RT Journal Article SR Electronic T1 The Effect of Immigration on Natives’ School Performance: Does Length of Stay in the Host Country Matter? JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 1017-9151R2 DO 10.3368/jhr.55.3.1017-9151R2 A1 Laurent Bossavie YR 2018 UL http://jhr.uwpress.org/content/early/2018/09/04/jhr.55.3.1017-9151R2.abstract AB This paper investigates the effects of immigrant concentration in the classroom on natives’ scholastic achievement. It utilizes rare information on age at migration to estimate separate spillover effects by duration of stay of immigrant classmates, and uses cohort-by-cohort changes in immigrant concentration within schools to identify treatment effects. The presence of immigrant students who have been in the country for some time is found to have no effect on natives. However, a small negative effect of recent immigrants on natives’ language scores is reported. When significant, effect sizes are quite small compared to other educational interventions and peer effect estimates.