We use data from a Norwegian field experiment where young students were taught mathematics in small, homogenous groups to investigate how treatment effects varied across middle-achieving students dependent on their rank order and their tutors’ instructional practices. We find that individuals...

We use data from a Norwegian field experiment where young students were taught mathematics in small, homogenous groups to investigate how treatment effects varied across middle-achieving students dependent on their rank order and their tutors' instructional practices. We find that individuals...

This paper studies how peers in school affect students' mental health. Guided by a theoretical framework, we find that increasing students' relative ranks in their cohorts by one standard deviation improves their mental health by 6% of a standard deviation conditional on own ability. These...