Affiliation: | a Berlin University of Technology, Chair of Innovation Economics, Sekr. VWS2, Müller-Breslau-Straße, D-10623 Berlin, Germany b Fraunhofer Institute for Open Communication Systems FOKUS, Berlin, Germany c Erasmus Research Institute of Management, Rotterdam School of Management, The Netherlands d European Patent Office, Chief Economist, Erhardtstr. 27, D-80469 München, Germany |