affiliation not provided to SSRN, University of Naples Federico II, University of Naples Federico II, University of Salerno, University of Salerno, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Politecnico di Torino, University of Naples Federico II, University of Naples Federico II, University of Naples Federico II, University of Naples Federico II, University of Naples Federico II and Politecnico di Torino