1. University of Rome “Tor Vergata” Department of Economics and Finance, , Via Columbia 2, 00133 Rome, Italy, nicola.amendola@uniroma2.it
2. Sant’Anna School of Advanced Studies Institute of Economics, , Piazza Martiri della Libertà 33, 56127, Pisa, Italy, giacomo.gabbuti@santannapisa.it
3. University of Rome “Tor Vergata” Department of Economics and Finance, , Via Columbia 2, 00133 Rome, Italy, giovanni.vecchi@uniroma2.it