Chichilnisky (1997) claims that another variant of her condition limiting arbitrage is necessary and sufficient for existence of equilibrium and nonemptiness of the core in an economy with short sales allowing half lines in indifference surfaces. Her proof, however, is based on a proposition...

We introduce a model of network formation whose primitives consist of a feasible set of networks, player preferences, rules of network formation, and a dominance relation on feasible networks. Rules may range from noncooperative, where players may only act unilaterally, to cooperative, where...

We model strategic competition between product differentiated oligopolists in a market with privately informed buyers as an abstract game over market situations. In this game each firm's strategy space consists of a set of catalogs--and each catalog in turn consists of a set of products and...

We make two main contributions to the theory of optimal income taxation. First, assuming conditions sufficient for existence of a Pareto optimal income tax and public goods mechanism, we show that if, in addition, agents' preferences satisfy an extended notion of single crossing called capacity...

We formulate a club model where players' have identical single-peaked preferences over club sizes as a network formation game. For situations with "many" clubs, we provide necessary and sufficient for non-emptiness of the farsighted core and the direct (or myopic) core. With "too few" clubs, if...

Modeling club structures as bipartite directed networks, we formulate the problem of club formation with multiple memberships as a noncooperative game of network formation and identify conditions on network formation rules and players' network payoffs sufficient to guarantee that the game has a...