Central States Areas v. Safeway, Inc ( 2000 )


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  • In the
    United States Court of Appeals
    For the Seventh Circuit
    Nos. 99-3724 & 99-3822
    Central States, Southeast and Southwest
    Areas Pension Fund, and Howard McDougall,
    trustee,
    Plaintiffs-Appellees, Cross-Appellants,
    v.
    Safeway, Inc.,
    Defendant-Appellant, Cross-Appellee.
    Appeals from the United States District Court
    for the Northern District of Illinois, Eastern Division.
    No. 98 C 2005--Harry D. Leinenweber, Judge.
    Argued March 30, 2000--Decided October 6, 2000
    Before Bauer, Diane P. Wood, and Williams, Circuit
    Judges.
    Diane P. Wood, Circuit Judge. The Central States,
    Southeast and Southwest Areas Pension Fund
    (Central States) is a well known multiemployer
    pension plan that serves members of the
    International Brotherhood of Teamsters who work
    in the midwestern United States. For years,
    Safeway operated many grocery stores in Central
    States’ coverage area. The employees in these
    stores were covered by collective bargaining
    agreements with the Teamsters. As part of those
    arrangements, Safeway was required to make
    contributions to the plan for more than 1500
    employees. In the late 1980s, Safeway sold the
    divisions that employed most of the plan members.
    By 1989, Safeway owned only one store that
    employed plan participants. This was its Eau
    Claire, Wisconsin, store, where 16 plan members
    worked. This case concerns the payments Safeway
    must make to Central States as a result of these
    changes in its business--changes known as
    "partial withdrawals" from the pension fund. The
    district court concluded that Safeway owed
    approximately $1.9 million for a 1993 partial
    withdrawal assessment. We affirm.
    I
    Employers who are part of multiemployer plans
    make contributions on the basis of the number of
    their employees covered by the plan (who are
    converted into the antiseptic-sounding
    "contribution base units"). So, if an employer’s
    workforce shrinks or the employer goes out of
    business, that employer reduces or ends its
    contributions to the plan. This could cause
    problems, because plan participants continue to
    enjoy their right to benefits upon retirement. If
    employers could simply stop contributing when
    they go out of business, downsize, or, as in this
    case, sell the divisions employing plan
    participants to somebody else, a plan could find
    itself substantially underfunded. To deal with
    this problem, Congress enacted the Multiemployer
    Pension Plan Amendments Act of 1980 (MPPAA), Pub.
    L. No. 96-364, 
    94 Stat. 1208
     (codified in
    scattered sections of 29 U.S.C.). The MPPAA
    creates "withdrawal liability" for employers that
    leave plans. Basically, when an employer pulls
    out, the plan in which it participated is
    permitted to approximate the degree to which it
    is underfunded (its "unfunded vested benefits,"
    or UVBs), and then charge the employer for its
    share of those UVBs. Moreover, under 29 U.S.C.
    sec. 1385, employers are subject to partial
    withdrawal liability when their contributions
    decline substantially over a period of several
    years. This is what happened to Safeway.
    Under the rules for determining when a partial
    withdrawal occurs, Safeway first incurred
    withdrawal liability in 1990 for its 1987 and
    1988 asset divestitures. Central States demanded
    $16.3 million from Safeway; eventually, they
    settled on $12.6 million. This settlement was
    confirmed in November 1993. In 1995, Central
    States came calling again, this time claiming
    that Safeway incurred partial withdrawal
    liability for 1993. The gross assessment was
    $11,299,544, but Safeway received a credit for
    its 1990 payment, making the net demand
    $1,985,363. Despite the hefty reduction that took
    into account the earlier payment, Safeway argued
    that it was entitled to an even greater credit.
    Central States disagreed, relying on the credit
    rules that are contained in the regulations
    issued by the body responsible for overseeing
    Employee Retirement Income Security Act (ERISA)
    plans, the Pension Benefit Guarantee Corporation
    (PBGC). Safeway responded that those regulations
    are unreasonable since their use resulted in a
    nearly two million dollar assessment even though
    no additional assets were sold. Its 1993
    liability rested instead only on the statutory
    definition of a "partial withdrawal."
    Anticipating that plans and employers will
    occasionally have disputes over the applicability
    of the rules, the MPPAA creates a "pay first,
    fight later" regime under which a dispute over
    withdrawal liability is referred to arbitration,
    but only after the employer turns the disputed
    amount over to the plan. See 29 U.S.C. sec.
    1401(d). This is the path Safeway followed. It
    initiated an arbitration proceeding to contest
    the fund’s calculation of its 1993 withdrawal
    liability and the credit method the fund used. In
    an interim decision, the arbitrator first decided
    that the settlement agreement with respect to the
    1990 withdrawal assessment (which led to the
    $12.6 million figure mentioned above) did not
    operate as a bar of the 1993 partial withdrawal
    demand. Second, the interim decision held that
    the fund was not estopped from applying its
    credit method because it had not specifically
    notified Safeway that it was going to change its
    practice. The change arose from a final credit
    regulation published in the Federal Register, 
    57 Fed. Reg. 59,808
     (Dec. 16, 1992), which was
    notice to the world that the fund would be
    required to change its method. Last, the
    arbitrator decided that the fund’s calculation of
    Safeway’s 1993 withdrawal liability was flawed.
