This volume gathers some of the finest and most recent research in economic and political design. Among the authors are several most prominent academics as well as many new and promising researchers. They investigate social choice and electoral systems, auctions, matching, bargaining, coalitional stability and efficiency, regulation, the design of rights, mechanisms, games, hierarchies and information. The book is bound to become a standard reference as a collection displaying where we are and where we are going in a broad spectrum of areas in economic design.