482
Opinion of the Court
ket for antitrust purposes is determined by the choices available to Kodak equipment owners. See Jefferson Parish, 466 U. S., at 19. Because service and parts for Kodak equipment are not interchangeable with other manufacturers' service and parts, the relevant market from the Kodak equipment owner's perspective is composed of only those companies that service Kodak machines. See Du Pont, 351 U. S., at 404 ("The market is composed of products that have reasonable interchangeability").30 This Court's prior cases support the proposition that in some instances one brand of a product can constitute a separate market. See National Collegiate Athletic Assn., 468 U. S., at 101-102, 111-112; International Boxing Club of New York, Inc. v. United States, 358 U. S. 242, 249-252 (1959); International Business Machines Corp. v. United States, 298 U. S. 131 (1936).31 The proper market definition in this case can be determined only after a factual inquiry into the "commercial realities" faced by consumers. United States v. Grinnell Corp., 384 U. S., at 572.
B
The second element of a § 2 claim is the use of monopoly power "to foreclose competition, to gain a competitive advan-30 Kodak erroneously contends that this Court in Du Pont rejected the notion that a relevant market could be limited to one brand. Brief for Petitioner 33. The Court simply held in Du Pont that one brand does not necessarily constitute a relevant market if substitutes are available. 351 U. S., at 393. See also Boxing Club, 358 U. S., at 249-250. Here respondents contend there are no substitutes.
31 Other courts have limited the market to parts for a particular brand of equipment. See, e. g., International Logistics Group, Ltd. v. Chrysler Corp., 884 F. 2d 904, 905, 908 (CA6 1989) (parts for Chrysler cars is the relevant market), cert. denied, 494 U. S. 1066 (1990); Dimidowich v. Bell & Howell, 803 F. 2d 1473, 1480-1481, n. 3 (CA9 1986), modified, 810 F. 2d 1517 (1987) (service for Bell & Howell equipment is the relevant market); In re General Motors Corp., 99 F. T. C. 464, 554, 584 (1982) (crash parts for General Motors cars is the relevant market); Heatransfer Corp. v. Volkswagenwerk A. G., 553 F. 2d 964 (CA5 1977) (air conditioners for Volkswagens is the relevant market), cert. denied, 434 U. S. 1087 (1978).
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