    The fund used what is called the "modified
    presumptive method" of calculating withdrawal
    liability established in ERISA sec. 4211(c)(2).
    But it applied a 10-year allocation period, found
    in a separate subsection of ERISA, sec.
    4211(c)(5)(C). The arbitrator found that the fund
    could not put these together and thus could not
    use a 10-year allocation period consistently with
    ERISA sec. 4206 and the applicable credit
    regulations. Instead, it had to use the five-year
    period found in credit regulation 29 C.F.R. sec.
    2649.4. In accordance with the arbitrator’s
    ruling, Central States recalculated Safeway’s
    withdrawal liability using the five-year
    allocation period, but that led it to revise its
    1993 demand upward, to approximately $2.2
    million. In his final decision, the arbitrator
    essentially threw up his hands in dismay. He
    expressed the opinion that he was "convinced that
    the Fund is due additional payment because of the
    1993 partial withdrawal and that the Employer is
    entitled to a reasonable credit for the payment
    that it made because of the prior withdrawal."
    But he ultimately concluded that the regulations
    were so irrational that they did not provide
    direction to the fund to calculate a proper
    credit and thus that its demand for payment had
    to be set aside.
    Central States then appealed to the district
    court, as permitted by 29 U.S.C. sec. 1401(b).
    Safeway argued, as it had before, that the
    agreement that settled the 1990 dispute precluded
    Central States’ request, that Central States was
    estopped from demanding money for the 1993
    withdrawal by virtue of statements made by one of
    its representatives, and that the regulations
    providing for subsequent withdrawal liability
    were so incoherent as to be irrational and
    unenforceable. It also urged that the regulation
    was unconstitutional as applied to it, either as
    a taking or as a violation of substantive due
    process. The district court, properly reviewing
    the arbitrator’s legal conclusions de novo, see,
    e.g., Joseph Schlitz Brewing Co. v. Milwaukee
    Brewery Workers’ Pension Plan, 
    3 F.3d 994
    , 999
    (7th Cir. 1994), affirmed on other grounds, 
    513 U.S. 414
     (1995), disagreed with all of Safeway’s
    arguments and vacated the arbitration award. It
    also concluded that the arbitrator had erred in
    finding that Central States could not use a 10-
    year allocation period for its 1993 demand.
    Consequently, the court held that Safeway was
    liable for the $1,985,363 originally demanded by
    Central States and that, since Safeway had paid
    up, Central States could simply keep the money
    and the case was closed. Safeway now appeals;
    Central States, having seen what the five-year
    period would do for it, has cross-appealed to
    argue that this is the one that should apply.
    II
    Before we can consider the district court’s
    reasoning, we must address a jurisdictional
    argument that Central States has presented. It
    claims that the district court lacked
    jurisdiction over Safeway’s request to enforce
    the arbitrator’s award because it came too late.
    Under 29 U.S.C. sec. 1401(b)(2), a party has 30
    days to bring an action in district court to
    "enforce, vacate, or modify" an MPPAA arbitration
    award. The arbitrator’s final decision was dated
    March 21, 1998; Central States filed its action
    to vacate the award on April 1, 1998, but Safeway
    did not file its counterclaim until May 29, 1998,
    well more than 30 days beyond the arbitrator’s
    decision. Central States seems to think that this
    leaves the arbitrator’s award in some state of
    limbo, under which it is not enforceable, because
    no timely petition for enforcement was filed. It
    follows, according to Central States, that it can
    keep the money. This, we think, is a real stretch
    at best, and at worst a serious misunderstanding
    of the position in which the party who is content
    with an arbitral award finds itself. But there
    are other reasons as well for rejecting Central
    States’ argument.
    Central States’ position is premised on two
    points: first, that the 30-day period provided by
    sec. 1401(b)(2) applies here, not the six-year
    limitations period for ERISA actions contained in
    29 U.S.C. sec. 1451(f) (or the three-year period
    that applies when the plaintiff knows or should
    know of the cause of action), and second, that
    the 30 days given by sec. 1401(b)(2) are
    jurisdictional in the strong sense of the term--
    that is, nonwaivable and not subject to doctrines
    like estoppel. The district court, relying on the
    reasoning of the Third Circuit in Trustees of
    Amalgamated Ins. Fund v. Sheldon Hall Clothing,
    Inc., 
    862 F.2d 1020
     (3d Cir. 1988), found that
    sec. 1451(f) was the more apt statute and thus
    that its six-year period applied. Sheldon Hall
    Clothing found that although the 30-day limit
    should apply when a party wants to vacate or
    modify an award, it was not reasonable to impose
    a 30-day limit on an action to enforce the award.
