Several studies, most of them employing straightforward regression analysis, have concluded that immigrants' proficiency in the language of their adopted country is correlated with their productivity, as measured by earnings. Two weaknesses of these studies are potential unobserved...

In this paper, I study temporary migrations, and its consequences for immigrants' behaviour. I distinguish between temporary migrations where the return time is exogenous, and temporary migrations where the migrant chooses when to return. I then illustrate the consequences both types of...