We use event-study models based on staggered summer vacations in Germany to estimate the effect of school re-openings after the summer of 2021 on the spread of SARS-CoV-2. Estimations are based on daily counts of confirmed coronavirus infections across all 401 German counties. Our results are...

Using a comprehensive administrative database we exploit independent quasi-experimental methods to estimate the effect of class size on student achievement in Norway. The first method is based on a maximum class size rule in the spirit Angrist and Lavy (1999). The second method exploits...

Class size reductions are popular with parents, teachers and politicians. In recent years various contributors to the public debate have increasingly expressed the opinion that class size does not matter. For example, the popular science author Gladwell (2013) uses class size reduction as an...

Using a comprehensive administrative database we exploit independent quasi-experimental methods to estimate the effect of class size on student achievement in Norway. The first method is based on a maximum class size rule in the spirit Angrist and Lavy (1999). The second method exploits...

This paper studies the effects of enrollment in an elite school on students' achievement. We use that elite schools in Amsterdam are often oversubscribed and admission is based on lotteries. Our results show that elite schools have negative effects on achievement of students who just qualify for...