    Consequently, it concluded that the more general
    six-year period applies to an action solely to
    enforce an arbitral award.
    We are doubtful about this. The language of
    sec. 1401(b)(2) says that it applies to actions
    to "enforce, vacate, or modify"; the statute
    draws no distinction among these types of
    actions. Nor, as the parties’ extensive
    argumentation in this case illustrates, is it
    easy to distinguish one type of action from
    another. Safeway claims that it merely wants the
    award enforced, while Central States says that
    Safeway really wants a modification. The Third
    Circuit in Sheldon Hall Clothing was concerned
    that the limitations period provided in sec.
    1401(b)(2) might be too short, since a party may
    need more than 30 days to determine if the loser
    in arbitration is willing to comply with the
    terms of the award. Moreover, the Third Circuit
    thought that it made little sense to allow a
    party to escape an arbitration award merely by
    waiting 30 days and then ignoring the award with
    impunity. But this assumes that a party wishing
    to enforce an arbitration award under sec.
    1401(b)(2) must wait until the losing party has
    violated the award in order to bring its action
    in the district court. This is not the way sec.
    1401(b)(2) reads. Instead, it says that "any
    party [to the arbitration] may bring an action to
    enforce." The reference to "any party" (rather
    than, say, "any party aggrieved") undercuts the
    notion that only the loser in arbitration can
    bring an action. Nor does such a rule comport
    with practice. See, e.g., Central States,
    Southeast and Southwest Areas Pension Fund v.
    Paramount Liquor Co., 
    203 F.3d 442
    , 445 (7th Cir.
    2000) (holding that suits brought by victorious
    employer and losing plan in separate venues were
    equally appropriate). Victorious in arbitration,
    Safeway could have then gone to court to reduce
    its arbitration award to a judgment pursuant to
    sec. 1401(b)(2).
    We need not decide, however, if there are ever
    circumstances under which the longer statute
    might apply. There can be no doubt that an action
    is proper within 30 days, and if there are ways
    of extending that period, the action would also
    satisfy the 30-day rule. The question thus is
    whether the 30-day period has any flexibility, or
    if it is rigidly jurisdictional such that the
    district court has no power over the case if the
    appeal is filed too late. We stated in Central
    States, Southeast and Southwest Areas Pension
    Fund v. Navco, 
    3 F.3d 167
    , 173 (7th Cir. 1993),
    that "periods of limitation in federal statutes
    . . . are universally regarded as
    nonjurisdictional." This refers, however, to time
    periods that are properly characterized as a
    statute of limitations, and not a limitation on
    judicial power. Examples of the latter include 28
    U.S.C. sec. 2101 (specifying the time in which an
    appeal or a writ of certiorari must be filed with
    the Supreme Court) and Fed. R. App. P. 4
    (specifying the time for filing a notice of
    appeal in the court of appeals). In those cases,
    the passage of too much time deprives the court
    of jurisdiction, regardless of what the parties
    may wish. On the other hand, a true statute of
    limitations may be waived by the parties’
    agreement or conduct.
    The question is thus what kind of rule is
    established by sec. 1401: a limitations period,
    or a limit on judicial power? The fact that
    occasional opinions can be found calling sec.
    1401 a "jurisdictional" statute is not
    dispositive, because some "jurisdictional" rules
    (such as those governing personal jurisdiction)
    really describe personal rights that can be
    waived, see Insurance Corp. of Ireland, Ltd. v.
    Compagnie des Bauxites de Guinee, 
    456 U.S. 694
    ,
    702 (1982), and others do not. Thus, we do not
    agree with Central States that the Third
    Circuit’s passing reference to sec. 1401 as
    "jurisdictional" in Crown Cork and Seal, Inc. v.
    Central States, Southeast and Southwest Areas
    Pension Fund, 
    982 F.2d 857
    , 860 (3d Cir. 1992),
    resolves the matter. A closer look at Crown Cork
    and Seal shows that the court was describing the
    source of the federal question, not the question
    of the proper way to regard the 30-day time
    period. Our decision in Navco, holding that the
    general ERISA limitations period in sec. 1451(f)
    is not jurisdictional, is more directly on point.
    See Navco, 
    3 F.3d at 173
    . In addition, we note
    that the Supreme Court normally treats a
    statutory time period within which litigation
    must be commenced as non-jurisdictional. See,
    e.g., Irwin v. Department of Veterans Affairs,
    
    498 U.S. 89
    , 95-96 (1990); Zipes v. Trans World
    Airlines, Inc., 
    455 U.S. 385
    , 393 (1982). We
    conclude that sec. 1401 should be treated the
    same way as sec. 1451(f), and thus that its 30-
    day period is better conceived of as a
    limitations period subject to the normal rules of
    waiver and estoppel.
