Ascending price auctions typically involve a single price path with buyers paying their final bid price. Using this traditional definition, no ascending price auction can achieve the Vickrey-Clarke-Groves (VCG) outcome for general private valuations in the combinatorial auction setting. We relax...

We show in this paper how, in a model of assets exchange in complete competitive markets, heterogeneity of the agent’s sub jective probabilities generates aggregate expenditures for Arrow-Debreu securities that have the gross substitutability property, with the consequences that competitive...

Individuals exchange contracts for the deliveryof commodities in competitive markets and, simultaneously, act strategically; actions affect utilities across individuals directlyor through the payoffs of contracts. This encompasses economies with asymmetric information. Nash-Walras equilibria...

Markets are incomplete when the assets available to the agents do not span the space of future contingencies. Efficiency is then assessed by the weak criterion of "constrained efficiency" (efficiency relative to the set of allocations compatible with the asset structure). That criterion requires...

We consider a general equilibrium model with incomplete financial markets and nominal assets. Asset prices are given. Let D be the number of "missing" assets. If the number of agents is greater than 2(D+ 1) and the number of period zero commodities greater than (2D + 1), there is a dense,...

For the case of smooth concave exchange economies, we provide a characterization of the inner core as the set of feasible allocations such that no coalition can improve on it, even if coalitions are allowed to use some random plans. For the case of compactly generated games, we discuss Myerson's...

Equilibrium paths in an economy of overlapping generations are determinate. Time is either discrete or continuous; in either case, it extend into the infinite future and, possibly, the infinite past. There is one, nonstorable commodity at each date. The economy is stationary; intertemporal...

It is well known that a competititve equilibrium may fail to exist when preferences are possibly satiated. We show that this non-existence problem does not arise if one of the commodities is paper money. Moreover, an equilibrium is Pareto efficient in the economy with money. This paper therefore...

The introduction of banks that issue money and supply balances and pay out their profis as dividends is the natural modification of the model of general competitive equilibrium that encompasses monetary economies with an operative transactions technology. Monetary policy sets nominal rates of...

Asymmetric information concerns either commodities or mutually exclusive states of the world. The notion of competitive equilibrium differs between the two cases. In particular, incentive compatibility constraints are only relevant in the case of asymmetric information concerning mutually...