Multi-Product Exporters : Diversification and Micro-Level Dynamics

Recent developments in trade theory, especially research on multi-product firms, have not been matched by similar progress on the empirical front. This paper aims to fill this gap by presenting a novel set of stylized facts on firm-product dynamics observed during an export boom. This exercise is possible thanks to a unique firm-product level dataset covering about 85 percent of Mexican industrial output for the period 1994-2003. The main findings are as follows. First, there is a substantial degree of product turnover at the firm-product level in response to declining trade costs. Second,quot;core competenciesquot; - the fact that firms have a cost advantage or greater expertise at manufacturing some of their products - are the main driver of firms' decision to introduce or drop export products. Third, new exporters tend to quot;start smallquot; in terms of both values and number of exported products. Fourth, even if the expansion in the number of exported products played a role in stimulating Mexican exports, the growth in volume of pre-existing products was the main driver of the export boom. Finally, the introduction of new export products is preceded by a surge in investment. These findings are in line with many, but not all, predictions of recent theoretical work