We present a theory of collusive pricing in markets subject to business cycle fluctuations. In the business cycle model …

condemnation of this practice has been the court's belief in what has come to be known as the "leverage theory" of tying: that is … power to foreclose sales in, and thereby monopolize, a second market. In recent years, however, the leverage theory has come … used by the critics of the leverage theory which all assume that the tied good market has a competitive, constant returns …