Task: sc_lcdisposition

What follows is an opinion from the Supreme Court of the United States. Your task is to determine the treatment the court whose decision the Supreme Court reviewed accorded the decision of the court it reviewed, that is, whether the court below the Supreme Court (typically a federal court of appeals or a state supreme court) affirmed, reversed, remanded, denied or dismissed the decision of the court it reviewed (typically a trial court). Adhere to the language used in the "holding" in the summary of the case on the title page or prior to Part I of the Court's opinion. Exceptions to the literal language are the following: where the Court overrules the lower court, treat this a petition or motion granted; where the court whose decision the Supreme Court is reviewing refuses to enforce or enjoins the decision of the court, tribunal, or agency which it reviewed, treat this as reversed; where the court whose decision the Supreme Court is reviewing enforces the decision of the court, tribunal, or agency which it reviewed, treat this as affirmed; where the court whose decision the Supreme Court is reviewing sets aside the decision of the court, tribunal, or agency which it reviewed, treat this as vacated; if the decision is set aside and remanded, treat it as vacated and remanded.

Justice Souter
delivered the opinion of the Court.
Respondent Construction Laborers Pension Trust for Southern California (Plan) is a multiemployer pension trust fund established under a Trust Agreement executed in 1962. Petitioner Concrete Pipe and Products of California, Inc. (Concrete Pipe), is an employer and former contributor to the Plan that withdrew from it and was assessed “withdrawal liability” under provisions of the Employee Retirement Income Security Act of 1974 (ERISA), 29 U. S. C. §§1301-1461 (1988 ed. and Supp. III), added by the Multiemployer Pension Plan Amendments Act of 1980 (MPPAA), Pub. L. 96-364, 94 Stat. 1208. Concrete Pipe contends that the MPPAA’s assessment and arbitration provisions worked to deny it procedural due process. And, although we have upheld the MPPAA against constitutional challenge under the substantive component of the Due Process Clause and the Takings Clause, Pension Benefit Guaranty Corporation v. R. A. Gray & Co., 467 U. S. 717 (1984); Connolly v. Pension Benefit Guaranty Corporation, 475 U. S. 211 (1986), Concrete Pipe contends that, as applied to it, the MPPAA violates these provisions as well. We see merit in none of Concrete Pipe’s contentions.
I
A pension plan like the one in issue, to which more than one employer contributes, is characteristically maintained to fulfill the terms of collective-bargaining agreements. The contributions made by employers participating in such a multiemployer plan are pooled in a general fund available to pay any benefit obligation of the plan. To receive benefits, an employee participating in such a plan need not work for one employer for any particular continuous period. Because service credit is portable, employees of an employer participating in the plan may receive such credit for any work done for any participating employer. An employee obtains a vested right to secure benefits upon retirement after accruing a certain length of service for participating employers; benefits vest under the Plan in this case when an employee accumulates 10 essentially continuous years of credit. See Brief for Petitioner 28.
Multiemployer plans like the one before us have features that are beneficial in industries where
“there [is] little if any likelihood that individual employers would or could establish single-employer plans for their employees...[,] where there are hundreds and perhaps thousands of small employers, with countless numbers of employers going in and out of business each year, [and where] the nexus of employment has focused on the relationship of the workers to the union to which they belong, and/or the industry in which they are employed, rather than to any particular employer.” Multiemployer Pension Plan Termination Insurance Program: Hearings before the Subcommittee on Oversight of the House Committee on Ways and Means, 96th Cong., 1st Sess., 50 (1979) (statement of Robert A. Georgine, Chairman, National Coordinating Committee for Multiemployer Plans).
Multiemployer plans provide the participating employers with such labor market benefits as the opportunity to offer a pension program (a significant part of the covered employees’ compensation package) with cost and risk-sharing mechanisms advantageous to the employer. The plans, in consequence, help ensure that each participating employer will have access to a trained labor force whose members are able to move from one employer and one job to another without losing service credit toward pension benefits. See 29 CFR § 2530.210(c)(1) (1991); accord, Washington Star Co. v. International Typographical Union Negotiated Pension Plan, 582 F. Supp. 301, 304 (DC 1983).
