In this paper we discuss the interest of applying differential co-payment rates across alternative medical treatments. Two treatment strategies are considered: a "long term strategy" in which patients apply preventive measures before knowing if they have the desease and an "emergency strategy"...

In this note we show that the equilibrium characterized by Biais, Martimort and Rochet (Econometrica, 78, 2000) could have been characterized by using direct mechanisms.

This paper provides a model of nonlinear income taxation in a context of international mobility. We consider two identical countries, in which each government chooses non-cooperatively redistributive taxes. It is shown that when skilled workers can move at low cost, the income taxation does not...

Within a framework of optimal taxation a la Mirrlees, we add a new heterogeneity between the individuals who differ not only on their marginal productivity, but also on their initial endowment in a good which is interpreted as an aggregate consumption. We consider other goods in the economy...

In this note, we argue that in Common Agency games the restriction todeterministic menus is critical. We give an simple example, with complete information and no moral hazard,where an equilibrium is not robust to the introduction of stochastic menus.