This paper argues that the theoretical foundations for the gravity equation are general, while the empirical performance of the gravity equation is specific to the type of goods examined. Most existing theory for the gravity equation depends on the assumption of differentiated goods. We show...

We develop a procedure to rank-order countries and commodities using dis-aggregated American imports data. We find strong evidence that both countries and commodities can be ranked, consistent with the product cycle' hypothesis. Countries habitually begin to export goods to the United States...

Once unquestionably the world's leading economic and industrial power, the United States now views with growing dismay the impressive industrial efficiency, vigorous work ethics, and large American holdings of various other nations. Is the United States truly lagging in its ability to compete...