In the case of an economy with production, we unify McKenzie-Debreu's and Arrow-Hahn's concepts of irreductibility by a generalization of the Bergstrom-irreductibility. This, together with existence of a quasi-equilibrium, will be shown to imply existence of a Walras equilibrium.

We study a general equilibrium model with micro-economic risk in which agents maximize an rand-dependent-expected-utility. Financial markets are complete. Under the assumption of weak risk aversion, all agents are prefectly insured at equilibrium. If, furthermore, agents are strongly risk...

This paper investigate the existence of asymmetric equilibria in a pure exchange economy with individual risks. The model is an extension of Malinvaud's (1973). Agents face identical pure individual risks: their endowments and utility functions only depend on their individual state; but there...

This paper investigates necessary conditions for an equilibrium to exist on a reinsurance market with short sale constraints. It establishes that, equilibrium, there exists an equivalent probability measure under which the reinsurance premium is the compensator of the jump process describing the...

The purpose of this paper is to study how the equilibrium, in a linear exchange equilibrium varies, with respect to the initial endowments and the utility vectors.