A significant body of research demonstrates that teachers and the quality of their teaching are crucial components of student learning. Many teachers in resource-poor environments have limited knowledge, skills, or motivation. Some impact evaluations have shown promising results from...

Private sector unionism is in decline in the United States. As a result, labor advocates, community groups, nongovernmental organizations, and individuals concerned with the well-being of workers have sought to develop alternative ways to represent workers' interests. Emerging Labor Market...

In this lecture I first give an explanation for invidious preferences based on the (evolutionary) competition for resources. Then I show that these preferences have wide ranging and empirically relevant effects on labor markets, such as: workplace skill segregation, gradual promotions, wage...