New Evidence of the Causal Effect of Family Size on Child Quality in a Developing Country
利用巴西1991年人口普查数据，以双胞胎作为工具变量，发现家庭规模扩大会增加儿童劳动参与、减少教育投入，尤其对贫困家庭影响更大。
This paper presents new evidence of the causal effect of family size on child quality in a developing-country context. We estimate the impact of family size on child labor and educational outcomes among Brazilian children and young adults by exploring the exogenous variation of family size driven by the presence of twins in the family. Using the Brazilian Census data for 1991, we nd that the exogenous increase in family size is positively related to labor force participation for boys and girls and to household chores for young women. We also and negative e ects on educational outcomes for boys and girls and negative impacts on human capital formation for young female adults. Moreover, we obtain suggestive evidence that credit and time constraints faced by poor families may explain the findings.