Airplanes are a fast but expensive means of shipping goods, a fact which has implications for comparative advantage. The paper develops a Ricardian model with a continuum of goods which vary by weight and hence transport cost. Comparative advantage depends on relative air and surface transport...

The core subjects of trade theory are the pattern and volume of trade: which goods are traded by which countries, and how much of those goods are traded. The first part of the paper discusses evidence on comparative advantage, with an emphasis on carefully connecting theory models to data...

In the last quarter century, wage inequality has increased dramatically in the United States. At the same time, the US has become more integrated into the world economy prices of final goods have changed, the capital stock has more than doubled has become steadily more educated. This paper...

Many economists and policy makers are concerned about international differences in technology and labor quality, correctly seeing these issues as crucial to long term growth in living standards. Typically, international trade economists assume that technological knowledge is the same in all...

The standard neoclassical model of trade theory predicts that international specialization will be jointly determined by cross-country differences in relative factor endowments and relative technology levels. This paper uses duality theory combined with a flexible functional form to specify an...

[...]In this article, we consider what these risks, and the publicperception of them, mean for cities in general and for thefuture of New York City in particular. We begin by examiningthe question of why cities exist at all. Only by answering thisimportant question can we think more clearly...

This paper surveys the empirical literature on the economic geography of trade flows, factor prices, and the location of production. The discussion is structured around the empirical predictions of a canonical theoretical model. We review empirical evidence on the determinants of trade costs and...