Since the enactment of ERISA in 1974, the Plan has been subject to the provisions of the statute as a “defined benefit plan.” Such a plan is one that does not qualify as an “ ‘individual account plan’ or ‘defined contribution plan/” which provide, among other things, for an individual account for each covered employee and for benefits based solely upon the amount contributed to the covered employee’s account. See 29 U. S. C. §§ 1002(35), 1002(34), 1002(7). Concrete Pipe has not challenged the determination that the Plan falls within the statutory definition of defined benefit plan, and no issue as to that is before the Court.
A
We have canvassed the history of ERISA and the MPPAA before. See Pension Benefit Guaranty Corporation v. R. A. Gray & Co., supra; Connolly v. Pension Benefit Guaranty Corporation, supra. ERISA was designed “to ensure that employees and their beneficiaries would not be deprived of anticipated retirement benefits by the termination of pension plans before sufficient funds have been accumulated in [them].... Congress wanted to guarantee that if a worker has been promised a defined pension benefit upon retirement — and if he has fulfilled whatever conditions are required to obtain a vested benefit — he will actually receive it.” Id., at 214 (citations and internal quotation marks omitted). As enaeted in 1974, ERISA created the Pension Benefit Guarantee Corporation (PBGC) to administer and enforce a pension plan termination insurance program, to which contributors to both single-member and multiemployer plans were required to pay insurance premiums. 29 U. S. C. §§ 1302(a), 1306 (1988 ed. and Supp. III). Under the terms of the statute as originally enacted, the guarantee of basic benefits by multiemployer plans that terminated was not to be mandatory until 1978, and for terminations prior to that time, any guarantee of benefits upon plan termination was discretionary with PBGC. 29 U. S. C. §§ 1381(c)(2)-(4) (1976 ed.). If PBGC did choose to extend a guarantee when a multiemployer plan terminated with insufficient assets to pay promised benefits, an employer that had contributed to the plan in the five preceding years was liable to PBGC for the shortfall in proportion to its share of contributions during that 5-year period, up to 30 percent of the employer’s net worth. 29 U. S. C. §§ 1362(b), 1364 (1976 ed.). “In other words, any employer withdrawing from a multiemployer plan was subject to a contingent liability that was dependent upon the plan’s termination in the next five years and the PBGC’s decision to exercise its discretion and pay guaranteed benefits.” Gray, 467 U. S., at 721.
“As the date for mandatory coverage of multiemployer plans approached, Congress became concerned that a significant number of plans were experiencing extreme financial hardship.” Ibid. Indeed, the possibility of liability upon termination of a plan created an incentive for employers to withdraw from weak multiemployer plans. Connolly, 475 U. S., at 215. The consequent risk to the insurance system was unacceptable to Congress, which in 1978 postponed the mandatory guarantee pending preparation by the PBGC of a report “analyzing the problems of multiemployer plans and recommending possible solutions.” Ibid. PBGC issued that report on July 1, 1978. Pension Benefit Guaranty Corporation, Multiemployer Study Required by P. L. 95-214 (1978). “To alleviate the problem of employer withdrawals, the PBGC suggested new rules under which a withdrawing employer would be required to pay whatever share of the plan’s unfunded liabilities was attributable to that employer’s participation.” Connolly, 475 U. S., at 216 (citation and internal quotation marks omitted).
Congress ultimately agreed, see id., at 217, and passed the MPPAA, which was signed into law by the President on September 26, 1980. Under certain provisions of the MPPAA (which when enacted had an effective date of April 29, 1980, 29 U. S. C. § 1461(e)(2)(A) (1976 ed., Supp. V)), if an employer withdraws from a multiemployer plan, it incurs “withdrawal liability” in the form of “a fixed and certain debt to the pension plan.” Gray, supra, at 725. An employer’s withdrawal liability is its “proportionate share of the plan’s ‘unfunded vested benefits,’ ” that is, “the difference between the present value of vested benefits” (benefits that are currently being paid to retirees and that will be paid in the future to covered employees who have already completed some specified period of service, 29 U. S. C. § 1053) “and the current value of the plan’s assets. 29 U. S. C. §§ 1381,1391.” Gray, supra, at 725.
