We exploit rules of class formation to identify the causal effect of increasing the number of immigrants in a classroom on natives test scores, keeping class size constant (Pure Composition Effect). We explain why this is a relevant policy parameter although it has been neglected so far. We show...

There is relatively little research on peer effects in teenage motherhood despite the fact that peer effects, and in particular social interaction within the family, is likely to be important. We estimate the impact of an elder sister’s teenage fertility on the teenage childbearing of their...

Parents with higher education levels have children with higher education levels. Is this because parental education actually changes the outcomes of children, suggesting an important spillover of education policies, or is it merely that more able individuals who have higher education also have...