Citizens have a right to accept any job offer in their country, but that right is not marketable or automatically extended to foreigners. Yet, some citizens have useful things to do if they could rent out their right-to-work, and there are foreigners who would value the new options for...

Using a rich data set of primary school students, this paper estimates the effects of immigrant concentration in the classroom on the academic achievement of natives. In contrast with previous contributions, it exploits rare information on age-at-migration to estimate separate spillover effects...