In economies with competitive labour markets social policies harm employment and output. In Europe, in particular, non-competitive labour markets with trade unions, efficiency wages and/or costly search and mismatch seem more realistic. Social policies such as progressive taxation or...

This paper characterizes the optimal redistributive taxation when individuals are heterogeneous in two exogenous dimensions: their skills and their values of non-market activities. Search-matching frictions on the labor markets create unemployment. Wages, labor demand and participation are...