    Estoppel (or waiver) is Safeway’s alternative
    argument to preserve its appeal, and we find it
    persuasive on these facts. In conjunction with
    its petition to the district court, Central
    States sent Safeway a letter to confirm that
    Safeway’s local counsel would receive service of
    process. In that letter, Central States "agree[d]
    that Safeway has thirty days from today’s date to
    answer or otherwise plead in response to this
    complaint." The letter was dated April 29,
    exactly 30 days before Safeway filed its
    counterclaim. We agree with Safeway that through
    this letter Central States waived any limitations
    objection it might otherwise have had. Both parts
    of this case (i.e. Safeway’s effort to enforce
    the award, and Central States’ challenge to it)
    are thus properly before us, and we can now turn
    to the merits.
    III
    A.
    The statutory and regulatory apparatus under
    which Central States was operating are not models
    of clarity--at least not to those who are
    uncomfortable operating in a world dominated by
    numbers and mathematical formulas. Nonetheless,
    neither Central States’ actions nor Safeway’s
    challenges will be comprehensible unless we take
    a moment to review the governing laws and
    regulations.
    Safeway’s asset sale resulted in a "partial
    withdrawal" for MPPAA purposes by virtue of 29
    U.S.C. sec. 1385(a)(1), which imposes partial
    withdrawal liability for any plan year during
    which there is a "70 percent contribution
    decline." The first question is thus how a 70%
    contribution decline is calculated. Congress
    could have chosen to define this in a simple way-
    -if an employer’s contribution is less than 30%
    of the prior year’s level, then it incurs
    liability. This, however, would have caused
    problems for employers with relatively volatile
    year-to-year contributions but a consistent
    contribution pattern over time. In order to
    address that concern, Congress chose instead to
    create an eight-year rolling window divided into
    two parts: a three-year "testing" period that
    consists of the three most recent plan years and
    a five-year period (usually called the "lookback
    period"), which is comprised of the five plan
    years prior to the beginning of the testing
    period. See 29 U.S.C. sec. 1385(b)(1)(B). A
    partial withdrawal occurs when an employer’s
    contribution level for every year during the
    testing period is lower than 30% of the average
    of the two highest contribution years during the
    lookback period. See 29 U.S.C. sec.
    1385(b)(1)(A).
    Although this method reduces problems related to
    business volatility, it introduces another
    problem. Because partial withdrawal liability is
    determined annually and independently of any
    prior partial withdrawals, an employer that
    permanently reduces its contribution levels as a
    result of an asset sale or other business change
    will probably incur withdrawal liability several
    times. The reason is that as years pass, the
    lookback period will continue to reach the pre-
    asset sale, high contribution years. This makes
    it likely that the testing period contribution
    levels (i.e. amounts paid in each of the most
    recent three years) will be less than 30% of the
    average of the two highest lookback years (i.e.
    the period from eight years ago through four
    years ago). That is what happened to Safeway. It
    sold its assets primarily in 1987 and 1988. Under
    these formulas, this meant that it first incurred
    withdrawal liability in 1990 (because the formula
    for partial withdrawal requires that the
    contribution level for every testing period year
    must be 70% less than the average of the two
    highest lookback years, so a few years have to
    pass before the employer becomes liable). At the
    end of 1993, the testing period was calendar
    years 1991, 1992, and 1993; the lookback period
    stretched all the way to 1986. Because Safeway
    had high contribution levels in 1986 and 1987
    (i.e. before it sold its midwestern stores), it
    incurred partial withdrawal liability for 1993.
    (It also incurred such liability for 1991 and
    1992, but it received a credit for its 1990
    payment that covered the entire balance.)
    In order to deal with the possibility that a
    withdrawing employer could be overburdened by
    application of the MPPAA partial withdrawal
    formula, Congress also provided a credit
    mechanism for partial withdrawal liability.
    Initially, this was a simple dollar-for-dollar
    credit for any amount previously paid to the
    plan. See 29 U.S.C. sec. 1386(b)(1). In Safeway’s
    case, that would mean that it would receive a
    full credit against its 1993 liability for the
    $12.6 million that it paid Central States in
    conjunction with its 1990 withdrawal (here, of
    course, leaving no net payment due, because the
    1993 charge was about $11.3 million). The dollar-
    for-dollar system, however, risked being too
    generous: liability for some additional UVBs
    would continue to accrue, even while some
    existing liabilities were satisfied. In other
    words, even if the total amount of UVBs remains
    the same, the composition of the liabilities will
    be different. Giving withdrawing employers a full
    credit for prior payments places all of the
    burden of new UVBs on remaining employers, which
    was precisely what the MPPAA was designed to
    prevent.
