Cite as: 535 U. S. 467 (2002)
Opinion of the Court
750-751. The Eighth Circuit added, however, that if it were wrong and TELRIC were permitted, the claim that in prescribing TELRIC the FCC had effected an unconstitutional taking would not be "ripe" until "resulting rates have been determined and applied." Id., at 753-754.
The Court of Appeals also, and for the second time, invalidated Rules 315(c)-(f), 47 CFR §§ 51.315(c)-(f) (1997), the FCC's so-called "additional combination" rules, apparently for the same reason it had rejected them before, when it struck down Rule 315(b), the main combination rule. 219 F. 3d, at 758-759. In brief, the rules require an incumbent carrier, upon request and compensation, to "perform the functions necessary to combine" network elements for an entrant, unless the combination is not "technically feasible." Id., at 759. The Eighth Circuit read the language of § 251(c)(3), with its reference to "allow[ing] requesting carriers to combine . . . elements," as unambiguously requiring a requesting carrier, not a providing incumbent, to do any and all combining. Ibid.
Before us, the incumbent local-exchange carriers claim error in the Eighth Circuit's holding that a "forward-looking cost" methodology (as opposed to the use of "historical" cost) is consistent with § 252(d)(1), and its conclusion that the use of the TELRIC forward-looking cost methodology presents no "ripe" takings claim. The FCC and the entrants, on the other side, seek review of the Eighth Circuit's invalidation of the TELRIC methodology and the additional combination rules. We granted certiorari, 531 U. S. 1124 (2001), and now affirm on the issues raised by the incumbents, and reverse on those raised by the FCC and the entrants.
III
A
The incumbent carriers' first attack charges the FCC with ignoring the plain meaning of the word "cost" as it occurs
497
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