Was the increase in income inequality in the US due to permanent shocks or merely to anincrease in the variance of transitory shocks? The implications for consumption and welfaredepend crucially on the answer to this question. We use CEX repeated cross-section data onconsumption and income to...

A review of the basic theory of optimal open-source software contributions points to three keyfactors affecting supply: non-pecuniary benefits, future expected monetary returns, and opensourcelicence type...

This paper considers the statistical analysis of large panel data sets where even afterconditioning on common observed effects the cross section units might remain dependentlydistributed. This could arise when the cross section units are subject to unobserved commoneffects and/or if there are...

This study analyzes the treatment effects of public training programs for the unemployed inGermany. Based on propensity score matching methods we extend the picture that has beensketched in previous studies by estimating treatment effects of medium-term programs fordifferent sub-groups with...

It is argued that migration from Mexico to the US and its corresponding return migration aredetermined by international wage differentials and preferences for origin. We use a model ofjob search, savings and migration to show that job turnover is a crucial determinant of themigration process...

Labor markets in the transition economies of Central and Eastern Europe underwent adramatic transformation. Notably, this transformation took place within just a few years. Untilthe mid-2000s job opportunities were scarce and unemployment was high. But since thenlabor demand has picked up and...

'Marginal employment', i.e. employment at low working hours and earnings not covered bysocial security, has been gaining importance in the German economy over the past decade.Using a large newly available panel data set and statistical matching techniques, we analysethe effects of marginal...

When treatment effects of active labour market programmes are heterogeneous in anobservable way across the population, the allocation of the unemployed into differentprogrammes becomes a particularly important issue. In this paper, we present a statisticalmodel designed to improve the present...