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...

This paper considers a model of oligopolistic competition and locational choice that incorporates the notion of regional industrial systems. Firms play a non cooperative game where the strategy set of firms is given by a set of existing industrial districts. Each firm is distinguished by its...

On presente dans cet article un cadre general -celui de la "concurrence monopolistique cournotienne" - permettant de mettre en valeur la maniere dont la concurrence sur le marche des biens peut, en presence de rendements croissants et d'une variabilite des facteurs de marge, etre a l'origine de...

This paper shows that if domestic firms do not have identical unit costs, then the interplay between the Herfindahl index of concentration and the elasticity of the slope of the demand curve is of major importance in the determination of optimal trade policies. When the demand curve is concave,...

In this paper we show that a strict liability fine, established on the marginal damages caused by production act as a mean to discriminate between firms. More precisely, facing a potential risk, understood as a random negative externality, "ex ante" identical rival firms playing on a competitive...