We present a model in which workers have to be educated to get employed and firms have to innovate in order to increase productivity. Education as well as innovation and production require skilled labour as inputs. This and the fact that learning opportunities differ across workers determine...

This Paper addresses the question: why and where do immigrants cluster? We examine the relative importance and interaction of two alternative explanations of immigrant clustering: (1) network externalities and (2) herd behavior. We advance the theory by presenting a framework encompassing both...

Empirical studies in the migration literature have shown that migration enclaves (networks) negatively affect the language proficiency of migrants. These studies, however, ignore the choice of location as a function of language skills. Using data on Mexican migration to the US, we show that...