This paper reviews the recent literature on rural-urban migration in developing countries,
focusing on three key questions: What motivates or forces people to migrate? What costs do …

The frictions that restrict migration are among the largest sources of inefficiency in the global
economy. The first step in designing policies to address these frictions is to understand the …

I estimate the effects of collaborative and adversarial intergroup contact. I randomly
assigned Indian men from different castes to participate in cricket leagues or to serve as a …

Can external threats strengthen group identity? A growing body of research in economics
emphasises the importance of cultural attributes such as identity for trust and cooperation …

We evaluate the effect of an educational program that aims to build social cohesion in
ethnically mixed schools by developing perspective-taking ability in children. The program is …

We examine whether shared collective experiences help build a national identity, by looking
at the impact of national football teams' victories in sub-Saharan Africa. We find that …

We review the growing literature on the political economy of immigration. First, we discuss
the effects of immigration on a wide range of political and social outcomes. The existing …

We study how decades-long exposure to individuals of a given foreign descent shapes
natives' attitudes and behavior toward that group. Using individualized donations data, we …

“Why We Fight reflects Blattman's expertise in economics, political science, and history…
Blattman is a great storyteller, with important insights for us all.”—Richard H. Thaler, winner …

How does the arrival of a new minority group affect the social acceptance and outcomes of
existing minorities? We study this question in the context of the First Great Migration …