We leverage the timing of coalmine accidents to examine the effect of coal mining on air pollution. Safety regulations mandate that coal mining be suspended if a mine experiences an accident with 10 or more fatalities. We use a stacked difference-in-differences approach to compare counties with...

As an important employment supportive policy, the impact of universal and subsidized child care on the mothers and children has aroused extensive concern in the research community. However, little is known about how grandmothers respond to easier accessibility to public child care. This paper...