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...

This paper examines the role of heterogeneous beliefs in a cobweb model. We proceed in two stages. First, two groups of agents are distinguished. They are either fundamentalists, or chartists. The latter specify the expected price from an adaptive process, the former have a "rational behaviour"....

In an OG model with competition à la Cournot, we show the existence of a stable 2-cylcle (in prices and employment levels) in the forward dynamics with learning.

We consider the general equilibrium of an economy with Cournot competition in the product market. In this framework, firms endowed with market power are assumed to know the true or objective demand function. However, depending on the economy's structure, the demand function varies with the size...

We study the link between involuntary unemployment and income feedback effects in a model with an imperfect product market. We provide a condition based on the demand such that full employment prevails when income feedback effects are neglected, while involuntary unemployment appears when they...

We investigate the link between "underemployment at all wages" and income feedback effects due to firms' activities in an economy with imperfect competition in the product markets. The size of income feedback effects negatively depends on the number of product markets. We strengthen a previous...

We investigate the dynamics of a cobweb model with heterogeneous beliefs, generalizing the example of Brock and Hommes (1997). We examine situations where the agents form expectations by using either rational expectations, or a type of adaptive expectations with limited memory defined from the...