Certain tying arrangements are illegal in the
United States under both the
Sherman Antitrust Act,
[2] and Section 3 of the
Clayton Act.
[3] A tying arrangement is defined as "an agreement by a party to sell one product but only on the condition that the buyer also purchases a different (or tied) product, or at least agrees he will not purchase the product from any other supplier."
[4] Tying may be the action of several companies as well as the work of just one firm. Success on a tying claim typically requires proof of four elements: (1) two separate products or services are involved; (2) the purchase of the tying product is conditioned on the additional purchase of the tied product; (3) the seller has sufficient market power in the market for the tying product; (4) a not insubstantial amount of interstate commerce in the tied product market is affected.
[5