Immigrants during two global centuries : rising quantity and falling quality -- A framework -- Looking at local labor markets -- Immigration shocks and labor market absorption : two modern examples -- Immigrants, wages, and inequality : the global centuries compared -- Policy and the demise of...

"Human capital-based theories of cities suggest that large, economically diverse urban agglomerations increase worker productivity by increasing the rate at which individuals acquire skills. One largely unexplored implication of this theory is that workers in big cities should see faster growth...