students in economics. We manipulated the composition of groups to achieve a wide range of support, and assigned students … students of low and medium ability gain on average 0.2 SD units of achievement from switching from ability mixing to three …-way tracking. Their dropout rate is reduced by 15 percentage points (relative to a mean of 0.6). High-ability students are …

There is a perception among native born parents in the U.S. that the increasing number of immigrant students in schools … though negligible peer effects of Limited English (LE) students on achievement of other students, potential peer effects of … selectivity across time and schools. On average we find no evidence of negative peer effects of LE students on females and white …

-performing third grade students in Colombia, to study whether providing educational support to low-achieving students affects the …-form effect on higher-achieving students as a spillover effect within treated schools. We then estimate a linear-in-means model of … explore several mechanisms, including teachers’ effort, students’ misbehavior, and peer-to-peer interactions. Our findings show …