What makes diversity unifying in some settings but divisive in others? We examine how the mixing of ethnic groups in German schools affects intergroup cooperation and trust. We leverage the quasi-random assignment of students to classrooms within schools to obtain variation in the type of...

We study the impact on learning of a child's rank in the classroom using a unique experiment from Ecuador. Within each school, students were randomly assigned to classrooms in every grade between kindergarten and 6th grade.Therefore, two students with the same ability can have different...

Corruption remains a major challenge to sustainable economic growth, good governance, peace, and stability in both developed and developing countries. However, in developing countries, and particularly in Africa, hunger is another big challenge to inclusive economic development. To date, no...