We present a new condition on beliefs that guarantee the Bayesian implementability of all efficient social decision rules. We show that this condition is easy to verify and is both more interpretable and more general than the conditions that are found in the literature. We also study conditions...

[eng] Price competition and cournotian equilibria. . Contrary to a widespread belief, strategie choices described by the Cournotian model are not confined to quantities. Only, price strategies are constrained by the fact that « the priee is necessarily the same » for producers of a homogeneous...

The cyclical behavior of wages and prices was a central topic in trade cycle analysis on the eve of the Second World War. Keynes and Harrod independently referred in the same year to the supposed countercyclicality of real wages, a feature that was contested soon after, on empirical grounds, by...