Birth Order and Human Capital Development
研究厄瓜多尔家庭中出生顺序对儿童人力资本发展的影响，发现早出生的孩子从婴儿期到青春期发展滞后，原因包括母亲陪伴时间少和母乳喂养短，且贫困家庭效应更显著。
In this paper we examine the effect of birth order on human capital development in Ecuador. Using family fixed effects models we find positive and persistent birth order effects; earlier-born children stay behind in their human capital development from infancy to adolescence. Turning to potential mechanisms, we find that earlier-born children receive less quality time from their mothers. Additionally, they are breastfed shorter. Poverty plays a key role in explaining these birth order patterns; we observe the largest birth order effects in poor and low-educated families, accompanied with reversed birth order effects in rich and high-educated families.