Tap Water Access in Early Childhood and Long-Term Educational Performance
利用台湾1978-80年数据，以家庭到最近自来水站的距离为工具变量，发现幼儿期获得自来水显著提高大学录取概率。
We study the effect of access to tap water in early childhood on children’s university admission using data from Taiwan in the years 1978–80. Because access to tap water is managed by a water operation station in a household’s county, our identification strategy relies on two geographic attributes: (i) our instrumental variable is the distance from the house to the nearest water operation station, and (ii) our sample is of children born to families that live on the border of a county. We find that access to tap water in early childhood significantly increases the probability of university admission.