[T]he court’s duty
    [is] to take a ‘close look’ at whether common questions
    predominate over individual ones.” (quoting Amchem
    Products, 
    Inc., 521 U.S. at 615
    ). On appeal, we do not
    “speculate as to what the District Court must have intended
    [regarding a Rule 23 requirement]. We cannot just assume
    the District Court conducted the appropriate analysis under
    Rule 23. ‘Rigorous analysis’ requires more of the District
    Court than that[.]” Neale v. Volvo Cars of N. Am., LLC, ---
    F.3d ---, Civ. Action No. 14-1540, 
    2015 WL 4466919
    , at *15
    (3d Cir. July 22, 2015).
    We have also explained that the Rule 23 inquiry may
    require the district court to “delve” behind the pleadings. In
    re Hydrogen Peroxide Antitrust 
    Litig., 552 F.3d at 316
    (quotation marks omitted).          This means that, at the
    certification stage, the district court “cannot be bashful. It
    must resolve all factual or legal disputes relevant to class
    20
    certification, even if they overlap with the merits—including
    disputes touching on elements of the cause of action.”
    
    Marcus, 687 F.3d at 591
    (quotation marks omitted).
    Without this searching inquiry, a district court cannot
    determine if class certification is appropriate. Certification
    “calls for findings by the court, not merely a ‘threshold
    showing’ by a party, that each requirement of Rule 23 is met.
    Factual determinations supporting Rule 23 findings must be
    made by a preponderance of the evidence.” In re Hydrogen
    Peroxide Antitrust 
    Litig., 552 F.3d at 307
    .
    1.     Reyes’ Burden of Proof
    The District Court imposed a burden of absolute proof
    on Reyes at the certification stage. Reyes now correctly
    argues that “the ‘absolute proof of fraud’ standard . . .
    exceeds this Court’s holding that factual issues bearing on the
    class certification ‘must be made by a preponderance of the
    evidence.’” Appellant Br. at 35 (quoting In re Hydrogen
    Peroxide Antitrust 
    Litig., 552 F.3d at 320
    ).
    The District Court realized that “[t]o obtain class
    certification, a plaintiff must demonstrate the proposed class
    satisfies all four elements of Federal Rule of Civil Procedure
    23(a), along with one of the three requirements under Rule
    23(b)[,]” and that “the court’s findings as to the Rule 23
    requirements must be supported by factual determinations
    made by a preponderance of the evidence[.]” Reyes, 
    2013 WL 5332107
    , at *3 (citations omitted). However, the District
    Court’s analysis suffered from the same malady that troubled
    us in In re Hydrogen Peroxide Antitrust Litigation. “[S]ome
    statements in [the District Court’s] opinion depart from the
    standards we have 
    articulated.” 552 F.3d at 321
    . The District
    Court stated the correct standard but misunderstood the
    burden of proof placed on a plaintiff seeking class
    certification.
    In concluding that there was insufficient commonality,
    the District Court relied on the fact that “Reyes’s experts have
    [not] testified that the return rates are . . . absolute proof of
    fraud[.]” Reyes, 
    2013 WL 5332107
    , at *8. The District Court
    also believed that proof must be so persuasive that the
    21
    certifying court “cannot have any doubt as to whether the
    Rule 23 requirements are met.” 
    Id. at *7.
    The fact that the District Court imposed a burden of
    absolute proof is illustrated by the following statement: “since
    Reyes’s experts have testified that the return rates are only
    ‘red flags’ of fraud and not absolute proof of fraud, the
    factfinder would have to analyze each telemarketer separately
    to determine whether or not it is a complete sham.” 
    Id. at *8
    (emphasis added). The District Court also stated that it “must
    assess how Reyes will use the evidence at trial to prove
    impact on a classwide basis, and the Court cannot have any
    doubt as to whether the Rule 23 requirements are met.” 
    Id. at *7
    (emphasis added) (citation omitted).
    In re Hydrogen Peroxide Antitrust Litigation requires
    that a district court “not suppress doubt as to whether a Rule
    23 requirement is 
    met[.]” 552 F.3d at 321
    (internal quotation
    marks omitted). While a district court must consider how the
    evidence will be used at trial, 
    id. at 311
    & n.8, the plaintiff’s
    burden is not proof beyond “any doubt” as the District Court
    required, but whether the claims are supported by a
    preponderance of the evidence. 
    Id. at 320.
    We agree with the District Court’s conclusion that “it
    is possible that not every telemarketer named in the Amended
    Complaint is a complete sham.” Reyes, 
    2013 WL 5332107
    , at
    *7. However, the standard is not whether it is mathematically
    or scientifically possible that one of these telemarketers is not
    a complete sham. Rather, Reyes must establish that it is more
    likely than not that each of the telemarketers and the
    defendants operated a complete sham as alleged. Reyes
    “must affirmatively demonstrate his compliance” with Rule
    23, Wal-Mart Stores, 
    Inc., 131 S. Ct. at 2551
    , and “satisfy
    [the trial court] through evidentiary proof [of] at least one of
    the provisions of Rule 23(b).” Comcast 
    Corp., 133 S. Ct. at 1432
    ; see also Byrd v. Aaron’s Inc., 
    784 F.3d 154
    , 163 (3d
    Cir. 2015). However, “the Rules and our case law have
    consistently made clear that plaintiffs need not actually
    establish the validity of claims at the certification stage.”
    
    Sullivan, 667 F.3d at 306
    (footnote omitted).