    This wrinkle led Congress to authorize PBGC to
    issue regulations that "provide for proper
    adjustments in [the credit] . . . so that the
    liability for any complete or partial withdrawal
    in any subsequent year . . . properly reflects
    the employer’s share of liability with respect to
    the plan." See 29 U.S.C. sec. 1386(b)(2). PBGC
    did so, with temporary regulations in 1987, which
    it finalized in 1992. Under these regulations,
    the credit phases out over time, thereby roughly
    capturing the change in the composition of the
    liability pool and allocating withdrawal
    liability accordingly. See generally 29 C.F.R.
    sec. 4206.1 et seq.
    This, in general terms, is the system Central
    States was applying when it determined that
    Safeway was liable for a partial withdrawal in
    1993. Safeway’s opening argument is really a
    broadside attack on Congress’s entire reasoning.
    Safeway points out that if it had withdrawn
    completely from Central States in 1988, it would
    have incurred only its liability for that year
    and an additional $135,000 in future liability.
    How, it asks, can it be rational for the statute
    and the PBGC regulations to impose nearly $2
    million more in liability in 1993? This in its
    view cannot possibly "properly reflect" its share
    of liability to Central States for the UVBs, as
    required by sec. 1386(b)(2). It concludes that
    only the original dollar-for-dollar formula can
    be valid.
    Given that Congress has entrusted PBGC with the
    responsibility of filling out the MPPAA’s
    regulatory scheme, we review its work
    deferentially and will uphold its regulations if
    they are based on a permissible construction of
    the MPPAA. See, e.g., Production Workers’ Union
    of Chicago and Vicinity v. NLRB, 
    161 F.3d 1047
    ,
    1050-51 (7th Cir. 1998). We consider those
    regulations here in the context of Safeway’s
    challenge to their application.
    Applying the rules for partial withdrawals,
    Central States concluded that Safeway was still
    liable for a partial withdrawal in 1993. It then
    applied a statutory formula to calculate the
    amount of the liability. Central States uses the
    "modified presumptive method" that is permitted
    under 29 U.S.C. sec. 1391(c)(2). Under this
    provision, a plan’s UVBs are divided into two
    groups, which the parties call Pool 1 and Pool 2.
    Pool 1 liabilities are liabilities that were
    incurred before 1980 (when the MPPAA went into
    effect); Pool 2 consists of post-1980
    liabilities. A particular employer’s share of
    Pool 1 and Pool 2 liabilities is calculated
    separately; the sum of these two is the total
    withdrawal liability. The statutory verbiage is
    complicated, but in essence this is what happens:
    the employer’s share is determined by multiplying
    each pool by the portion of all contributions to
    the plan made by the withdrawing employer for the
    last ten years of the pool in question (sec.
    1391(c)(2) provides for five years, but Central
    States exercised its option under 29 U.S.C. sec.
    1391(c)(5)(C) to lengthen this to ten years). In
    other words, Congress opted to allocate UVBs
    according to the relative size of an employer’s
    contribution. PBGC followed this lead in the
    credit regulations, which also use a similar
    proportional method for determining the amount of
    an employer’s credit. 29 C.F.R. sec. 4206.5.
    The interaction of the various MPPAA formulas
    that are used to determine when a withdrawal
    occurs, the employer’s share of liability in the
    event of a withdrawal, and the credit that an
    employer is to receive all contain some factors
    that in this instance worked to Safeway’s
    disadvantage. For example, the amount of credit
    that Safeway receives for Pool 2 liabilities is
    reduced on a straight-line basis over, in this
    case, a ten-year period even though there is no
    similar reduction when liability is calculated in
    the first place. Compare 29 C.F.R. sec.
    4206.5(b)(2) (reducing the credit) with 29 U.S.C.
    sec. 1391(c)(2)(C) (calculating the employer’s
    share of Pool 2 liabilities). Along similar
    lines, 29 C.F.R. sec. 4206.5(b) (which provides
    the applicable methodology for calculating
    Safeway’s credit, subject to the modification
    allowed by sec. 4206.9 for Central States’ use of
    a ten-year period in calculating its allocation
    fractions) determines the amount of the credit on
    the basis of "the end of the plan year preceding
    the withdrawal for which the credit is being
    calculated." It appears that Central States
    interpreted the "withdrawal for which the credit
    was being calculated" as the 1993 withdrawal,
    meaning that it used that year’s liability
    values. This is not the only possible reading of
    this regulation; perhaps the withdrawal to which
    the regulation refers is the 1990 withdrawal, in
    which case Safeway would receive a larger credit.
    On appeal, Safeway does not mention either of
    these issues, so naturally any arguments relating
    to them are waived. International Union of
    Operating Engineers v. Rabine, 
    161 F.3d 427
    , 432
    (7th Cir. 1998); Ricci v. Village of Arlington
    Heights, 
    116 F.3d 288
    , 292 (7th Cir. 1997).
    Instead, it focuses its energy on a single factor
    in its withdrawal liability calculation: the
    changing mixture of Pool 1 and Pool 2 liabilities
    in Central States’ overall unfunded benefit
    levels from 1990 until 1993.
