This paper seeks to point out and to correct some mistakes of the conventional theory of imperfect competition based on partial equilibrium analysis. It extends to imperfect competition the classical model of general equilibrium, signaling the interconnections between individual prices and...

We decentralize incentive efficient allocations in large adverse selection economies by introducing a Walrasian market for mechanisms, that is, for menus of contracts. Facing a budget constraint, informed individuals purchase (lottery) tickets to enter mechanisms, while firms sell tickets and...