Several companies operated downhill ski facilities in Aspen, Colorado. They all sold a joint ticket that allowed skiers to ski at all facilities; the receipts were later divided according to various use rates. Eventually, one firm owned all the ski areas but one. This firm stopped issuing the joint ticket and instead issued a ticket good only for its ski areas. The firm that owned only one ski facility saw its market share fall from 20 percent to 11 percent. It sued, claiming that the larger firm violated Section 2 of the Sherman Act by attempting to monopolize skiing by ending the joint ticket arrangement.
Is the sale of the joint ticket a violation of the antitrust law? [Aspen Skiing Company v. Aspen Highlands Skiing Corporation, 472 U.S. 585, 105 S.Ct. 2847 (1985)]