The authors systematically document remarkably high degrees of concentration in manufacturing exports for a sample of 151 countries over a range of 3,000 products. For every country manufacturing exports are dominated by a few"big hits"which account for most of the export value and where...

We establish the following stylized facts: (1) Exports are characterized by Big Hits, (2) the Big Hits change from one period to the next, and (3) these changes are not explained by global factors like global commodity prices. These conclusions are robust to excluding extractable products (oil...

the direction of technological change over the last 40 years.

capital flows.

Online appendix for the Review of Economic Dynamics article

We study the rise of finance across a set of now-industrial economies. The long-run pattern of the growth of the income share of finance from the nineteenth century to current times in the United States is similar to some economies, but not all economies reach the same size and instead reach a...

We propose a theory that rising globalization and rising wage inequality are related because trade liberalization raises the demand facing highly competitive skill-intensive firms. In our model, only the lowest-cost firms participate in the global economy exactly along the lines of Melitz...

We use detailed information about wages, education and occupations to shed light on the evolution of the U.S. financial sector over the past century. We uncover a set of new, interrelated stylized facts: financial jobs were relatively skill intensive, complex, and highly paid until the 1930s and...