Arbitration in classical Athens

Abstract

The Classical Athenians developed two formal arbitration procedures. They assigned low stakes disputes to a panel of arbitrators, while high stakes cases were handled by a single arbitrator. Given the information aggregation benefit of collective decision making, one would have expected more individuals to be assigned to more important cases. I develop a theoretical model to provide an explanation for their design. Recognizing that arbitrator competence is endogenous, effort put into making a good decision takes time and effort. In larger groups free riding is a concern. Consequently, there exists environments where the free-riding loss is magnified in higher stakes disputes to the point where the socially optimal panel size is inversely related to the stakes involved.