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 disease and an emergency strategy where...

Using the standard non linear income and commodity taxation framework, we examine the optimal policy to be adopted when the same labour disutility can receive two opposite interpretations: taste for leisure and activity limitation. In the absence of complete information about individual...

Rochet (1989) showed that with distortionary income taxes, social insurance is a desirable redistributive device when risk and ability are negatively correlated. This finding is reexamined when ex post moral hazard and adverse selection are included, and under different informational...

This paper studies optimal linear income taxation and redistributive social insurance when the former has the traditional labor distortion and the latter generates both ex ante and ex post moral hazard. Private insurance is available and individuals differ in labor productivity and in loss...

Most work on tax competition argues that mobile factors tend to be undertaxed except if there is coordination of tax policies. Full coordination is not however always feasible, and as a consequence some measures of partial coordination have been proposed such as minimal witholding taxes on...

The present paper reviews key issues in pension design and pension reform encountered all across the world. The paper heavily refers to the recent U.S. Social Security reform debate in general and to the Personal Retirement Accounts proposal in particular. A particular emphasis is put on...