This paper provides sufficient conditions for the existence of a unique Cournot equilibrium. Previous uniqueness results have depended on an assumption of nondegeneracy of equilibrium. As the authors illustrate, this assumption often fails in multistage games with proper Cournot subgames. Since...

In this paper, two results are presented. Both refer to the impossibility theorem of Polemarchakis (1983). The Slutsky matrix of intratemporal and intertemporal substitution effects, associated with the individual short-run demand functions, is not arbitrary, but symmetric, if expectations are...