1. Department of Economics, Business and Statistics (SEAS), University of Palermo, Viale delle Scienze, 90128 Palermo, Italy
2. Faculty of Economics, University of Coimbra, Av Dias da Silva, 165, 3004-512 Coimbra, Portugal; Economic Policies Research Unit (NIPE), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
3. Department of Economics and Economic Policies Research Unit (NIPE), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; and LSE Alumni Association, London School of Economics, Houghton Street, London WC2 2AE, United Kingdom;