De Rassenfosse, Gaétan; Wastyn, Annelies - Zentrum für Europäische Wirtschaftsforschung (ZEW) - 2012
The study of the innovative output of firms often relies on a count of patents filed at one single office of reference such as the European Patent Office (EPO). Yet, not all firms file their patents at the EPO, raising the specter of a selection bias. Using a novel dataset of the whole...