B
The MPPAA provides the procedure for calculating and assessing withdrawal liability. The plan’s actuary, who is subject to regulatory and professional standards, 29 U. S. C. §§1241, 1242; 26 U. S. C. § 7701(a)(35), must determine the present value of the plan’s liability for vested benefits. In the absence of regulations promulgated by the PBGC, the actuary must employ “actuarial assumptions and methods which, in the aggregate, are reasonable (taking into account the experience of the plan and reasonable expectations) and which, in combination, offer the actuary’s best estimate of anticipated experience under the plan.” 29 U. S. C. § 1393(a)(1). The assumptions must cover such matters as mortality of covered employees, likelihood of benefits vesting, and, importantly, future interest rates. After settling the present value of vested benefits, the actuary calculates the unfunded portion by deducting the value of the plan’s assets. § 1393(c).
In order to determine a particular employer’s withdrawal liability, the unfunded vested liability is allocated under one of several methods provided by law. § 1391. In this case, the Plan used the presumptive method of § 1391(b), which bases withdrawal liability on the proportion of total employer contributions to the plan made by the withdrawing employer during certain 5-year periods. See §§ 1391(b)(2) (E)(ii), (b)(3)(B), (b)(4)(D)(ii). In essence, the withdrawal liability imposes on the withdrawing employer a share of the unfunded vested liability proportional to the employer’s share of contributions to the plan during the years of its participation.
Withdrawal liability is assessed in a notification by the “plan sponsor” (here the trustees, see § 1301(a)(10)(A)) and a demand for payment. § 1399(b). The statute requires notification and demand to be made “[a]s soon as practicable after an employer’s complete or partial withdrawal.” § 1399(b)(1). A “complete withdrawal”
“occurs when an employer—
“(1) Permanently ceases to have an obligation to contribute under the plan, or
“(2) permanently ceases all covered operations under the plan.” § 1383(a).
“[T]he date of a complete withdrawal is the date of the cessation of the obligation to contribute or the cessation of covered operations.” § 1383(e).
The statute provides that if an employer objects after notice and demand for withdrawal liability, and the parties cannot resolve the dispute, § 1399(b)(2), it shall be referred to arbitration. See § 1401(a)(1). Two presumptions may attend the arbitration. First, “any determination made by a plan sponsor under [29 U. S. C. §§ 1381-1399 and 1405 (1988 ed. and Supp. III)] is presumed correct unless the party contesting the determination shows by a preponderance of the evidence that the determination was unreasonable or clearly erroneous.” 29 U. S. C. § 1401(a)(3)(A). Second, the sponsor’s calculation of a plan’s unfunded vested benefits
“is presumed correct unless a party contesting the determination shows by a preponderance of evidence that—
“(i) the actuarial assumptions and methods used in the determination were, in the aggregate, unreasonable (taking into account the experience of the plan and reasonable expectations), or
“(ii) the plan’s actuary made a significant error in applying the actuarial assumptions or methods.” § 1401(a) (3)(B).
The statute provides for judicial review of the arbitrator’s decision by an action in the district court to enforce, vacate, or modify the award. See § 1401(b)(2). In any such action “there shall be a presumption, rebuttable only by a clear preponderance of the evidence, that the findings of fact made by the arbitrator were correct.” § 1401(c).
II
The parties to the Trust Agreement creating the Plan in 1962 are the Southern California District Council of Laborers (Laborers) and three associations of contractors, the Building Industry of California, Inc., the Engineering Contractors Association, and the Southern California Contractors Association, Inc. App. 75, ¶ 6 (stipulation of facts filed in the District Court). Under § 302(c)(5)(B) of the Labor Management Relations Act, 1947 (LMRA), 29 U. S. C. § 186(c)(5)(B), when a union participates in management of a plan permitted by the LMRA, the plan must be administered jointly by representatives of labor and management. Accordingly, half of the Plan’s trustees are selected by the Laborers, and half by these contractors’ associations. Concrete Pipe has never been a member of any of the contractors’ associations that are parties to the Trust Agreement.