    Safeway’s major problem comes from the statutory
    method for determining the amount of Pool 1 and
    Pool 2 liabilities. At the end of any particular
    plan year, Central States’ actuaries determine
    the total amount of UVBs by estimating the
    aggregate level of vested benefits and then
    comparing this to the plan’s assets. Congress
    prescribed the formula for dividing these UVBs
    into Pool 1 and Pool 2. First, a plan amortizes
    its Pool 1 liabilities on a straight-line basis
    over 15 years, meaning that it takes the 1980
    level, then reduces it by 1/15 for each year that
    has passed since 1980. (Note that this also means
    that the problem we face here is a disappearing
    one.) This reduction accounts for the commonsense
    intuition that the further one gets from 1980,
    the smaller the portion of total UVBs that are
    properly allocable to this period. Pool 2 is then
    defined as the residual amount of UVBs (i.e.
    total UVBs less Pool 1). As a consequence of this
    formula, a plan’s total UVB level can remain
    constant while the mix between Pool 1 and Pool 2
    changes (as Pool 1 gets amortized away).
    In Safeway’s case, this change in the mix of
    liabilities happened very quickly. Precisely how
    quickly is unclear from the record. Central
    States’ assessment forms indicate that in 1990,
    Pool 1 comprised roughly 95.5% of total UVBs,
    whereas in 1993, Pool 1 had dropped to about 70%
    of the total. Safeway paints a much more dramatic
    picture, arguing that by 1993, Pool 1 represented
    only a trivial portion of total UVBs. The reasons
    for this apparent disagreement are not clear, but
    what matters in this case is the direction, not
    the magnitude, of the change. The reason that the
    change matters is because, as discussed above,
    liabilities and credits are calculated separately
    for each pool, then added together to determine
    an employer’s net position. This means that in
    1990 Safeway paid a lot of money based mostly on
    Pool 1 liabilities. Then, in 1993, Central States
    was entitled to take a fresh look at Safeway’s
    withdrawal. The company’s new liability and
    credit were then based on the new Pool 1 and Pool
    2 levels. But since Pool 1 has shrunk, so has
    Safeway’s credit. Meanwhile, its liability for
    Pool 2 increased. So Safeway owes again.
    As we have already noted, Safeway’s argument
    that it was entitled to a full credit for its
    1990 payments rests on the assumption that it
    does not make any sense for it to incur
    withdrawal liability multiple times when it
    downsized only once. It believes that its
    predicament is just an unintended (and
    irrational) consequence of the rote application
    of the MPPAA’s formula for determining when a
    partial withdrawal occurs. To the extent Safeway
    argues that multiple instances of partial
    withdrawal liability are patently irrational and
    that the PBGC regulations are invalid if they
    fail to correct the problem, we disagree. Far
    from being a freak occurrence, multiple instances
    of withdrawal liability are virtually guaranteed
    by application of the sec. 1385 formula, and the
    formula itself was rationally designed to address
    a number of problems with multiple employer
    plans. Congress was aware that sequential
    payments would be required, as the numerical
    example that appears in the MPPAA’s legislative
    history shows. See H.R. Rep. No. 96-869, pt. 2,
    at 51 (1980). Consequently, we reject any notion
    that the PBGC credit regulations must fully
    correct for multiple instances of partial
    withdrawal liability that arise out of the same
    business event. Rather, our focus is on the
    particulars of Safeway’s problem and the credit
    method’s treatment of its case.
    Safeway decries the change in the mix of
    Central States’ UVBs, calling it a "spillover" of
    liabilities from Pool 1 into Pool 2. Safeway
    maintains that these are really the same UVBs,
    that nothing meaningful happened between 1990 and
    1993, and that the conversion from Pool 1 to Pool
    2 is just an accounting fiction for which it
    should not have to pay. But something important
    did happen: time passed. And as time passed, the
    mix of Central States’ UVB pool changed
    substantially. In 1990, most of the UVBs were
    "old" (pre-1980), whereas in 1993 many more of
    them were "new" (post-1980). It is true that this
    is primarily a product of the accounting method
    that Congress chose to age the benefits, but the
    same could be said of any attribution of benefits
    to a particular plan year or set of years. (We
    also see nothing that would systematically harm
    all employers; the movement from one pool to
    another will cause some to gain and others to
    lose, depending on the composition and stability
    of the workforce.)
    Some method is necessary to handle the aging of
    benefits; otherwise, there will be no match
    between the time during which an employer
    participated in a plan and the liabilities for
    which it is responsible. Congress chose a very
    simple method, placing a plan’s liabilities into
    one of two categories: old (i.e. Pool 1) and new
    (i.e. Pool 2). Furthermore, it picked a simple
    method for determining the portion of total UVBs
    properly included in each of the pools: 15-year
    straight-line amortization. Over time, the
    proportion attributable to each pool will
    inevitably change, as it did here. It would be
    easy to scoff at this as accounting fiction since
    the coarseness of the actuarial method is so
    apparent. And certainly Congress could have come
    up with (or could have had PBGC come up with)
    more sophisticated methods that would more
    perfectly match a plan’s UVBs with a particular
    plan year. But it is only accounting fiction
    because Safeway is unhappy with the result.
