Sandra Black, Sanni Breining, David Figlio, Jonathan Guryan, Krzysztof Karbownik, Helena Skyt Nielsen, Jeffrey Roth, Marianne Simonsen, 08 July 2017

Despite the policy importance of understanding the relationships between them, very little evidence exists on the causal effects siblings have on one another. This column investigates outcomes for families in which the third-born child has a disability, and shows that the oldest children have better educational outcomes than the middle children, who due to birth order are more likely to be more affected by a common sibling spillover. We may be able to measure greater returns to investments that relieve the effects of negative shocks to children if we consider the effects on siblings too.

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