Date Added: Dec 2010
What has driven trade booms and trade busts in the past and present? The authors derive a micro-founded measure of trade frictions from leading trade theories and use it to gauge the importance of bilateral trade costs in determining international trade flows. The authors construct a new balanced sample of bilateral trade flows for 130 country pairs across the Americas, Asia, Europe, and Oceania for the period from 1870 to 2000 and demonstrate an overriding role for declining trade costs in the pre-World War I trade boom. In contrast, for the post-World War II trade booms the authors identify changes in output as the dominant force. Finally, the entirety of the interwar trade bust is explained by increases in trade costs.