How do exporters expand their product scope and geographical presence? We argue that new exporters are uncertain about their profitability in different countries and products, but learn it as they start to export. As a consequence, exporters add products and countries sequentially, in an...

In this paper, we provide new explanations for the puzzling findings in the literature that migrants do not decrease natives' wages, and that skilled immigration can actually increase them. We develop a model with regional labor markets and heterogeneous firms in which workers of different skill...