In 1976, Concrete Pipe, which is a wholly owned subsidiary of Concrete Pipe and Products Co., Inc., purchased certain assets of another company, Cen-Vi-Ro, including a concrete pipe manufacturing plant near Shafter, California, which Concrete Pipe continued to operate much as Cen-Vi-Ro had done. Cen-Vi-Ro had collective-bargaining agreements with several unions including the Laborers, and Concrete Pipe abided by the agreement with the latter by contributing to the Plan at a specified rate for each hour worked by a covered employee. In 1978, Concrete Pipe negotiated a new 3-year contract with the Laborers that called for continuing contributions to be made to the Plan based on hours worked by covered employees in the collective-bargaining unit. The collective-bargaining agreement specified that it would remain in effect until June 30, 1981, and thereafter from year to year unless either Concrete Pipe or the Laborers gave notice of a desire to renegotiate or terminate it. “‘Such written notice [was to] be given at least sixty (60) days prior to June 30... [and if] no agreement [was] reached by June 30... the Employer or the [Laborers might] thereafter give written notice to the other that on a specified date [at least] fifteen (15) days [thereafter] the Agreement [should] be considered terminated.’ ” App. 76.
In August 1979, Concrete Pipe stopped production at the Shatter facility. Although the details do not matter here, by October 1979, work by employees covered by the agreement with the Laborers had virtually ceased, and Concrete Pipe eventually stopped making contributions to the Plan. In the spring of 1981, Concrete Pipe and the Laborers each sent the other a timely notice of a desire to renegotiate the collective-bargaining agreement. Concrete Pipe subsequently bargained to an impasse and, on November 30, 1981, sent the Laborers a letter withdrawing recognition of that union as an employee representative, and giving notice of intent to terminate the 1978 collective-bargaining agreement. At about the same time, however, in November 1981, Concrete Pipe reopened the Shafter plant to produce 7,000 tons of concrete pipe needed to fill two orders for which it had successfully bid. It hired employees in classifications covered by its prior agreement with the Laborers, but did not contribute to the Plan for their work.
In January 1982, the Plan notified Concrete Pipe of withdrawal liability claimed to amount to $268,168.81. See id., at 89-94. Although the demand letter did not specify the date on which the Plan contended that “complete withdrawal” from it had taken place, it referred to the failure of Concrete Pipe to make contributions to the Plan since February 1981, and stated that “[w]e are further advised that you have not signed a renewal of a collective bargaining agreement obligating you to continue contributions to the Plan on behalf of the Construction laborers currently in your employ.” Id., at 90.
The Plan filed suit seeking the assessed withdrawal liability. Concrete Pipe countersued to bar collection, contending that “complete withdrawal” had occurred when operations at the Shatter plant ceased in August 1979, a date prior to the effective date of the MPPAA, and challenging the MPPAA on constitutional grounds. These cases were consolidated in the United States District Court for the Central District of California, which sua sponte ordered the parties to arbitrate the issue of whether withdrawal occurred prior to the effective date of the MPPAA.
The arbitration took place in two phases. In the first, the arbitrator determined that Concrete Pipe had not withdrawn from the Plan prior to the effective date of the MPPAA. App. 216. In the second phase, explicitly applying the presumption of 29 U. S. C. § 1401(a)(3)(B), the arbitrator found that Concrete Pipe had failed to meet its burden of showing the actuarial assumptions and methods to be unreasonable in the aggregate. App. 400. For reasons not at issue here, the arbitrator did rule partially in Concrete Pipe’s favor, and reduced the withdrawal liability from $268,168.81 to $190,465.57.
