In strictly regular economies limited arbitrage is sufficient for the global invertibility of demand, and necessary and sufficient for the uniqueness of equilibrium. This result is established using algebraic topology and holds in economies with short sales, and with finitely or infinitely many...

Different forms of resource allocation - by markets, cooperative games, and by social choice - are unified by one condition, limited arbitrage, which is defined on the endowments and the preferences of the traders of an Arrow Debreu economy. Limited arbitrage is necessary and sufficient for the...