[1] INSEAD, Ctr Management Environm Resources, F-77305 Fontainebleau, France
[2] Chalmers Inst, Dept Phys Resource Theory, Gothenburg, Sweden
[3] Free Univ Amsterdam, Dept Spatial Econ, Fac Econ & Business Adm, NL-1105 HV Amsterdam, Netherlands
[4] Free Univ Amsterdam, Inst Environm Studies, NL-1105 HV Amsterdam, Netherlands