Concrete Pipe then filed a third action in the District Court, to set aside or modify the arbitrator’s decision, and again raised its constitutional challenge. Id., at 406. The District Court treated Concrete Pipe’s subsequent motion for summary judgment as a petition to vacate the arbitrator’s award, which it denied, and granted a motion by the Plan to confirm the award. Construction Laborers Pension Trust for Southern California v. Cen-Vi-Ro Concrete Pipe and Products, CV-82-5184-HLH (CD Cal., July 5, 1989), App. 416-425. On Concrete Pipe’s appeal, the judgment of the District Court was affirmed. Board of Trustees of Construction Laborers Pension Trust for Southern California v. Concrete Pipe and Products of California, Inc., No. 89-55854 (CA9, June 27, 1991), App. 431-432, judgt. order reported at 936 F. 2d 576. We granted certiorari limited to two questions presented, which are set out in the margin. 504 U. S. 940 (1992).
Ill
Concrete Pipe challenges the assessment of withdrawal liability on several grounds, the first being that by placing determination of withdrawal liability in the trustees, subject to the presumptions provided by § 1401, the MPPAA is unconstitutional because it denies Concrete Pipe an impartial adjudicator. This is not the first time this legal question has been before the Court. See Pension Benefit Guaranty Corporation v. Yahn & McDonnell, Inc., 481 U. S. 735 (1987), aff’g by an equally divided Court United Retail & Wholesale Employees Teamsters Union Local No. 115 Pension Plan v. Yahn & McDonnell, Inc., 787 F. 2d 128 (CA3 1986).
A
1
Concrete Pipe and its amici point to several potential sources of trustee bias toward imposing the greatest possible withdrawal liability. The one they emphasize most strongly has roots in the fact that “all of the trustees, including those selected by employers, are fiduciaries of the fund, 29 U. S. C. § 1002(21)([A]), and thus owe an exclusive duty to the fund.” Id., at 139 (emphasis omitted). As we said in another case discussing employee benefit pension plans permitted under LMRA:
“Under principles of equity, a trustee bears an unwavering duty of complete loyalty to the beneficiary of the trust, to the exclusion of the interests of all other parties. To deter the trustee from all temptation and to prevent any possible injury to the beneficiary, the rule against a trustee dividing his loyalties must be enforced with ‘uncompromising rigidity.’
“In sum, the duty of the management-appointed trustee of an employee benefit fund under § 302(c)(5) is directly antithetical to that of an agent of the appointing party.... ERISA essentially codified the strict fiduciary standards that a § 302(c)(5) trustee must meet. [Title 29 U. S. C. § 1104(a)(1)] requires a trustee to ‘discharge his duties... solely in the interest of the participants [i. e., covered employees] and beneficiaries.’” NLRB v. Amax Coal Co., 453 U. S. 322, 329-332 (1981) (citations and footnote omitted).
The resulting tug away from the interest of the employer is fueled by the threat of personal liability for any breach of the trustees’ fiduciary responsibilities, obligations, or duties, 29 U. S. C. § 1109, which may be enforced by civil actions brought by the Secretary of Labor or any covered employee or beneficiary of the plan, § 1132(a)(2).
The trustees could act in a biased fashion for several reasons. The most obvious would be in attempting to maximize assets available for the beneficiaries of the trust by making findings to enhance withdrawal liability. The next would not be so selfless, for if existing underfunding was the consequence of prior decisions of the trustees, those decisions could, if not offset, leave the trustees open to personal liability. See Brief for American Trucking Associations, Inc., as Amicus Curiae 9. A risk of bias may also inhere in the mere fact that, fiduciary obligations aside, the trustees are appointed by the unions and by employers. Union trustees may be thought to have incentives, unrelated to the question of withdrawal, to impose greater rather than lesser withdrawal liability. Employer trustees may be responsive to concerns -of those employers who continue to contribute, whose future burdens may be reduced by high withdrawal liability, and whose competitive position may be enhanced to boot. See Brief for Midwest Motor Express, Inc., et al. as Amici Curiae 8, citing Note, Trading Fairness for Efficiency: Constitutionality of the Dispute Resolution Procedures of the Multiemployer Pension Plan Amendments Act of 1980, 71 Geo. L. J. 161, 168 (1982).
