[1] Univ Geneva, Sch Social Sci SdS, Dept Hist Econ & Soc DEHES, Geneva, Switzerland
[2] London Sch Econ, SERC, London, England
[3] Bocconi Univ, Res Ctr Reg Econ Transports & Tourism CERTeT, Milan, Italy
[4] Bocconi Univ, Dept Policy Anal & Publ Management, Milan, Italy