In an economy with a non-atomic measure space of assets and exchangeable risks, the Arbitrage Pricing Theory (APT) holds exactly; and factors are structurally specified, which allows for an economic interpretation.

The coordinating role of a redundant security is its role in markets with transaction costs to coordinate different consumers’ security demands so as to clear all security markets and, simultaneously, attain a given commodity allocation. The purpose of this paper is to prove that, under some...

In an economy with a non-atomic measure space of assets and exchangeable risks, the Arbitrage pricing Theory (APT) holds exactly; and factors are structurally specified, which allows for an economic interpretation.

We propose an objective for the firm in a model of production economies extending over time under uncertainty and with incomplete markets. We derive the objective of the firm from the assumption of initial-shareholders efficiency. Each shareholder is assumed to communicate to the firm her...

The asset market is incomplete. Fix-price equilibria exist. Price regulation Pareto improves on a competitive allocation. Prices in competitive markets may fail to attain equilibrium. The theory of general competitive equilibrium does not account for the adjustment of prices; empirical evidence...

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

The present note highlights the seminal contributions of Diamond, Drèze and Radner towards the integration of financial markets into general equilibrium modeling.

We reconsider the well-known result of Arrow (1953) that the set of equilibria of an economy with complete markets coincides with the one of an economy with sequentially complete markets. We show by means of two examples that this result is problematic when there exist multiple equilibrium...

In an incomplete asset market, firms compute the value of production plans by approximating them with the payoffs of portfolios of marketed assets; equivalently, by projecting their payoffs on the span of the payoffs of marketed assets; equivalently, they apply the capital asset pricing model...

We discuss the issue, raised by Mas-Colell (1991) whether the local uniqueness (relative to the L∞ topology) may be a generic property of equilibria in incomplete markets economies with a continuum of states.