Cite as: 508 U. S. 602 (1993)
Opinion of the Court
" 'It is by now well established that legislative Acts adjusting the burdens and benefits of economic life come to the Court with a presumption of constitutionality, and that the burden is on one complaining of a due process violation to establish that the legislature has acted in an arbitrary and irrational way. See, e. g., Ferguson v. Skrupa, 372 U. S. 726 (1963); Williamson v. Lee Optical Co., 348 U. S. 483, 487-488 (1955).
. . . . . " '[I]t may be that the liability imposed by the Act . . . was not anticipated at the time of actual employment. But our cases are clear that legislation readjusting rights and burdens is not unlawful solely because it upsets otherwise settled expectations. See Fleming v. Rhodes, 331 U. S. 100 (1947); Carpenter v. Wabash R. Co., 309 U. S. 23 (1940); Norman v. Baltimore & Ohio R. Co., 294 U. S. 240 (1935); Home Bldg. & Loan Assn. v. Blaisdell, 290 U. S. 398 (1934); Louisville & Nashville R. Co. v. Mottley, 219 U. S. 467 (1911). This is true even though the effect of the legislation is to impose a new duty or liability based on past acts. See Lichter v. United States, 334 U. S. 742 (1948); Welch v. Henry, 305 U. S. 134 (1938); Funkhouser v. Preston Co., 290 U. S. 163 (1933).' " Gray, 467 U. S., at 729-730, quoting Turner Elkhorn, supra, at 15-16 (footnotes omitted).
To avoid this reasoning, Concrete Pipe relies not merely on a claim of retroactivity, but on one of irrationality. Since the company contributed to the plan for only 31/2 years, it argues, none of its employees had earned vested benefits through employment by Concrete Pipe at the time of its withdrawal. See Brief for Petitioner 28. Concrete Pipe argues that, consequently, no rational relationship exists between its payment of past contributions and the imposition of liability for a share of the unfunded vested benefits.
But this argument simply ignores the nature of multi-employer plans, which, as we have said above, operate by
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