Cournot-Walras and Cournot equilibria in mixed markets: A comparison

Summary In this paper, we show that, in markets with a continuum of traders and atoms, the set of Cournot-Walras equilibria and the set of Cournot equilibria may be disjoint. We show also that, when the preferences of the traders are represented by Cobb-Douglas utility functions, the set of Cournot-Walras equilibria and the set of Cournot equilibria have a nonempty intersection.I would like to thank R. Amir, B. de Meyer, J. J. Gabszewicz, J.-F. Mertens, H. Polemarchakis and L. Ventura for some helpful discussions about the questions examined in the present work.