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Children's outcomes are strongly correlated with those of their neighbours. The extent to which this is causal is the subject of an extensive literature. There is an identification problem because people with similar characteristics are observed to live in close proximity. Another major difficulty is that neighbourhoods measured in available data are often considerably larger than those which matter for outcomes (i.e. close neighbours). Several institutional features of France enable us to address these problems. We find that an adolescent's outcomes at the end of junior high-school are strongly influenced by the performance of other adolescents in the neighbourhood