428
Opinion of the Court
anty Trust: "[W]here a federal court is exercising jurisdiction solely because of the diversity of citizenship of the parties, the outcome of the litigation in the federal court should be substantially the same, so far as legal rules determine the outcome of a litigation, as it would be if tried in a State court." Ibid.; see also Ragan v. Merchants Transfer & Warehouse Co., 337 U. S. 530, 533 (1949) (when local law that creates the cause of action qualifies it, "federal court must follow suit," for "a different measure of the cause of action in one court than in the other [would transgress] the principle of Erie"). A later pathmarking case, qualifying Guaranty Trust, explained that the "outcome-determination" test must not be applied mechanically to sweep in all manner of variations; instead, its application must be guided by "the twin aims of the Erie rule: discouragement of forum-shopping and avoidance of inequitable administration of the laws." Hanna v. Plumer, 380 U. S. 460, 468 (1965).
Informed by these decisions, we address the question whether New York's "deviates materially" standard, codified in CPLR § 5501(c), is outcome affective in this sense: Would "application of the [standard] . . . have so important an effect upon the fortunes of one or both of the litigants that failure to [apply] it would [unfairly discriminate against citizens of the forum State, or] be likely to cause a plaintiff to choose the federal court"? Id., at 468, n. 9.8
We start from a point the parties do not debate. Gasperini acknowledges that a statutory cap on damages would supply substantive law for Erie purposes. See Reply Brief for
8 Hanna keyed the question to Erie's "twin aims"; in full, Hanna instructed federal courts to ask "whether application of the [State's] rule would make so important a difference to the character or result of the litigation that failure to enforce it would unfairly discriminate against citizens of the forum State, or whether application of the rule would have so important an effect upon the fortunes of one or both of the litigants that failure to enforce it would be likely to cause a plaintiff to choose the federal court." 380 U. S., at 468, n. 9.
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