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Monopoly power is the ability to control prices and exclude competition in a given market.[1] If a firm can profitably raise prices without causing competing firms to expand output and drive down prices, that firm has monopoly power.[2]

Proving the existence of monopoly power through indirect evidence requires a definition of the relevant market.[3]


  1. United States v. Grinnell Corp., 384 U.S. 563, 571 (1966)(full-text).
  2. Harrison Aire, Inc. v. Aerostar Int'l, Inc., 423 F.3d 374, 380 (3d Cir. 2005)(full-text).
  3. See SmithKline Corp. v. Eli Lilly & Co., 575 F.2d 1056, 1062-63 (3d Cir. 1978)(full-text).