1. Department of Business Economics & Public Policy, The Wharton School; University of Pennsylvania; Philadelphia PA USA
2. University of Applied Sciences; Faculty of Business and Economics; Blechhammer 9 D-98574 Schmalkalden Germany
3. ZEW Centre for European Economic Research; Mannheim Germany
4. Télécom ParisTech; Département Sciences Sociales et Économiques; 46 Rue Barrault 75013 Paris France