Verardi, Vincenzo; Wagner, Joachim - 2010
estimates of the productivity premium of German firms exporting to the Euro-zone and beyond, controlling for unobserved time … invariant firm specific effects, and tests for self-selection of more productive firms into exporting beyond the Euro-zone. (3 … Euro-zone only is no longer much smaller that the premium of firms that export beyond the Euro-zone, too, and the premium …