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...

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...

We investigate the existence conditions of involuntary unemployment in an overlapping generations model with an imperfect output market. At the temporary equilibrium, unemployment is involuntary if it exists whatever the nominal wage. The study of the price-elasticity components gives us two...

We consider a simple general equilibrium model with imperfect competition on the labor market. We show that on this market a rise in the number of trade unions may reduce the employment level. This result depends on the properties of the nominal wage-elasticity of the labor demand. It is...