    22
    Here, as in In re Hydrogen Peroxide Antitrust
    Litigation, in remanding this matter to the District Court, we
    “recognize that the able District Court did not have the
    benefit of the standards we have 
    articulated.” 552 F.3d at 322
    . Nevertheless, it is now clear that the District Court must
    (1) conduct rigorous analysis, (2) review all avenues of
    inquiry in which it may have doubts (even if it requires
    reviewing the merits) in order to (3) be satisfied and (4) make
    a definitive determination on the requirements of Rule 23, or
    even (5) require that a plaintiff demonstrate actual, not
    presumed conformance with Rule 23 requirements. We
    stress, however, that the preponderance of the evidence
    standard governs. The perfection of proof that the District
    Court demanded here is simply not required. Moreover, it is
    important for the District Court to remember that an inability
    to calculate damages on a classwide basis will not, on its own,
    bar certification. Neale, 
    2015 WL 4466919
    , at *17 & n.10
    (collecting cases). A district court errs when it holds a
    plaintiff seeking class certification to a higher standard of
    proof than proof by a preponderance of the evidence, and
    remand is thus appropriate. See In re Hydrogen Peroxide
    Antitrust 
    Litig., 552 F.3d at 322
    (“To the extent that the
    District Court’s analysis reflects application of incorrect
    standards, remand is appropriate.”).
    2.    Evidence of Commonality and Predominance
    It is often appropriate to discuss commonality and
    predominance together because the commonality inquiry is
    subsumed into the predominance inquiry. See, e.g., Danvers
    Motor Co. v. Ford Motor Co., 
    543 F.3d 141
    , 148 (3d Cir.
    2008) (“[W]here an action is to proceed under Rule 23(b)(3),
    the commonality requirement is subsumed by the
    predominance requirement.” (internal quotation marks
    omitted)). We have also concluded that “[r]eading the
    District Court’s commonality and predominance analyses
    together . . . is appropriate in [the RICO] context[.]” In re
    Ins. Brokerage Antitrust 
    Litig., 579 F.3d at 266-67
    (citation
    omitted).
    Therefore, we do not fault the District Court for
    combining its discussions of commonality and predominance.
    Reyes, 
    2013 WL 5332107
    , at *5-9. However, in the interest
    23
    of clarity, we will address each requirement separately. We
    will first discuss commonality, and then discuss
    predominance. In re LifeUSA Holding, Inc., 
    242 F.3d 136
    ,
    145 (3d Cir. 2001) (“[C]ommon questions (commonality)
    must be established before predominance can be found . . . .”
    (emphasis added)); see generally 
    Marcus, 687 F.3d at 597
    ,
    600-12.
    a.     Commonality
    As explained above in relation to the different return
    rates, the District Court concluded that because Reyes’
    evidence “result[s] in individual inquiries as to each
    telemarketer,” class certification is precluded. Reyes, 
    2013 WL 5332107
    , at *8. The focus of the District Court’s inquiry
    was whether the proposed class would “generat[e] common
    answers apt to drive the resolution of the litigation, such that
    a determination of the truth or falsity of the contention will
    resolve an issue that is central to the validity of each one of
    the claims in one stroke.” 
    Id. at *4
    (emphasis in original)
    (internal quotation marks omitted).
    Federal Rule of Civil Procedure 23(a)(2) merely
    requires that there be “questions of law or fact common to the
    class[.]” Commonality does not require perfect identity of
    questions of law or fact among all class members. Rather,
    “even a single common question will do.” Wal-Mart Stores,
    
    Inc., 131 S. Ct. at 2556
    (quotation marks and alterations
    omitted); Baby Neal v. Casey, 
    43 F.3d 48
    , 56 (3d Cir. 1994)
    (discussing how Rule 23(a)(2) “is easily met[]”). “A putative
    class satisfies Rule 23(a)’s commonality requirement if the
    named plaintiffs share at least one question of fact or law with
    the grievances of the prospective class.” Rodriguez v. Nat’l
    City Bank, 
    726 F.3d 372
    , 382 (3d Cir. 2013) (internal
    quotation marks omitted). A court’s focus must be “on
    whether the defendant’s conduct [is] common as to all of the
    class members[.]” 
    Sullivan, 667 F.3d at 298
    . “Again, th[e]
    bar is not a high one.” 
    Rodriguez, 726 F.3d at 382
    .
    When a party seeks to certify a class to bring a RICO
    claim, the focus is on the defendant’s conduct. As we said in
    In re Insurance Brokerage Antitrust Litigation:
    24
    [p]roving the first element of a RICO violation
    in this case would involve common questions
    about the activities of the . . . Defendants and, in
    particular, whether the . . . Defendants
    participated or engaged in conduct with other . .
    . Defendants. The second element also involves
    common questions of law and fact, namely
    whether an enterprise of . . . Defendants existed
    . . . either as an association in fact or as a more
    formal organization or entity. Proving the third
    and fourth elements would encompass common
    questions of law and fact as well, including
    whether activities that constitute racketeering
    were taking place through the enterprise (such
    as mail or wire fraud) and whether these
    racketeering activities were recurring such that
    a pattern could be 
    established. 579 F.3d at 269-70
    (emphasis added). These elements focus
    on the defendants’ joint conduct vis-à-vis the plaintiffs.
    Likewise, the District Court in this case noted that “the first
    four elements of a RICO claim . . . focus[] on the defendants’
    conduct and the effect of that conduct.” Reyes, 
    2013 WL 5332107
    , at *5 (citation omitted). Thus, a properly supported
    RICO allegation will often contain common issues because,
    like “commonality[, a RICO allegation,] is informed by the
    defendant’s conduct as to all class members and any resulting
    injuries common to all class members[.]” 
    Sullivan, 667 F.3d at 297
    ; see also In re Ins. Brokerage Antitrust 
    Litig., 579 F.3d at 269-70
    . “Whether the evidence presented proves a RICO
    conspiracy[]” is a question “common to each class member
    and will generate common answers[.]” In re Cmty. Bank of
    N. Va. Mortg. Lending Practices Litig., 
    2015 WL 4547042
    , at
    *13-14.