As against these supposed threats to the trustees’ neutrality, due process requires a “neutral and detached judge in the first instance,” Ward v. Village of Monroeville, 409 U. S. 57, 61-62 (1972), and the command is no different when a legislature delegates adjudicative functions to a private party, see Schweiker v. McClure, 456 U. S. 188, 195 (1982). “That officers acting in a judicial or quasi-judicial capacity are disqualified by their interest in the controversy to be decided is, of course, the general rule.” Tumey v. Ohio, 273 U. S. 510, 522 (1927). Before one may be deprived of a protected interest, whether in a criminal or civil setting, see Marshall v. Jerrico, Inc., 446 U. S. 238, 242, and n. 2 (1980), one is entitled as a matter of due process of law to an adjudicator who is not in a situation “ ‘which would offer a possible temptation to the average man as a judge... which might lead him not to hold the balance nice, clear and true....” Ward, supra, at 60 (quoting Tumey, supra, at 532). Even appeal and a trial de novo will not cure a failure to provide a neutral and detached adjudicator. 409 U. S., at 61.
“[J]ustice,” indeed, “must satisfy the appearance of justice, and this stringent rule may sometimes bar trial [even] by judges who have no actual bias and who would do their very best to weigh the scales of justice equally between contending parties.” Marshall v. Jerrico, Inc., supra, at 243 (citations and internal quotation marks omitted). This, too, is no less true where a private party is given statutory authority to adjudicate a dispute, and we will assume that the possibility of bias, if only that stemming from the trustees’ statutory role and fiduciary obligation, would suffice to bar the trustees from serving as adjudicators of Concrete Pipe’s withdrawal liability.
2
The assumption does not win the case for Concrete Pipe, however, for a further strand of governing law has to be applied. Not all determinations affecting liability are adjudicative, and the “ ‘rigid requirements’... designed for officials performing judicial or quasi-judicial functions, are not applicable to those acting in a prosecutorial or plaintiff-like capacity.” 446 U. S., at 248. Where an initial determination is made by a party acting in an enforcement capacity, due process may be satisfied by providing for a neutral adjudicator to “conduct a de novo review of all factual and legal issues.” Cf. id., at 245; see also id., at 247-248, and n. 9; cf. Withrow v. Larkin, 421 U. S. 35, 58 (1975) (“Clearly, if the initial view of the facts based on the evidence derived from nonadversarial processes as a practical or legal matter foreclosed fair and effective consideration at a subsequent adversary hearing leading to ultimate decision, a substantial due process question would be raised”).
The distinction between adjudication and enforcement disposes of the claim that the assumed bias or appearance of bias in the trustees’ initial determination of withdrawal liability alone violates the Due Process Clause, much as it did the similar claim in Marshall v. Jerrico. Although we were faced there with a federal agency administrator who determined violations of a child labor law and assessed penalties under the statute, we concluded that the administrator could not be held to the high standards required of those “whose duty it is to make the final decision and whose impartiality serves as the ultimate guarantee of a fair and meaningful proceeding in our constitutional regime.” 446 U. S., at 250. Of the administrator there we said, “He is not a judge. He performs no judicial or quasi-judicial functions. He hears no witnesses and rules on no disputed factual or legal questions. The function of assessing a violation is akin to that of a prosecutor or civil plaintiff.” Id., at 247.
This analysis applies with equal force to the trustees, who, we find, act only in an enforcement capacity. The statute requires the plan sponsor, here the trustees, to notify the employer of the amount of withdrawal liability and to demand payment, 29 U. S. C. § 1399(b)(1), actions that bear the hallmarks of an assessment, not an adjudication. The trustees are not required to hold a hearing, to examine witnesses, or to adjudicate the disputes of contending parties on matters of fact or law. In Marshall, we observed that an employer “excepting] to a penalty... is entitled to a de novo hearing before an administrative law judge,” 446 U. S., at 247, and we concluded that this latter proceeding was the “initial adjudication,” id., at 247, n. 9. Likewise here, we conclude that the first adjudication is the proceeding that occurs before the arbitrator, not the trustees’ initial determination of liability.
