Cite as: 508 U. S. 602 (1993)
Opinion of the Court
under the substantive Due Process Clause is appropriate here: although Concrete Pipe is not itself a member of any of the management associations that are represented among the trustees of the fund, Concrete Pipe voluntarily chose to participate in the Plan, notwithstanding this fact. See supra, at 641, and n. 26.
As to the second factor bearing on the taking determination, the severity of the economic impact of the Plan, Concrete Pipe has not shown its withdrawal liability here to be "out of proportion to its experience with the plan," 475 U. S., at 226, notwithstanding the claim that it will be required to pay out 46% of shareholder equity. As a threshold matter, the Plan contests this figure, arguing that Concrete Pipe, a wholly owned subsidiary of Concrete Pipe & Products Co., Inc., was simply "formed to facilitate the purchase . . . of certain assets of Cen-Vi-Ro," Brief for Respondent 2, and that the relevant issue turns on the diminution of net worth of the parent company, not Concrete Pipe. See Tr. of Oral Arg. 29. But this dispute need not be resolved, for even assuming that Concrete Pipe has used the appropriate measure in determining the portion of net worth required to be paid out, our cases have long established that mere diminution in the value of property, however serious, is insufficient to demonstrate a taking. See, e. g., Village of Euclid v. Ambler Realty Co., 272 U. S. 365, 384 (1926) (approximately 75% diminution in value); Hadacheck v. Sebastian, 239 U. S. 394, 405 (1915) (92.5% diminution).
The final factor is the degree of interference with Concrete Pipe's "reasonable investment-backed expectations." 475 U. S., at 226. Again, Connolly controls. At the time Concrete Pipe purchased Cen-Vi-Ro and began its contributions to the Plan, pension plans had long been subject to federal regulation, and " '[t]hose who do business in the regulated field cannot object if the legislative scheme is buttressed by subsequent amendments to achieve the legislative end.' FHA v. The Darlington, Inc., 358 U. S. 84, 91 (1958). See
645
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