Caterina Francesca Guidi, Paolo Brunori, Alain Trannoy, Dipartimento di Scienze per l'Economia e l'Impresa, University of Florence, Florence, Italy, Polytechnic University of Bari, Aix-Marseille Sciences Economiques (AMSE), École des hautes études en sciences sociales (EHESS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), University of Siena, Italy, This paper benefits from the support of the Norface project IMCHILD., Università degli Studi di Firenze = University of Florence (UniFI), and Università degli Studi di Siena = University of Siena (UNISI)