In antitrust law, the conclusion that tying the sale of a second product to a patented product is automatically illegal has been accepted by courts for forty years. Under this theory, tying is harmful because it creates a new monopoly wholly outside the patent. Conditioning the sale or lease of one commodity on the sale or lease of another, a practice known as a tying agreement or a tie-in, is generally considered a trade-restraining device. The recent Report of the Attorney General\u27s Committee to Study the Antitrust Laws declares that the purpose of a tying contract is monopolistic exploitation. This exploitation is achieved by artificially extending the market for the \u27tied\u27 product beyond the consumer acceptance it would rate i...