João R. Ferreira
London School of Economics and Political Science
Wayne Aaron Sandholtz
Nova School of Business and Economics, CESifo, and IZA, and NOVAFRICA
ISSN 2183-0843
Working Paper No 2506
December 2025
Abstract:
We use administrative data to measure sibling spillovers on academic performance before and after the introduction of Free Secondary Education (FSE) in Tanzania. Prior to FSE, students whose older siblings narrowly passed the secondary school entrance exam were less likely to go to secondary school themselves; with FSE, the effect became positive. A triple-differences analysis, using geographic variation in FSE exposure, shows that FSE caused the reversal. Mechanism analyses suggest that changes in parental investments were a more likely channel for this reversal than direct sibling interactions. By alleviating financial constraints, FSE allowed households to distribute educational investments more equitably rather than concentrating resources on high-performing children.
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