First Author:   Luca Pedini Department of Economics and Social Sciences (Università Politecnica delle Marche) l.pedini@univpm.it   Ancona, Italy       Second Author: Chiara Casoli Fondazione Eni Enrico Mattei chiara.casoli@feem.it   Milan, Italy       Third Author: Francesco Valentini Department of Economics and Social Sciences (Università Politecnica delle Marche) f.valentini@univpm.it   Ancona, Italy