Much of the interest in tying arrangements comes from the prominent place that tying law has in antitrust law. Tying arrangements have long been suspect in antitrust courts due to the intuitive potential that they seem to have for foreclosure. For decades, ties have been challenged on some version of a theory that competition in the tied market must be reduced, since those who buy both the tied and the tying products are not available as customers to single product sellers in the tied market…..