1. Department of Management, University of Bologna, via Capo di Lucca 34, I-40126 Bologna, Italy
2. Department of Economics and Statistics ‘Cognetti De Martiis’, University of Turin, via Lungo Dora Siena 100, A, I-10153 Turin, Italy.
3. CRIOS, Bocconi University, via Guglielmo Roentgen 1, I-20136 Milan, Italy