United States antitrust law
United States v. Alcoa, 148 F.2d 416 (2d Cir. 1945), is a landmark decision concerning United States antitrust law. Judge Learned Hand's opinion is notable for its discussion of determining the relevant market for market share analysis and—more importantly—its discussion of the circumstances under which a monopoly is guilty of monopolization under section 2 of the Sherman Antitrust Act.