    We also note that the elements of a RICO claim fit
    Wal-Mart’s commonality requirement because determining
    the “truth or falsity” of a “common contention[,]” here an
    element of RICO, “will resolve an issue that is central to the
    validity of each one of the claims in one stroke.” Wal-Mart
    Stores, 
    Inc., 131 S. Ct. at 2551
    ; see In re Cmty. Bank of N.
    Va. Mortg. Lending Practices Litig., 
    2015 WL 4547042
    , at
    25
    *13 (distinguishing a putative RICO class action from the
    pitfalls of the class action rejected in Wal-Mart).
    Reyes has presented evidence which, if accepted,
    could establish by a preponderance of the evidence that (1)
    “Zions and Modern Payments were processing transactions
    for a number of entities -- in addition to NHS Systems -- that
    government agencies [later] determined were fraudulent[,]”
    Appellant Br. at 15; Appellee Br. at 48-49, (2) Zions Bank,
    Netdeposit, and Modern Payments sent e-mails
    communicating a sense of shock regarding the “staggering”
    return rates, JA 686, and concerns that they may be at risk for
    some of their business lines being used for “money
    laundering[,]” 
    id. at 692,
    (3) Zions Bank was aware that its
    high return rates “alarm[ed]” NACHA,” 
    id. at 814-15,
    and (4)
    Modern Payments was “afraid of” a probe by the FTC
    regarding potential fraud, 
    id. at 693,
    and Zions Bank received
    warnings from other banks that they “will disput[e] all
    charges” generated by NHS Systems. 
    Id. at 1061-62.
    On
    remand, the District Court should consider whether this
    evidence, if accepted as credible, is sufficient to conclude that
    there is “actual, not presumed, conformance” with Rule 23.
    
    Marcus, 687 F.3d at 591
    (quotation marks omitted); see also
    Wal-Mart Stores, 
    Inc., 131 S. Ct. at 2551
    (requiring “[a] party
    seeking class certification [to] affirmatively demonstrate”
    compliance with Rule 23).
    We are not persuaded that the evidence here is similar
    to that which was deemed insufficient for class certification in
    Wal-Mart. Wal-Mart affirmed that commonality can be
    satisfied when there is “significant proof” that the defendant
    “operated under a general policy of discrimination.” 
    Id. at 2553-54
    (quotation marks omitted).
    In Wal-Mart, the defendant operated in a discretionary,
    and thus arguably individualized way toward the members of
    the proposed class. The record did not establish a national
    policy or any single individual or group of individuals
    responsible for the exercise of discretion.
    Here, there are slight variations in the telemarketers’
    and defendants’ conduct underlying the putative class
    members’ claims. For example, some plaintiffs were offered
    26
    government grants, while others were offered healthcare
    discount cards, and still others had no direct involvement at
    all as their account information was purchased by a
    defendant. However, unlike Wal-Mart, we are not concerned
    with damages that result from the exercise of anyone’s
    discretion.
    Further, in Wal-Mart, the plaintiffs’ statistical and
    anecdotal evidence failed to demonstrate a “common mode of
    exercising discretion that pervades the entire company[.]” 
    Id. at 2554-55.
    Without that, commonality could not be
    established.
    In stark contrast, the sham theory used here relies on a
    “common mode” of behavior and a “general policy” of fraud.
    See In re Cmty. Bank of N. Va. Mortg. Lending Practices
    Litig., 
    2015 WL 4547042
    , at *13 (distinguishing Wal-Mart
    and reasoning that “the Plaintiffs in this case have alleged that
    the class was subjected to the same kind of illegal conduct by
    the same entities, and that class members were harmed in the
    same way, albeit to potentially different extents[]”).
    Reyes alleges that the defendants operated together in
    a common, fraudulent scheme that was a complete sham
    masquerading as a legitimate business undertaking. When a
    plaintiff alleges that a defendant’s disputed conduct is a
    complete sham, the relevant inquiry is whether there was an
    ongoing scheme to defraud or deceive, 
    Rosario, 963 F.2d at 1017-19
    , and whether the defendant fails to meet the most
    basic standard of its purported commercial undertaking,
    
    Cullen, 188 F.R.D. at 235
    . If so, a common harm will be
    presumed from the mere fact that class members were all
    similarly injured by the sham. A court can then conclude that
    there are common issues and that those common issues will
    predominate over individual issues.15
    When viewed at this macroscopic level, rather than the
    microscopic level that may be required when allegations
    implicate a defendant’s exercise of discretion, it is clear that
    we are not faced with the individual circumstances that were
    15
    Because the “complete sham” theory also applies to
    the predominance inquiry, it will be discussed further below.
    27
    fatal to certification in Wal-Mart. As said, it is for the
    District Court to determine in the first instance whether Reyes
    has presented evidence that demonstrates commonality.
    b.     Predominance
    Reyes also contends that the District Court erred in
    finding that class claims did not predominate over individual
    claims. He argues that the District Court mistakenly focused
    on the return rates instead of considering that evidence in
    context with all of the testimony of his three experts, the FTC
    proceedings,16 and all other evidence that the defendants
    knew that they were operating a fraudulent enterprise.
    “The Rule 23(b)(3) predominance inquiry tests
    whether proposed classes are sufficiently cohesive to warrant
    adjudication by representation.” Amchem Products, 
    Inc., 521 U.S. at 623
    (citation omitted). It is important to note that
    Reyes is alleging a kind of consumer fraud. “[T]he Supreme
    Court has observed that predominance is a test readily met in
    certain cases alleging consumer or securities fraud or
    violations of the antitrust laws.” In re Hydrogen Peroxide
    Antitrust 
    Litig., 552 F.3d at 321-22
    (quotation marks
    omitted).     One relevant “guidepost[] that direct[s] the
    predominance inquiry[]” is “that commonality is informed by
    the defendant’s conduct as to all class members and any
    resulting injuries common to all class members[.]” 
