Cite as: 514 U. S. 211 (1995)
Opinion of the Court
so, petitioners argue, federal courts must apply the "new" law created by § 27A(b) in finally adjudicated cases as well; for the line that separates lower court judgments that are pending on appeal (or may still be appealed), from lower court judgments that are final, is determined by statute, see, e. g., 28 U. S. C. § 2107(a) (30-day time limit for appeal to federal court of appeals), and so cannot possibly be a constitutional line. But a distinction between judgments from which all appeals have been forgone or completed, and judgments that remain on appeal (or subject to being appealed), is implicit in what Article III creates: not a batch of unconnected courts, but a judicial department composed of "inferior Courts" and "one supreme Court." Within that hierarchy, the decision of an inferior court is not (unless the time for appeal has expired) the final word of the department as a whole. It is the obligation of the last court in the hierarchy that rules on the case to give effect to Congress's latest enactment, even when that has the effect of overturning the judgment of an inferior court, since each court, at every level, must "decide according to existing laws." Schooner Peggy, supra, at 109. Having achieved finality, however, a judicial decision becomes the last word of the judicial department with regard to a particular case or controversy, and Congress may not declare by retroactive legislation that the law applicable to that very case was something other than what the courts said it was. Finality of a legal judgment is determined by statute, just as entitlement to a government benefit is a statutory creation; but that no more deprives the former of its constitutional significance for separation-of-powers analysis than it deprives the latter of its significance for due process purposes. See, e. g., Cleveland Bd. of Ed. v. Loudermill, 470 U. S. 532 (1985); Meachum v. Fano, 427 U. S. 215 (1976).
To be sure, § 27A(b) reopens (or directs the reopening of) final judgments in a whole class of cases rather than in a particular suit. We do not see how that makes any differ-
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