    Everywhere else, it is just accounting.
    Safeway’s position, then, boils down to a claim
    that the regulations are unreasonable for failing
    to correct the actuarial imperfections in the
    system for aging benefits that Congress
    authorized plans such as Central States to use.
    We see nothing in sec. 1386(b)(2) that places
    such a heavy burden on PBGC. As our discussion of
    the methods underlying the calculation of MPPAA
    withdrawal liability shows, there are a variety
    of assumptions and tradeoffs implicit in this
    system. One of these is a simplified method for
    aging a plan’s UVBs. Section 1386(b)(2) requires
    the regulations to adjust an employer’s credit so
    that it "properly reflects" the employer’s
    liability, but this mandate must be read in light
    of the other provisions of the MPPAA, including
    sec. 1391(c)(2)’s approach to aging benefits. The
    PBGC regulations appear to do a fairly good (or
    at least not unreasonable) job of following
    Congress’s simple actuarial method, insofar as
    the same division (between old and new UVBs) is
    used to determine both liability and credit.
    There is no irrationality in PBGC’s decision to
    apply the same rules on both the liability and
    credit sides of the fence. While a more
    complicated method might help Safeway, Congress
    was not compelled to choose one. Because PBGC was
    not under an obligation to make an imperfect
    system perfect, it was by the same token not
    under an obligation in Safeway’s case to reverse
    what Safeway calls the spillover from Pool 1 into
    Pool 2.
    B.
    Next, Safeway argues that the district court
    reached an entirely wrong conclusion because it
    applied the wrong regulation in the first place.
    Central States now agrees, though the two sides
    see radically different results stemming from
    this argument. The fund argues that the
    applicable regulation is 29 C.F.R. sec. 4206.5.
    This section provides the credit method for plans
    that use the modified presumptive method for
    determining liability. The modified presumptive
    method normally looks back five years in
    determining an employer’s partial withdrawal
    liability. See 29 U.S.C. sec. 1391(c)(2)(B) and
    (C). As we have noted, Central States took
    advantage of a provision that allowed it to
    extend this five-year window to ten years. 29
    U.S.C. sec. 1391(c)(5). This difference led the
    district court to choose 29 C.F.R. sec. 4206.9,
    which covers plans that have "adopted an
    alternative method of allocating unfunded vested
    benefits pursuant to [29 U.S.C. sec.
    1391(c)(5)]." Under the regulation, plans must
    adopt credit methods "consistent with the rules
    in [29 C.F.R.] sec.sec. 4206.4 through 4206.8 for
    plans using the statutory allocation method most
    similar to the plan’s alternative allocation
    method." If this section applies, the upshot is
    that Central States should use the method that
    appears in sec. 4206.5, but with a modification
    for its use of the ten-year period. The
    difference between using the five- and ten-year
    windows isn’t trivial. If Central States is
    allowed to use the five-year period, it is
    entitled to another $225,000. Safeway teams up
    with Central States in attacking the district
    court’s acceptance of 29 C.F.R. sec. 4206.9, but,
    unsurprisingly, draws a very different conclusion
    from its inapplicability. Safeway maintains that
    none of the regulatory methods prescribed by PBGC
    is applicable, thereby creating a sort of
    "regulatory limbo." Absent a governing
    regulation, Safeway maintains that we must go
    back to the statutory standby, which was the
    dollar-for-dollar credit of 29 U.S.C. sec.
    1386(b)(1). Since Safeway paid $12.6 million in
    connection with its 1990 partial withdrawal and
    Central States’ assessment for 1993 was only
    $11.3 million, it would owe nothing under this
    rule.
    The district court concluded that the
    "alternative method" regulation applied (and thus
    that Central States was obliged to stick with the
    ten-year period it had formally chosen) because
    it refers to the "alternative method of
    allocating unfunded vested benefits pursuant to
    [29 U.S.C. sec. 1391(c)(5)]." 29 C.F.R. sec.
    4206.9. The statutory provision that allows
    Central States to use a ten- rather than five-
    year window is 29 U.S.C. sec. 1391(c)(5)(C)
    (allowing plans to use any period between five
    and ten years for computing the various statutory
    fractions), meaning that the regulation applies
    on its face. Notwithstanding the fact that the
    regulation refers to all of sec. 1391(c)(5),
    Safeway and Central States both argue that PBGC
    really meant to refer only to subsections (A) and
    (B), not (C). Their main support for this
    contention is that the words "alternative
    methods" appear in (A) and (B) but not (C).