    Sullivan, 667 F.3d at 297
    . “[Wal-Mart v.] Dukes actually bolsters [this]
    position, making clear that the focus is on whether the
    defendant’s conduct was common as to all of the class
    members, not on whether each plaintiff has a ‘colorable’
    claim.” 
    Id. at 299.
    Rule 23 does not require the absence of
    all variations in a defendant’s conduct or the elimination of
    all individual circumstances.      Rather, predominance is
    satisfied if common issues predominate. In re Linerboard
    Antitrust Litig., 
    305 F.3d 145
    , 162 (3d Cir. 2002). “[T]he
    16
    As noted supra note 8, the proceedings came after
    the defendants’ involvement here. But, if admissible, it
    would be for the factfinder to determine if the record, taken as
    a whole, supports the conclusion (or an inference) that the
    defendants were aware of the facts underlying the
    proceedings, or the proceedings themselves.
    28
    focus of Rule 23(b)(3) is on the predominance of common
    questions[.]” Amgen Inc. v. Connecticut Ret. Plans & Trust
    Funds, 
    133 S. Ct. 1184
    , 1195 (2013) (emphasis in original).
    A district court “analyze[s] predominance in the context of
    Plaintiffs’ actual claims.” Neale, 
    2015 WL 4466919
    , at *14.
    When Rule 23 is the mechanism to redress alleged
    RICO violations, predominance and commonality are
    satisfied if each element of the alleged RICO violation
    involves common questions of law and fact capable of proof
    by evidence common to the class. In re Ins. Brokerage
    Antitrust 
    Litig., 579 F.3d at 269-70
    . This is true even if
    “establishing an injury is not as conducive to common
    proof[,]” so long as a court is “satisfied that the plaintiffs
    have presented a plausible theory for proving a class-wide
    injury as a result of the racketeering activities of the alleged
    enterprises at issue[.]” 
    Id. at 270;
    see also Neale, 
    2015 WL 4466919
    , at *17 & n.10 (collecting cases regarding how an
    inability to calculate damages on a classwide basis will not,
    on its own, bar certification). “The question is not what valid
    claims can plaintiffs assert; rather, it is simply whether
    common issues of fact or law predominate.” 
    Sullivan, 667 F.3d at 305
    (citation omitted); In re Hydrogen Peroxide
    Antitrust 
    Litig., 552 F.3d at 311-12
    .
    The predominance inquiry seeks to resolve whether
    there are “reliable means of proving classwide injury[.]” In
    re Rail Freight Fuel Surcharge Antitrust Litig., 
    725 F.3d 244
    ,
    252-53 (D.C. Cir. 2013); see also In re Nexium Antitrust
    Litig., 
    777 F.3d 9
    , 21 (1st Cir. 2015). This is often done with
    the assistance of experts.
    The District Court relied on Johnston v. HBO Film
    Management, Incorporated, 
    265 F.3d 178
    , 190 (3d Cir.
    2001), and In re LifeUSA Holding, Incorporated, 
    242 F.3d 136
    , 146 (3d Cir. 2001), to conclude that, because these
    “telemarketers . . . interacted with consumers in different
    ways (by telephone, internet, and slamming),” Reyes, 
    2013 WL 5332107
    , at *7, and because return rates are not absolute
    proof that the defendants are a complete sham, “the only way
    to determine if a class member was defrauded was to
    individually examine the interaction between the defendant
    29
    and each class member.” 
    Id. at *6.
    Neither case persuades
    us.
    In In re LifeUSA Holding, Incorporated, the fraud
    involved a product that “was not sold according to standard,
    uniform, scripted sales 
    presentations.” 242 F.3d at 146
    . We
    concluded that simply focusing on whether all potential class
    members were misled by the same product was inappropriate.
    
    Id. We also
    stated that when “the record is uncompromising
    in revealing non-standardized and individualized sales
    ‘pitches’ presented by independent and different sales agents,
    all subject to varying defenses and differing state laws, . . .
    certification of individualized issues [is] inappropriate.” 
    Id. at 147;
    cf. Moore v. PaineWebber, Inc., 
    306 F.3d 1247
    , 1255
    (2d Cir. 2002) (“[M]aterial uniformity in the
    misrepresentations may be established without the use of a
    standardized sales script[, for example.]”).
    In Johnston, we again held that oral misrepresentation
    must be uniform in order to establish predominance under
    Rule 23(b)(3). 
    See 265 F.3d at 190
    . Thus, “it has become
    well-settled that, as a general rule, an action based
    substantially on oral rather than written communications is
    inappropriate for treatment as a class action.” 
    Id. (internal citations
    omitted).
    However, both of those cases involved legitimate
    businesses and Reyes relies upon that to distinguish the
    circumstances here, arguing instead that the defendants and
    telemarketers here were not legitimate business entities. See
    In re Cmty. Bank of N. Va. Mortg. Lending Practices Litig.,
    
    2015 WL 4547042
    , at *19, *21 (affirming the District Court’s
    finding that individual issues of reliance will not predominate
    when the plaintiffs “allege[] that [the defendant] performed
    absolutely no services to earn the . . . fees[]”). Rather, Reyes
    asserts that they all acted in concert to perpetrate fraud
    through a sham enterprise and that each of the defendants had
    to have known the real nature of that fraudulent enterprise.
    He also claims that any variations in the manner in which
    various individuals were defrauded is irrelevant and not
    sufficient to preclude common issues of law from
    predominating. The argument is based on his claim that the
    defendants “engaged in systematic fraud and operated solely
    30
    to debit victims’ accounts[]” and “there is no evidence of any
    cohort of class members who were not victims.” Appellant
    Br. at 64.
