We develop a methodology to sign output distortions in the random participation framework. We apply our method to monopoly nonlinear pricing problem, to the regulatory monopoly problem and mainly to the optimal income tax problem. In the latter framework, individuals are heterogeneous across two...

This paper develops a general method to solve the optimal nonlinear income tax model with one action (individual pre-tax income) and multidimensional characteristics. Individuals differ in terms of skills and belong to different groups. A group is a subset of individuals with the same vector of...

This paper explores the use of workfare as part of a tax mix when labor supply responses are along the extensive margin. In an economy where the government has a priori chosen any tax-and-bene?t schedule, we show that, despite their common goal of providing additional incentives for individuals...

This paper studies the optimal income redistribution and optimal monitoring when disabil- ity bene?ts are intended for disabled people but some of the disabled do not claim disability bene?ts and enter the labor force. Classi?cation errors also occur. Some able applicants with high distaste for...

We consider an economy in which agents di¤er in terms of productivity (that may be either high or low) as well as in their preferences for labour. Individuals decide whether or not they enter the labour force. In this context and under asymmetric information, the optimal tax schedules derived...