Empirical evidence for the US shows that migrants increase the productivity of regions. To explain the impact of migrants on the average firm productivity we construct a general equilibrium model with monopolistic competition a la Melitz (2003). We consider heterogeneous firms with different...

Economic debate about the consequences of immigration in Germany has largely focused on the wage effects for natives at an aggregate level. Especially the role of imperfect substitutability of migrants and natives gained importance. A new micro oriented approach is to focus on the firm level by...

Economic debate about the consequences of immigration in Germany has largely focused on the wage effects for natives at an aggregate level. Especially the role of imperfect substitutability of migrants and natives gained importance. A new topic is to focus on the firm level by estimating...

Building on a large administrative micro data set for the time span 19752004 we look at lifetime unemployment for West German birth cohorts 1950 to 1954. Descriptive evidence shows a highly uneven distribution of unemployment in West Germany more than 60% of the individuals in our sample were...

The empirical literature on unemployment almost exclusively focuses on the duration of distinct unemployment spells. In contrast, we use a large German administrative micro data set for the time span 1975-2004 to investigate individual lifetime unemployment (defined as the total length of all...