636
Opinion of the Court
precision inheres in the choice of actuarial methods and assumptions, the resulting difficulty is simply in the nature of the beast. Because it must fall on whichever party bears the burden of persuasion on such an issue, at least where the interests at stake are no more substantial than Concrete Pipe's are here, its allocation to one party or another does not raise an issue of due process. See supra, at 625-626.
IV
Concrete Pipe argues next that, as applied, the MPPAA violates substantive due process and takes Concrete Pipe's property without just compensation, both in violation of the Fifth Amendment. As to these issues, our decisions in Gray and Connolly provide the principal guidance.
A
In Gray we upheld the MPPAA against substantive due process challenge. Unlike the employer in Gray, Concrete Pipe here has no complaint that the MPPAA has been retroactively applied by predicating liability on a withdrawal decision made before passage of the statute. To be sure, since there would be no withdrawal liability without prewithdrawal contributions to the Plan, some of which were made before the statutory enactment, some of the conduct upon which Concrete Pipe's liability rests antedates the statute. But this fact presents a far weaker premise for claiming a substantive due process violation even than the Gray employer raised, and rejection of Concrete Pipe's contention is compelled by our decisions not only in Gray, but in Usery v. Turner Elkhorn Mining Co., 428 U. S. 1 (1976), upon which the Gray Court relied.
the presumption to reduce the likelihood of dispute and delay over technical actuarial matters with respect to which there are often several equally 'correct' approaches. Without such a presumption, a plan would be helpless to resist dilatory tactics by a withdrawing employer—tactics that could, and could be intended to, result in prohibitive collection costs to the plan." Committee Print 20-21.
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