In this paper, from the excess utility function we obtain a binary relation in the social weights space and then, for an infinite dimensional economy, we prove the existence of equilibrium in our approach we don't suppose the existence of a demand function. Finally, we obtain a condition for the...

Prime objects of this note are (I) excess demand generated by price-taking economic agents, and (II) an alternative version of tatonnement. We relate laws of demand, axioms of revealed preferences, and other notions of generalized monotonicity to evolutionary stable prices. Focus is on local...

Sont presentees ici quelques reflexions portant sur la dynamique de la mondialisation, de la competition, du reseautage et du processus decisionnel collectif.

The endogeneity of preferences implies that not only individual preferences -along with technologies, government policies, and the organization of society and markets- determine economic outcomes, but also that the economic, social, legal, and cultural structure of society affects preferences....

This paper presenta a general equilibrium model of imperfect competition in which firm efficiency depends on the level of product market competition. X-efficiency is shown to arise to the extent unions directly affect the level of employment. A positive relationship is established between total...

The paper examines some issues linked to the integration of market power in general equilibrium. The first part reviews the different existing approaches: subjective and objective, in terms of quantities and in terms of prices. The second part presents a semi-competitive model, based on a sector...

A hierarchic price is a finite ordered family of price vectors {p1,...,pk}. It extends the notion of exchange values proposed by Gay (1978). These price notions were introduced in order to establish the existence of a competitive equilibrium without the strong survival assumption. It is well...

We give a simple example to the non-existence of duopoly equilibrium in pure strategies in an economy with two goods and two types of consumers.

Two basic properties concerning the dynamic behavior of competitive equilibria of exchange economies with complete markets are derived essentially from the fact that the Walras correspondence has no knots.

The paper introduces an abstract economy with imperfect competition; the choice of allocation takes place through an abstract mechanism, when produceres choose strategies and the outcome is (a set of) feasible allocations, where the consumers' choices are sustained by the market mechanism at...