university. By exploiting data with repeated random assignment of students to teaching sections, we find that a higher rank …: improvements in rank raise performance, while decreases in rank have no effect. Rank effects partially operate through students …

This paper estimates the marginal effect of class size on educational attainment of high school students. We control …

Objective: To estimate the causal effect of breastfeeding on children's cognitive skills as measured at ages 3, 5, 7 …). Participants: Data on 11,792 (age 3) and 9117 (age 5) children in MCS and 4923 (age 7 and 11) children in NCDS. Main outcome …: The duration of breastfeeding has a small, but significant, effect on children's cognitive skills in the linear regression …

substantial and heterogeneous employment responses that increased average income despite reduced transfers. We find zero effects …