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