firms always have a higher market share, there is no monotonic relationship between firms' productivity level and their … effect". Therefore, the incentive to add more products weakens as productivity rises. This leads to Lemma 3 in Feenstra and … evidence is in line with the results from the theoretical model. -- multi-product firms ; productivity ; optimal product scope …

manufacturing firms. First, there is a negative correlation between firms' productivity and their export share to low … found between the share of exports to lowincome countries and either productivity or R&D intensity is never in line with the …

-exporters. However, many firms from the lower end of the productivity distribution are exporters. Germany is a case in point. A recent … study reports that these low-productivity exporters are not marginal exporters defined according to the share of exports in … exports is much higher among exporters from the lower end of the productivity distribution than among highly productive …