Despite the prevalence of school tracking, evidence on whether it improves student success is mixed. This paper studies how tracking within high school impacts high-achieving students' short- and longer-term academic outcomes. Our setting is a large and selective Chinese high school, where...

Mental health problems among the elderly have attracted increasing attention. The most serious mental health problems may result in suicide, and lack of family companionship is often speculated to be a major cause. In this paper, we use high-frequency suicide rate data and utilize a novel...

We provide the first study estimating the causal effect of air pollution on body weight. Using the China Health and Nutrition Survey, which provides detailed longitudinal health and socioeconomic information for 13,226 adult individuals over 1989-2011, we find significant positive effects of air...