    The arbitrator accepted this argument, but, like
    the district court, we are not convinced. First,
    neither sec. 1391(c) (5)(A) or (B) actually
    prescribes an alternative method. Rather, (A)
    simply gives PBGC the authority to approve
    alternative methods for determining liability
    that the plans themselves create. Likewise, (B)
    authorizes PBGC to issue standardized approaches
    to permit plans to create their own methods of
    assessing liability without the need for specific
    PBGC approval. Neither actually creates an
    alternative method. Both relate instead to
    precisely the same issue that subsection (C)
    covers, which is the authority of plans to modify
    their method of determining liability. No one has
    suggested a good reason not to take sec. 4206.9
    at face value.
    Second, and more importantly, the reading the
    district court chose avoids the strange results
    that would flow from either Safeway’s or Central
    States’ position. Safeway’s argument (that no
    section applies and that, consequently, the
    dollar-for-dollar approach governs) creates an
    enormous loophole in an otherwise comprehensive
    regulation that PBGC spent more than five years
    developing. Central States’ (post-litigation)
    position (that sec. 4206.5’s five-year credit
    amortization applies) makes equally little sense.
    If a plan is using a ten-year window to determine
    liability (which Central States is not willing to
    give up), it should also use a ten-year period to
    determine an employer’s credit. That is the
    overall point of sec. 4206.9, which directs plans
    that do not follow one of the statutory methods
    for computing withdrawal liability to adapt their
    credit mechanisms accordingly. That was also
    Central States’ pre-litigation understanding of
    the regulation, as evidenced by its adoption of
    a credit rule that uses a ten-year amortization
    period. Given all of that, we conclude that sec.
    4206.9 applies, and Central States’ original
    assessment used the correct regulation.
    C.
    Failing all other possible avenues of attack,
    Safeway turns to the Constitution. It argues that
    the effect of the partial withdrawal liability
    credit regulations is so unfairly skewed against
    it as to amount to an unconstitutional taking.
    Pointing to Connolly v. Pension Benefit Guarantee
    Corp., 
    475 U.S. 211
     (1986), which upheld the
    MPPAA against a takings challenge rooted in the
    employer’s contract with the plan, Safeway relies
    on a concurrence in which two members of the
    Court suggested that "the imposition of
    withdrawal liability under the MPPAA . . . may in
    some circumstances be so arbitrary and irrational
    as to violate the Due Process Clause of the Fifth
    Amendment." 
    475 U.S. at 228
     (O’Connor, J.,
    concurring). This is just the case Justice
    O’Connor had in mind, Safeway tells us. But it is
    important to note what Safeway has not argued. It
    has not challenged the constitutionality of the
    actuarial method used to age unfunded benefits in
    the first place. Rather, its argument is that the
    PBGC regulations are unconstitutional for failing
    to correct adequately for what it perceives as
    distortions in the calculation of partial
    withdrawal liability. By itself, this is an
    uphill battle. The real death knell for Safeway’s
    position, however, is sounded by the statutory
    requirement that any PBGC method used to
    determine an employer’s credit "properly reflect
    the employer’s share of liability with respect to
    the plan." 29 U.S.C. sec. 1386(b)(2). The
    Connolly concurrence suggests the possibility of
    lurking Due Process and Takings concerns where
    MPPAA withdrawal provisions "may lead to
    extremely harsh results" that are "not easily
    traceable to the employer’s conduct." 
    475 U.S. at 235
     (O’Connor, J., concurring). Since sec.
    1386(b)(2) cabins PBGC’s discretion and instructs
    it to create regulations that "properly reflect"
    an employer’s share, a set of regulations that
    passes the statutory test will, therefore, also
    pass constitutional muster. For the reasons we
    have already described, we conclude that the set
    of possibilities allowed by sec. 1386(b)(2) and
    reflected in the regulations is a subset of all
    constitutionally permissible regulations. Our
    conclusion that the regulation is within PBGC’s
    statutory authority therefore also resolves the
    constitutional question against Safeway.
    D.
    Safeway makes two final arguments. First,
    Safeway argues that a provision of the agreement
    settling the 1990 demand precludes Central
    States’ current claim. Second, it claims that
    Central States is estopped from making a change
    away from the dollar-for-dollar system, because
    of some oral representations an employee made in
    June 1992. For the reasons stated by the district
    court, we find these points and any others
    Safeway has presented here that we have not
    specifically discussed to be without merit.
    IV
    It is easy to understand why Safeway regards
    itself as a victim of circumstances. The timing
    of its midwestern asset sales, along with the
    many approximations and balances that are part of
    the MPPAA’s attempt to regulate the enormously
    complex area of multiemployer pensions (the
    manner in which the MPPAA "ages" an employer’s
    liabilities, the possibility of successive
    partial withdrawals as a result of the three-year
    testing and five-year lookback periods, and
    Congress’s decision to allow plans to use ten
    years of contribution history to determine an
    employer’s allocable share), all combined to
    produce an expensive result. But we cannot say
    that it was a fundamentally unfair result, nor a
    result outside the boundaries of the statutes and
    regulations. We therefore Affirm the judgment of
    the district court.