Sibling Differences in Genetic Propensity for Education: How Do Parents React?
利用基于DNA的遗传指数作为教育禀赋的代理变量，研究发现非双胞胎家庭中父母表现出不平等厌恶，即当兄弟姐妹遗传倾向较低时，对另一个孩子的投资减少；但在异卵双胞胎家庭中未发现类似反应。
Abstract We take advantage of recent advances in genomics to revisit a classic question in economics: how do parents respond to children’s endowments and to sibling differences in endowments? We use an index based on DNA, which is fixed at conception and assigned randomly across siblings, as a proxy for educational endowments. We find that parents of nontwins display inequality aversion: given the absolute endowment level of one child, they invest less in him/her if his/her sibling has a lower genetic predisposition to education. In contrast, we find no evidence that parents of dizygotic twins react to endowment differences between children.