Using a rich dataset of primary school students in the Netherlands, this paper investigates the hetero- geneous effects of immigrant concentration in the classroom on the academic achievement of natives. To identify the treatment effect, it takes advantage of some features of the Dutch primary...

Using a rich dataset of primary school students in the Netherlands, this paper investigates the effects of immigrant concentration in the classroom on the academic achievement of natives. It exploits rare information on age-at-migration to estimate separate spillover effects by duration of stay...