A simple version of the Demand Commitment Game is shown to implement the Shapley value as the unique subgame perfect equilibrium outcome for any n-person characteristic function game. This improves upon previous models devoted to this implementation problem in terms of one or more of the...

Markets involve the exchange of information and products between buyers and sellers in marketplaces created by market organizers. This paper develops a theory to explain the differences in the size (number of participants) and diversity (range of products displayed) across these marketplaces. We...