[1] Univ Barcelona, Dept Publ Econ, E-08007 Barcelona, Spain
[2] Univ Barcelona, Energy Sustainabil, E-08007 Barcelona, Spain
[3] Univ Barcelona, Barcelona Inst Econ IEB, E-08007 Barcelona, Spain
[4] Univ Warwick, Coventry CV4 7AL, W Midlands, England