1. Institute for Evaluation of Labour Market and Education Policy (IFAU) Uppsala Sweden
2. UCFS, UCLS Uppsala Sweden
3. Research Institute of Industrial Economics (IFN) Stockholm Sweden
4. Department of Economics University of Illinois at Urbana‐Champaign Champaign Illinois USA
5. Department of Law University of Milan Milan Italy
6. Dondena Centre for Research on Social Dynamics and Public Policy Bocconi University Milan Italy