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 …

effect on the individual decision to attend university and observe stronger peer effects among groups of students of similar …

We exploit the randomized evaluation of a remedying education intervention that improved the reading skills of low …-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 …