    Likewise, in Cullen, plaintiffs claimed that, while the
    “defendants represented that they were providing a program
    that would prepare students for careers as ultrasound
    sonographers[,]” they “misrepresent[ed] the nature of the
    ultrasound program, and failed to provide the education
    
    represented.” 188 F.R.D. at 228
    . Even though the institution
    was accredited, the program that the plaintiffs were enrolled
    in was not. That prevented the program’s graduates from
    sitting for the relevant registration examination. 
    Id. at 228-
    29. The plaintiffs contended that the “defendants’ operation
    was a ‘complete sham,’ and did not provide even a minimal
    education.” 
    Id. at 228.
    Cullen held that the sham theory
    satisfied the predominance requirement and it certified a
    RICO class. Cullen explained: “plaintiffs’ proof will be
    focused on the defendants’ conduct; plaintiffs’ case will
    revolve around evidence that the school did not meet the most
    basic standards of an educational program. It need not
    involve time consuming proof of individual causation or
    reliance.” 
    Id. at 235.
    Instead, at trial, “[i]f the plaintiffs can
    prove that [the defendant] was a complete sham, then a fact
    finder can infer from the evidence that anyone who paid
    tuition and attended the school suffered damage.” 
    Id. Cullen relied
    on Rosario, which had similar facts and
    involved a similar fraudulent scheme. The trial evidence in
    Rosario established that the defendant failed to provide
    students with the skills, equipment, or environment to prepare
    for a cosmetology career for which the school was supposed
    to train students. 
    Rosario, 963 F.2d at 1016-17
    . The Court of
    Appeals for the Seventh Circuit affirmed the District Court’s
    certification of the class. It held that the operative question
    was whether the “schools operated pursuant to an ongoing
    scheme to defraud and deceive prospective students[,]” thus
    applying a “complete sham” theory. 
    Id. at 1018.
    The
    defendants attempted to negate that approach by relying on
    evidence that some students were satisfied with their
    education and two students who graduated did become
    licensed and were working in the field. The Seventh Circuit
    refused to conclude that the defendant-institution was not a
    31
    complete sham merely because “some class members were
    satisfied with their teachers, and at least two class members
    graduated from [the defendant’s] schools and passed the state
    licensing exam.” 
    Id. at 1017.
    Rather, the Court concluded
    that “[t]he fact that there is some factual variation among the
    class grievances will not defeat a class action.” 
    Id. at 1017-18
    (citation omitted).
    While the District Court here recognized Reyes’ theory
    of a sham enterprise, it nevertheless concluded that the
    evidence Reyes offered in support of that theory was
    insufficient to satisfy predominance because different sales
    pitches were used and different products were pitched.
    However, if absolute conformity of conduct and harm were
    required for class certification, unscrupulous businesses could
    victimize consumers with impunity merely by tweaking the
    language in a telemarketing script or directing some (or all) of
    the telemarketers not to use a script at all but to simply orally
    convey a general theme designed to get access to personal
    information such as account numbers.
    We do not believe that our discussion of predominance
    in our prior cases intended to either license such behavior by
    placing it beyond the reach of Rule 23 or to supply a roadmap
    that would guide the unscrupulous in designing fraudulent
    schemes that would be beyond the reach of Rule 23.
    Otherwise, although such subtle but irrelevant variations in
    the manner of defrauding members of the public would not
    insulate unscrupulous marketers from liability in individual
    suits, it would -- for all practical purposes -- insulate them
    from class actions. An interpretation of Rule 23 that places
    class actions beyond the reach of consumers who have been
    victimized by fraudulent schemers who are wise enough to
    adopt schemes with subtle (but meaningless) variations would
    invite the kind of consumer fraud that Reyes is alleging here.
    Class actions are often the only practical check against
    the kind of widespread mass-marketing scheme alleged here.
    The individual claims arising from such conduct are usually
    too small to justify suit unless aggregated in a class action.
    This is particularly true when, as is often the case, the scheme
    targets unsophisticated consumers with little disposable
    income and without the means or wherewithal to seek
    32
    assistance of legal counsel. As a practical matter, the average
    victim of such a scheme nearly always finds it far easier --
    and much cheaper -- to reluctantly accept any loss and move
    on than to undertake the expense and inconvenience endemic
    in the protracted process of trying to recover a few dollars
    years later.
    A class action “permit[s] the plaintiffs to pool claims
    which would be uneconomical to litigate individually. . . .
    [M]ost of [such] plaintiffs would have no realistic day in
    court if a class action were not available.” Phillips Petroleum
    Co. v. Shutts, 
    472 U.S. 797
    , 809 (1985). “[C]onsumers have
    little interest in litigating their claims individually because of
    the small amount of money per plaintiff that is at stake.”
    
    Cabraser, supra, at 822
    (quotation marks omitted).
    Moreover, obtaining counsel to pursue such a claim is usually
    the height of impracticality -- even for those who can afford
    to do so. “What rational lawyer would have signed on to
    represent the [party] in litigation for the possibility of fees
    stemming from a $30.22 claim?” AT&T Mobility LLC v.
    Concepcion, 
    131 S. Ct. 1740
    , 1761 (2011) (Breyer, J.,
    dissenting).
    In such cases, the class action can “create[] greater
    access to judicial relief[.]” 
    Marcus, 687 F.3d at 594
    . “[I]t is[,
    in fact,] possible to think of consumer class actions as
    providing an indispensable mechanism for aggregating claims
    when the individual stake is low and the similarity of the
    challenged conduct is high.” Samuel Issacharoff, Group
    Litig. of Consumer Claims: Lessons from the U.S.
    Experience, 34 Tex. Int’l L.J. 135, 149 (1999).17 Thus, class
    actions have the practical effect of allowing plaintiffs who
    have suffered relatively de minimis loss to nevertheless
    function as private attorneys general and thereby deter fraud
    in the marketplace.
