An important result in convex analysis is the duality between a closed convex set and its support function. We exploit this duality to develop a novel geometric approach to mechanism design. For a general class of social choice problems we characterize the feasible set, which is closed and...

In this paper we analyze the problem of the enforcement of incomplete contracts with endogenous outside options. Some of the equilibria we outline may reverse one of the main results presented in the standard literature. We then revisit the literature on the highly debated Fisher Body/General...

This paper studies an incomplete contract framework in which specific investments affect parties’ outside options. We show that the ‘direction’ of standard hold-up in this new framework strictly depends on the impact generated by investments on ex-post parties’ outside options. This...

In sequential auctions objects are sold one by one in separate auctions. These sequential auctions might be organised as sequential first-price, second-price, or English auctions. We will derive equilibrium bidding strategies for these auctions. Theoretical models suggest that prices in...

We report on a series of experiments that test the effects of an uncertain supply on the formation of bids and prices in sequential first-price auctions with private-independent values and unit-demands. Supply is assumed uncertain when buyers do not know the exact number of units to be sold...