We investigate the optimal design of a committee in a model with the endogenous participation of experts who have private information about their own abilities. We study three different dimensions of committee design: members' wages, the number of seats, and the communication system. We show...

Adverse selection induces economic limits to market substitution. If quality uncertainty persists in both internet and traditional marketplaces, a second-best equilibrium with parallel market segments may arise. Positive trade in parallel segments implies that the information cost advantage of...