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 …

investigated with productivity levels as a proxy for technological performance and productivity changes as proxy for innovative …

Positive assortative matching implies that high productivity workers and firms match together. However, there is almost …. This could be the result of a bias caused by standard estimation error. Using German social security records we show that … the effect of this bias is substantial in samples with limited inter-firm movement. The correlation between worker and …

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 Ma …

We consider two semiparametric models for the weight function in a bias sample model. The object of our interest …