We consider a general equilibrium model under imperfect competition. Firms have constantreturns, they are price taker in the input market and compete à la Cournot in theproduct market. We assume a representative consumer exists. We show that an increase inthe number of firms of a given market...

1- 10% of the inhabitants of France move every year.2- Residential mobility has increased during the last thirty years, but with slowing downsand even recesses when the economic conditions were low.3- An important part of the population stays in the same region during their active life ;another...

Answers to various questions of applied macroeconomics depend on the values given toelasticities of substitution between the demands for factors, these demands being aggregatedacross productive sectors. Such elasticities reflect not only substitutabilities within productiveprocesses, but also...