This note illustrates the fact that the number of active firms in free entry equilibrium may be largely indeterminate and different levels of positive profits may in many cases be sustained. This is shown to be true, in spite of market contestability, either under Cournot competition or under...

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...

The special issue of Annales d'Economie et Statistique presented here comes out of an international conference which was held in Marseilles (GREQAM) in June 1994 in connection with a programme of Commissariat General au Plan and with the support of ADRES. Sixty scholars, specialists in economic...