Before revision: Countries differ in the diversification of their exports and products differ in the number of countries that export them -their ubiquity.We document a new stylized fact in the global pattern of exports: a relationship between the diversification of a country 's exports and the ubiquity of its products.
After revision: Much of the analysis of economic growth has focused on the study of aggregate output. Here, we deviate from this tradition and look instead at the structure of output embodied in the network connecting countries to the products that they export.We characterize this network using four structural features: the negative relationship between the diversification of a country 's exports and the ubiquity of its products.