1. Department of Economics, Society and Politics, University of Urbino, Via A. Saffi n. 42, 61029 Urbino, Italy
2. Department of Economics, University of Molise, via F. De Sanctis 1, 86100 Campobasso, Italy
3. Department of Psychology, and Center for Logic, Language and Cognition, University of Torino, via G. Verdi 10, 10124 Torino, Italy