"Feenstra and Kee study the link between export product variety and country productivity based on data from 34 … productivity gains. In addition, as suggested in the literature, export product variety depends on trade costs, such as tariffs … export variety on country productivity. Empirical evidence supports their hypothesis. Overall, while export variety accounts …

is particularly appealing given its consistency with micro-level findings on firm sizes and export behavior. We broaden … entry leading to important variety effects. We also find important productivity effects related to the competitive selection …