1. IGIER, Department of Economics Bocconi University Milano Italy
2. École Polytechnique Fédérale de Lausanne Lausanne Switzerland
3. ZEW Mannheim Germany
4. GREEN‐Bocconi University of Rome Tor Vergata Rome Italy
5. University of Mannheim Mannheim Germany
6. School of Innovation Sciences Eindhoven University of Technology Eindhoven Netherlands
7. Stockholm School of Economics (SITE), EIEF University of Rome Tor Vergata Rome Italy