In a horizontal product differentiation model, we show conditions under which Cournot competition (which implies some form of price coordination) allows a larger number of firms to operate in the industry than Bertrand competition. In turn, total welfare is higher under Cournot than under...

Imperfect competition is a meaningful feature for macroeconomic analysis only to the extent that is leads to properties qualitatively different from those obtained under perfect competition. In particular, we have to wonder how imperfect competition per se may find an alternative fiscal policy....

vVe analyse an overlapping generations economy with Cournotian monopolistic competition in the produced goods markets and perfect competition in the labour market. All prices are perfectly flexible and no adjustments costs are introduced. We show that these features lead to properties...

We examine two variants of the monopolistic competition model of Dixit and Stiglitz (1993). One is a simple general equilibrium model with n produced monopolistic goods and a numeraire good, the other in an "enlarged model", that includes labor time an an addiitonal good. In the case of alarge...

Properties of stochastic outcome functions are exploited to solve the moral hazard problem in teams under unobservable individual actions and different individual objectives. Two kinds of enforcement mechanisms are considered: Enforcement through utility transfers and enforcement through...

We analyse the sharing of an uncertain joint output among risk-neutral members of a team whose actions are not observable. Adapting techniques used to treat the pure adverse selection problem to this team moral hazard problem, we define a first condition that is sufficient to implement a first...

Our goal is to describe the state of the art on Bayesian mechanisms when utility is transferable and only balanced transfers are admissible. New results will be proved along the way, but they will be integrated to the overall picture. We first study a condition on the information structure of...