    17
    See Fed. R. Civ. P. 23 advisory committee’s note to
    the 1966 amendment (“[A] fraud perpetrated on numerous
    persons by the use of similar misrepresentations may be an
    appealing situation for a class action, and it may remain so
    despite the need, if liability is found, for separate
    determination of the damages suffered by individuals within
    the class.”).
    33
    The “complete sham” theory, if supported by an
    appropriate record, can satisfy the predominance prong of
    Rule 23(b)(3) by focusing on the overarching material and
    defining aspects of a defendant’s conduct. This allows a
    court to certify a class despite subtle (but meaningless)
    variations that may occur while perpetrating a fraudulent
    scheme. Thus, as Reyes contends “[u]ltimately, the question
    is the extent to which fraud can be shown to have been
    committed on the class by common evidence.” Appellant Br.
    at 64. On remand, the District Court should consider the
    entire record to determine if it supports that contention.
    Investigator Blake testified “each of the schemes at
    issue was a totally fraudulent mass-marketing fraud.” Blake
    Decl., JA 1613, ¶ 15. She concluded that these were all
    “precisely the kind of fundamentally fraudulent schemes that,
    in [her] experience, have been routinely adjudicated on the
    basis of common evidence of fraud.” 
    Id., JA 1627-28
    , ¶ 85.
    Professor Meyer reviewed the evidence and concluded that
    the proof of fraud was classwide. He identified four key
    features common to the way each telemarketer obtained bank
    account information and initiated debits from bank accounts.
    He concluded that although “these ‘products and programs’
    appear to vary, all had [those] four common features essential
    to their use as props in the scheme of deception[.]” Meyer
    Decl., JA 1639-40 ¶ 19. The court-appointed receiver for
    NHS Systems, Geisser, testified that NHS Systems was
    “totally fraudulent and that no consumer who . . . had money
    taken from their account was not injured in the amount of
    money taken from their account[.]” Geisser Dep., JA 1161.
    The District Court may consider that the defendants’
    experts offer little reason to conclude that predominance
    cannot be satisfied here. As noted above, Milner testified for
    the defendant. Milner did not agree that a return rate in
    excess of 10% was prima facie evidence of fraud. However,
    she also explained that pursuant to its Operating Rules,
    “NACHA gathers specific information concerning individual
    Originators with high rates of unauthorized returns . . . [and]
    may send the bank of an originator producing unauthorized
    returns in excess of 1% a written request for information
    34
    about specific originators.” Milner Decl., JA 3787, ¶ 25
    (citation and footnote omitted).
    Professor Boss testified that “the overwhelming
    majority of banks in the United States have no unauthorized
    returns at all . . . .” Boss Decl., JA 590 ¶ 82. Reyes focuses
    our attention on testimony that Zions Bank, like most U.S.
    banks, had no unauthorized returns in August of 2006. It then
    started working with its wholly-owned subsidiary, Modern
    Payments, and its unauthorized returns began to “immediately
    . . . increase dramatically from zero in August 2006 to 799 in
    October, [and] 2,095 to 2,632 by February 2007.” 
    Id., JA 587-88
    ¶ 78 (emphasis in original). As noted earlier, when
    adjusted for its size, Zions Bank had the highest rate of
    returns of any U.S. bank.
    Reyes also offers the following chart summarizing the
    evidence regarding the return rates of the telemarketers:
    Total Return Rates
    First     Total   Return Rate as a
    Average       Month      Months   Multiple of 2007
    Return       Return      With    National Average
    Fraud Scheme           Rate*         Rate*     Zions*       (1.25%)**
    NHS                            64.79%        51.90%       15             52
    RX Smart                       54.21%        42.00%        3             43
    Market Power Entities
    Market Power         86.73%      85.10%        11            69
    Payday loan          73.46%      70.98%        4             59
    Get Your Credit Rept 62.48%      55.94%        4             50
    Vexeldale            74.09%      70.52%        4             59
    Platinum Benefit Group          30.83%      37.98%        39            25
    Group 1 Entities                51.67%      65.41%        21            41
    Low Pay Inc                     68.83%      65.41%        10            55
    * JA 661                       ** JA 663
    Appellant Br. at 25 (footnote omitted).18
    18
    We are not, of course, suggesting that the District
    Court had to accept the conclusions in the chart or the expert
    testimony that the scheme here is susceptible to class
    treatment. That determination remains left to the sound
    discretion of the District Court. However, the District Court
    35
    The crux of the Rule 23(b)(3) predominance inquiry
    here is whether a preponderance of the evidence supports
    Reyes’ proposition that the defendants operated a complete
    sham, and whether an affirmative answer to that inquiry
    would establish the required element of predominance. Reyes
    claims that if the evidence supports such a finding by a
    preponderance of the evidence, the predominance
    requirement of Rule 23(b)(3) is satisfied, even though the
    telemarketers did not read from a uniform script or use the
    same method of defrauding each of the members of the
    putative class. Appellant Br. at 62-63 (distinguishing this
    case from In re LifeUSA Holding, Incorporated and Johnston
    because there is a “question about the legitimacy of the
    [entity] itself[]” in which Reyes alleges the existence of one
    “systematic fraud”).
    As we have reiterated, Reyes argues the District Court
    erred in relying only on high return rates to deny class
    certification. As detailed above, Reyes also introduced proof
    of the structure of each of the schemes and FTC
    investigations. In particular, Reyes points to “broader
    eviden[ce] . . . includ[ing] three experts (all of whom opined
    that the underlying mass-marketing schemes were completely
    fraudulent), the related government proceedings, Mr.
    Geisser’s testimony, and a wealth of documentary evidence
    and deposition testimony reflecting Defendants’ knowledge
    of the fraud they were furthering.” 
