Abstract
A recent theoretical literature has emphasized the importance of multiproduct firms in trade. However, models within this literature have reached contradictory conclusions regarding the product-level response of firms to changes in trade costs. This paper attempts to resolve these contradictions by employing Bayesian techniques to estimate the product portfolio response throughout the distribution of U.S. firms following the Canada-US Free Trade Agreement of 1989. I find evidence of a differential response among firms that are heterogeneous in terms of their involvement in foreign markets. Firms with less than 10-20 percent of total sales accounted for by foreign markets reduced product diversification as trade costs fell, while more foreign-oriented firms increased diversification.
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