[1] Univ Aquila, Dept Ind & Informat Engn & Econ, Laquila, Italy
[2] Univ Bari Aldo Moro, Dept Polit Sci, Bari, Italy
[3] UCL, Inst Innovat & Publ Purpose, London, England
[4] Univ Salerno, Dept Econ & Stat, Fisciano, Italy
[5] Univ Salerno, Ctr Econ & Labour Policy Evaluat CELPE, Fisciano, Italy
[6] Inst Int Polit Econ IPE, Berlin, Germany