[1] Univ Milano Bicocca, Dept Econ Management & Stat, Piazza Ateneo Nuovo 1, I-20126 Milan, Italy
[2] Univ Strasbourg, Bur Econ Theor & Appliquee BETA, 61 Ave Foret Noire, F-67085 Strasbourg, France
[3] Univ Venice CaFoscari, Dept Management, Dorsoduro 3246, I-30123 Venice, Italy
[4] Scuola Super Sant Anna, Inst Econ, Piazza Martiri Liberta 33, I-56127 Pisa, Italy