    Id. at 54.19
    According to
    is not free to simply ignore such testimony without explaining
    why it is rejecting it. That is the antithesis of the thorough
    and rigorous inquiry that the law demands at the certification
    stage.
    19
    See also Appellant Reply Br. at 9-12 (discussing
    additional evidence, including “internal bank documents
    showing that Defendants were aware that they were providing
    services to frauds,” warnings from regulators, other banks,
    and employees “directly inform[ing] [the defendants] that
    they were carrying out transactions for frauds[,]” expert
    testimony, testimony from Geisser, “documents and
    declarations from both regulatory actions that identified each
    of the mass-marketing entities as frauds and those that
    36
    Reyes, the “evidence [presented about the fraudulent
    companies] applies to the class as a whole, [therefore] the
    jury’s consideration of th[e] evidence would apply to each
    class member’s claim.” 
    Id. at 37.
    If accepted, the District
    Court may conclude that this evidence supports a finding that
    there was a single fraudulent RICO enterprise, that each
    defendant participated in that enterprise, and that all members
    of the proposed class were damaged in the amount of the
    funds debited from their bank accounts pursuant to the
    fraudulent scheme. We leave it for the District Court to
    assess this on remand.
    Reyes further asserts that the District Court could have
    specified subclasses for each defendant if it were concerned
    about proving fraud with respect to each entity. Id.;
    Appellant Reply Br. at 6 n.4. On remand, to the extent that
    ordered complete restitution of their victims[,]” data
    demonstrating the “explo[sion]” of unauthorized returns
    following the formation of the alleged RICO enterprise, and
    “documents showing that Defendants closely monitored the
    entities’ extreme return rates—which they openly
    acknowledged were staggering[.]” (citations and quotation
    marks omitted)).
    In mentioning this evidence, we in no way suggest that
    we agree with the District Court’s conclusion that evidence of
    high return rates cannot establish fraud on this record. We
    refrain from concluding that return rates can never be prima
    facie evidence of fraud or knowledge of fraud, no matter how
    much they vary from industry norms. See Blake Decl., JA
    1612-13 ¶ 14.d (“The schemes at issue here involve unusually
    high numbers of returns even compared to other fraudulent
    schemes I have investigated. It is therefore highly likely that
    most of these schemes engaged in what is commonly known
    as ‘slamming.’”); Boss Decl., JA 587-88, 590 ¶¶ 78, 82
    (“Anyone in possession of the[] facts [about the return rates]
    would have to have known fraud was involved. . . . It is
    obvious that the high rates of unauthorized returns are
    indicative of fraudulent activity by these companies.”); Meyer
    Decl., JA 1637-38 ¶¶ 12.a, 14 (“For there to be such high
    return rates there had to be fraud involved. . . . I conclude
    with reasonable certainty that the return rates alone establish
    that each of the entities at issue was fraudulent.”).
    37
    the District Court is concerned with the commonality and
    predominance requirements because of variations in the way
    the affairs of the allegedly fraudulent enterprise was
    conducted, it can consider whether Reyes’ proposed
    subclasses would adequately address those concerns. Fed. R.
    Civ. P. 23(c)(5), (d); see also Neale, 
    2015 WL 4466919
    , at
    *15 (“[T]he District Court should evaluate the relevant claims
    (grouping them where logical and appropriate) and rule on the
    predominance [and commonality] question[s] in light of the
    claims asserted and the available evidence.” (citation
    omitted)); Tobias Barrington Wolff, Discretion in Class
    Certification, 162 U. Pa. L. Rev. 1897, 1898 (2014)
    (“[D]istrict courts sometimes exercise discretion in defining
    the parameters of the class definition and deciding when
    subclasses are necessary, often acting independently of any
    proposals made by the parties.” (footnote omitted)).20 We
    note, however, “[t]he court has no sua sponte obligation so to
    act.” U.S. Parole Comm’n v. Geraghty, 
    445 U.S. 388
    , 408
    (1980). “[I]t is not the District Court that is to bear the
    burden of constructing subclasses. That burden is upon the
    [plaintiff] . . . who is required to submit proposals to the
    court.” 
    Id. As we
    have already explained, Reyes is correct in
    asserting that the District Court erred when it “examined one
    piece of evidence -- the mass-marketers’ extreme return rates
    -- and concluded that these rates alone were not ‘absolute
    proof’ of fraud.” Appellant Br. at 37. The law does not
    permit a district court to only consider and analyze the “most
    significant evidence[.]” Reyes, 
    2013 WL 5332107
    , at *2.
    Rather, the trial court must consider “all relevant evidence
    and arguments, including relevant expert testimony of the
    parties [unless there is a reason to reject certain testimony].”
    In re Hydrogen Peroxide Antitrust 
    Litig., 552 F.3d at 325
    (emphasis added); see also In re Blood Reagents Antitrust
    Litig., 
    783 F.3d 183
    , 187 (3d Cir. 2015). Moreover, as we
    have also explained, we do not require “absolute proof.”
    Indeed, such a burden would be prohibitive, as few things are
    capable of absolute proof that removes all possibility of
    20
    For a very thorough development of the evolution of
    discretion under Rule 23, see Wolff, Discretion in Class
    Certification, 162 U. Pa. L. Rev. at 1911-39.
    38
    doubt. Here, the District Court’s analysis singled out the
    “most significant evidence” (return rates) and then improperly
    applied a heightened standard to that evidence while ignoring
    all of the other testimony.
    However, there is an even more fundamental flaw in
    the District Court’s analysis. The District Court relied on fact
    witnesses while ignoring expert testimony, and confused the
    testimony of the witnesses it did consider.21 As noted above,
    Reyes presented declarations from three expert witnesses:
    Professors Boss and Meyer, and Investigator Blake.
