1. Department of Economics and Business, University of Cagliari, Cagliari, Italy
2. CRENoS, Sassari, Italy
3. Department of Economics and Business, University of Sassari, Sassari, Italy
4. Department of Social Sciences, Gran Sasso Science Institute, L’Aquila, Italy
5. LEM UMR CNRS 9221, University of Artois, Arras, France
6. LISA UMR CNRS 6240, University of Corsica, Corte, France