In a world where firms are oligopolists, is it possible to create a customs union that raises the welfare of member countries without hurting non-members countries? We give sufficient conditions for an affirmative answer.

A model of location choice by Cournot oligopolists is presented, under the assumption that R&D spillovers depend on the distance between firms. We show that a variety of patters emerge. Agglomeration is optimal under certain assumptions. Geographical dispersion in a two- dimensional plane is...

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,...

The purpose of this paper is to analyse the effect of upstream cost asymmetries on the behavior of integrated firms. The model highlights the respective roles of strategic considerations and of cost considerations in the determination of an integrated firm's interaction with the non integrated...

This paper studies the optimal production subsidies for domestic firms that compete in an export market against each other as well as against foreign rivals. Assuming that all firms do not have identical cost curves, it shows that the optimal policy for the home government is to give the more...

We show that under Bertrand competition, firms may have an incentive to transfer real ressources to a joint venture operating in an unrelated market. The optimal transfers are typically asymmetric, in order to reduce the extent of rivalry in the oligopoly.