A continuum of ages exists at school entry due to the use of a single school cutoff date-making the "oldest" children approximately 20 percent older than the "youngest" children. We provide substantial evidence that these initial maturity differences have long-lasting effects on student...

Many studies examine the importance of teachers in students' learning, but few exist on the contribution of principals. We measure the effect of principals on gains in primary test scores in North Carolina and estimate the standard deviation of principals' value added to be 0.12 -0.17. We find...

We examine the impact of offering full-day as a replacement for half-day kindergarten on mothers' labour supply using the rollout of full-day kindergarten in Ontario, Canada. We find no impact on the extensive margin but do find one on the intensive margin. In particular, we find that access to...