B
This does not end our enquiry, however, for Concrete Pipe goes on to argue that the statutory presumptions preserve the trustees’ bias by limiting the arbitrator’s autonomy to determine withdrawal liability, and thereby work to deny the employer a fair adjudication.
1
Under the first provision at issue here, “any determination made by the plan sponsor under [29 U. S. C. §§ 1381-1399 and 1405] is presumed correct unless the party contesting the determination shows by a preponderance of the evidence that the determination was unreasonable or clearly erroneous.” 29 U. S. C. § 1401(a)(3)(A). Concrete Pipe argues that this presumption denied it an impartial adjudicator on the issue of its withdrawal date, thus raising a constitutional question on which the Courts of Appeals have divided.
The parties apparently agree that this presumption applies only to factual determinations, see Reply Brief for Petitioner 17; Brief for Respondent 24 (deferring to brief for the PBGC as amicus curiae); Brief for Pension Benefit Guaranty Corporation as Amicus Curiae 10, and n. 11, and this position is consistent with a PBGC regulation requiring the arbitrator “[i]n reaching his decision [to] follow applicable law, as embodied in statutes, regulations, court decisions, interpretations of the agencies charged with the enforcement of the Act, and other pertinent authorities,” 29 CFR § 2641.4(a)(1) (1992). We will assume for purposes of this ease that the regulation reflects a sound reading of the statute.
a
It is clear that the presumption favoring determinations of the plan sponsor shifts a burden of proof or persuasion to the employer. The hard question is what the employer must show under the statute to rebut the plan sponsor’s factual determinations, that is, how and to what degree of probability the employer must persuade the arbitrator that the sponsor was wrong. The question is hard because the statutory text refers to three different concepts in identifying this burden: “preponderance,” “clearly erroneous,” and “unreasonable.”
The burden of showing something by a “preponderance of the evidence,” the most common standard in the civil law, “simply requires the trier of fact ‘to believe that the existence of a fact is more probable than its nonexistence before [he] may find in favor of the party who has the burden to persuade the [judge] of the fact’s existence.’” In re Winship, 397 U. S. 358, 371-372 (1970) (Harlan, J., concurring) (brackets in original) (citation omitted). “A finding is ‘clearly erroneous’ when although there is evidence to support it, the reviewing [body] on the entire evidence is left with the definite and firm conviction that a mistake has been committed.” United States v. United States Gypsum Co., 333 U. S. 364, 395 (1948). A showing of “unreasonableness” would require even greater certainty of error on the part of a reviewing body. See, e.g., Anderson v. Liberty Lobby, Inc., 477 U. S. 242, 252 (1986).
In creating the presumption at issue, these terms are combined in a very strange way. As our descriptions indicate, the first, “preponderance,” is customarily used to prescribe one possible burden or standard of proof before a trier of fact in the first instance, as when the proponent of a proposition loses unless he proves a contested proposition by a preponderance of the evidence. The term thus belongs in the same category with “clear and convincing” and “beyond a reasonable doubt,” which are also used to prescribe standards of proof (but when greater degrees of certainty are thought necessary). Before any such burden can be satisfied in the first instance, the factfinder must evaluate the raw evidence, finding it to be sufficiently reliable and sufficiently probative to demonstrate the truth of the asserted proposition with the requisite degree of certainty.
The second and third terms differ from the first in an important way. They are customarily used to describe, not a degree of certainty that some fact has been proven in the first instance, but a degree of certainty that a factfinder in the first instance made a mistake in concluding that a fact had been proven under the applicable standard of proof. They are, in other words, standards of review, and they are normally applied by reviewing courts to determinations of fact made at trial by courts that have made those determinations in an adjudicatory capacity (unlike the trustees here). See, e. g., Fed. Rule Civ. Proc. 52(a). As the terms readily indicate, a reviewing body characteristically examines prior findings in such a way as to give the original factfinder’s conclusions of fact some degree of deference. This makes sense because in many circumstances the costs of providing for duplicative proceedings are thought to outweigh the benefits (the second would render the first ultimately useless), and because, in the usual case, the factfinder is in a better position to make judgments about the reliability of some forms of evidence than a reviewing body acting solely on the basis of a written record of that evidence. Evaluation of the credibility of a live witness is the most obvious example.
