1. University of Bari Aldo Moro, Via Duomo 259, 74123 Taranto, Italy
2. University of Salento, Ecotekne Campus, Via per Monteroni, 73100 Lecce, Italy
3. Stephen M. Ross School of Business, University of Michigan, 701 Tappan St., Ann Arbor, MI 48109-1234, USA