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 …

document the first empirical results on the relationship between imports and productivity for Germany, a leading actor on the … systematically by testing for self-selection of more productive firms into importing, and for productivity-enhancing effects of … imports ("learning-by-importing"). We find a positive link between importing and productivity. From an empirical model with …

performance indicators, productivity and profitability. -- One -third co-determination ; firm performance ; Germany …

and productivity hold in the years before the export start, which indicates self-selection into exporting of more …

productive than firms that only sell on the national market. This positive exporter productivity premium shows up in a large … firm fixed effects. These studies test for a difference in productivity between exporters and non-exporters at the … conditional mean of the productivity distribution. However, if firms are heterogeneous, it is possible that the size of the …

. -- Robust estimation ; panel data ; outliers ; Stata ; exporter productivity premium …