Thus, review under the “clearly erroneous” standard is significantly deferential, requiring a “definite and firm conviction that a mistake has been committed.” And application of a reasonableness standard is even more deferential than that, requiring the reviewer to sustain a finding of fact unless it is so unlikely that no reasonable person would find it to be true, to whatever the required degree of proof.
The strangeness in the statutory language creating the first presumption arises from the combination of terms from the first category (burdens of proof) with those from the second (standards of review). It is true, of course, that this apparent confusion of categories may have resulted from the hybrid nature of the arbitrator’s proceeding in which it is supposed to be applied. The arbitrator here does not function simply as a reviewing body in the classic sense, for he is not only obliged to enquire into the soundness of the sponsor’s determinations when they are challenged, but may receive new evidence in the course of his review and adopt his own conclusions of fact. He may conduct proceedings in the same maimer and with the same powers as an arbitrator may-do under Title 9 of the United State Code, see 29 U. S. C. § 1401(b)(3), being authorized, for example, to hear (indeed to subpoena) witnesses and to take evidence. See 9 U. S. C. § 7; 29 U. S. C. § 1401(b)(3) (making specific reference to subpoena power). He is, then, a reviewing body (as is clear from his obligation, absent a contrary showing, to deem certain determinations by the plan sponsor correct), but a reviewing body invested with the further powers of a finder of fact (as is clear from his power to take evidence in the course of his review and from the presumption of correctness that a district court is bound to give his “findings of fact,” § 1401(c)). The arbitrator may thus provide a dual sort of trial and review, ultimately empowered to draw his own conclusions, and it would make sense to describe his different functions respectively by the language of trial and the language of review.
It does not, however, make sense to use the language of trial and the language of review as the statute does, for the statute does not refer to different arbitrator’s functions in language appropriate to each; it refers, rather, to one single conclusion that must be drawn about a determination previously made by a plan sponsor. By its terms the statute purports to provide a standard for reviewing the sponsor’s findings, and it defines the nature of the conclusion the arbitrator must draw by using a combination of terms that are categorically ill-matched. They are also inconsistent with each other on any reading. As used here, as distinct from its more usual context, the statutory phrase authorizing the arbitrator to reject a factual conclusion upon proof by a “preponderance” implies review of the sponsor’s determination on the basis of the record, supplemented by any new evidence, for simple error. If this statutory phrase were given effect, and the arbitrator concluded from a review of the record and of new evidence that a finding of fact was more probably wrong than not, it would be rejected, and a different finding might be substituted. On the other hand, requiring a showing that the sponsor’s determination was “clearly erroneous” or “unreasonable” would grant the plan sponsor’s factual findings a great deal of deference. But to say in this context that one must demonstrate that something is more probably clearly erroneous than not or more probably than not unreasonable is meaningless. One might as intelligibly say, in a trial court, that a criminal prosecutor is bound to prove each element probably true beyond a reasonable doubt. The statute is thus incoherent with respect to the degree of probability of error required of the employer to overcome a factual conclusion made by the plan sponsor.
The proper response to this incomprehensibility is obviously important in deciding this case. If it permitted an employer to rebut the plan sponsor’s factual conclusions by a preponderance, merely placing a burden of persuasion

Question: What treatment did the court whose decision the Supreme Court reviewed accorded the decision of the court it reviewed?
A. stay, petition, or motion granted
B. affirmed
C. reversed
D. reversed and remanded
E. vacated and remanded
F. affirmed and reversed (or vacated) in part
G. affirmed and reversed (or vacated) in part and remanded
H. vacated
I. petition denied or appeal dismissed
J. modify
K. remand
L. unusual disposition
Answer:

Answer: B