Is the variation in bilateral trade flows across countries primarily due to differences in the number of exporting firms (the extensive margin) or in the average size of an exporter (the intensive margin)? And how does this affect the estimation and quantitative implications of the Melitz (2003)...

In 1960, South Korea's exports were about 1 percent of GDP, and its ability to import depended almost entirely on U.S. aid. After changing its foreign exchange policies in the mid-1960s, Korea's exports surged to more than 10 percent of GDP by the end of the decade. This paper explores the...