| Summary: | A two-year randomized evaluation shows that the effectiveness of mobile mentors on schooling outcomes crucially depends on their training. While a standard training modality in highly marginalized communities in Mexico generates 0 results, enhanced training yields sizable treatment effects on primary school children's cognitive, behavioral, and educational achievements. This difference cannot be explained by re medial educational activities or pedagogical support, but it can be reconciled with higher parental aspirations and investments. Evidence gathered on the subsequent national roll out of the intervention with enhanced training substantiates the scalability of the experimental design
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