This paper develops a model of firm heterogeneity, technological adoption, and urbanization. In the model, welfare is measured by household real income, and urbanization is measured by population density. I use the model to derive statistics that measure the effect of a new technology on...

Immigrants can increase international trade by shifting preferences towards the goods of their country of origin and by reducing bilateral transaction costs. Using geographical variation across U.S. states for the period 2008 to 2013, I estimate the respective causal impact of immigrants on U.S....

We argue that the interaction between mobility and wealth provides a view that rationalizes low geographic migration rates, despite migration costs being lower than currently thought. We reach this conclusion by developing and solving a quantitative dynamic spatial equilibrium model with...

This paper studies the role that market structure plays in affecting the diffusion of electronic banking. Electronic banking (and electronic commerce more generally) reduces the cost of performing many types of transactions for firms. The full benefits for firms from adoption, however, only...