    However, the District Court failed to mention, let alone
    closely scrutinize, any of Reyes’ experts. See Amchem
    Products, 
    Inc., 521 U.S. at 615
    -16 (referring to the trial
    court’s “close look” before finding predominance and
    superiority); In re Hydrogen Peroxide Antitrust 
    Litig., 553 F.3d at 320
    (“[A] district court errs as a matter of law when it
    fails to resolve a genuine legal or factual dispute relevant to
    determining the requirements.”). The District Court then
    referred to Geisser and Fox as Reyes’ expert witnesses.
    Reyes, 
    2013 WL 5332107
    , at *7. Geisser and Fox were not
    expert witnesses, but fact witnesses. Geisser was installed as
    the NHS Systems receiver after the FTC obtained a
    preliminary injunction against NHS Systems; Fox was a
    senior director of risk investigation at NACHA. Appellant
    Br. at 10, 12, 26.
    Perhaps because it confused their role and expertise,
    the District Court relied on a concession by the fact witnesses
    to justify limiting its analysis to evidence of high return rates.
    Reyes, 
    2013 WL 5332107
    , at *7 (relying on Geisser’s
    concession and Fox’s silence to conclude that the high return
    rates are not dispositive of fraud). However, not only did
    Reyes’ expert witnesses fail to make this concession, Blake
    Decl., JA 1612-13 ¶ 14.d; Boss Decl., JA 587-88, 590 ¶¶ 78,
    82; Meyer Decl., JA 1637-38 ¶¶ 12.a, 14, they also based
    their conclusions on the additional evidence discussed above.
    21
    Much of the confusion here is understandable. The
    District Court inherited the rather voluminous record in this
    case from another judge.
    39
    The defendants correctly remind us that “[d]istrict
    courts are not required under Hydrogen Peroxide, or any
    other authority, to cite specifically to the declarations of every
    expert or every other piece of evidence relevant to class
    certification merely to prove that they were considered in its
    rigorous analysis of the Rule 23 requirements.” Appellee Br.
    at 32-33 (emphasis in original) (citations omitted). That is
    undoubtedly true.        However, a “rigorous analysis” is
    nevertheless mandated, and the defendants do not contest
    that.
    Quite obviously, an analysis of testimony that refers to
    individuals as expert witnesses when they are merely fact
    witnesses and confuses one party’s fact witnesses with
    experts, while not correctly citing any expert testimony, is
    inconsistent with the demanding scrutiny required under Rule
    23. “[T]he court’s obligation to consider all relevant
    evidence and arguments extends to expert testimony, whether
    offered by a party seeking class certification or by a party
    opposing it.” In re Hydrogen Peroxide Antitrust 
    Litig., 552 F.3d at 307
    (emphasis added).
    We have not required a district court to refer to, or cite,
    every expert that either party presents and we do not do so
    now.22 Rather, we merely apply the holding of In re
    Hydrogen Peroxide Antitrust Litigation: “[T]he district court
    must make whatever factual and legal inquiries are necessary
    and must consider all relevant evidence and arguments
    presented by the 
    parties.” 552 F.3d at 307
    (emphasis added)
    (citation omitted).23
    The defendants argue that the District Court’s
    mistaken reference to fact witnesses as Reyes’ experts did not
    22
    See, e.g., 
    Marcus, 687 F.3d at 603
    (failing to
    interpret In re Hydrogen Peroxide Antitrust Litigation as
    requiring a district court to explicitly discuss every expert
    opinion).
    23
    As we have explained above, In re Hydrogen
    Peroxide Antitrust Litigation merely “emphasize[s] the need
    for a careful, fact-based approach, informed, if necessary, by
    
    discovery.” 552 F.3d at 326
    .
    40
    result in an abuse of discretion because the District Court
    addressed the key arguments that each of Reyes’ experts
    made. This record belies that argument. The District Court
    merely focused on high return rates, without more. Reyes,
    
    2013 WL 5332107
    , at *7-8. Not only did the District Court
    minimize the probative value of that evidence by requiring
    absolute proof of fraud, thereby undermining its relevance to
    the requirements of Rule 23(a) and Rule 23(b)(3), it also
    failed to confront Reyes’ experts’ arguments on the
    importance of the return rates. See, e.g., Boss Decl., JA 582-
    92 ¶¶ 66-87; Meyer Decl., JA 1637-38 ¶ 12.b. Further, as
    discussed above, the District Court failed to confront Reyes’
    experts’ arguments of “clear indications of fraud[]” based on
    more than return rates. Boss Decl., JA 587 ¶ 77. See, e.g.,
    Blake Decl., JA 1613 ¶ 15; Boss Decl., JA 592 ¶ 87; Meyer
    Decl., JA 1639 ¶ 18.24
    A district court errs as a matter of law when it confuses
    testimony, as the District Court did here, and fails to carefully
    scrutinize the relevant, disputed testimony.25
    III.   CONCLUSION
    For the reasons set forth above, we will vacate the
    order denying class certification and remand for proceedings
    consistent with this opinion.
    24
    Amici remind us that Milner testified that
    “transactions may be returned to a merchant under 68
    different return codes, each of which has a different definition
    and covers different return scenarios. None of these codes are
    defined to identity fraud.” American Bankers Ass’n & Indep.
    Cmty. Bankers of America Br. at 5. That does not negate the
    force of the evidence of rate of return of each of the defendant
    merchants here. It is fair to assume that similarly situated
    banks would generally have roughly equivalent return rates.
    Indeed the testimony here supports that assumption.
    25
    We may have a different situation if the District
    Court quoted the expert witnesses, but mistakenly referred to
    them as fact witnesses. That is not what happened. Here, we
    have the fact witnesses’ arguments and names, not the
    experts’.
    41