achievement. The analysis is based on longitudinal administrative data on two cohorts of vocational training students in Italy … only disproportionately high shares of immigrants but also the lowest ability native students. We adopt a value added model … average effects on maths test scores that are larger for low ability native students, strongly non-linear and only observable …

students from majors in which they have a relative ability advantage, with adverse consequences on academic performance, entry …

students from majors in which they have a relative ability advantage, with adverse consequences on academic performance, entry …

Education policies depend in part on the presence of externalities, but very little evidence exists to confirm the … existence of such externalities. In this paper we investigate if there are spillover effects from education within peer groups … effect differs across length and type of education, as well as across occupations and peer group- and workplace size. …

This paper uses random assignment of students to investigate the impact of study groups and roommates on academic … lower ability students benefit from high ability students but not vice versa …