[1] Univ Turin, Dipartimento Econ S Cognetti de Martiis, BRICK Bur Econ Res Innovat Complex & Knowledge, Coll Carlo Alberto, I-10124 Turin, Italy
[2] Politecn Milan, DIG, Dipartimento Ingn Gestionale, I-20133 Milan, Italy
[3] Grenoble Ecole Management, F-38003 Grenoble 01, France