1. Institute for Environmental Studies (IVM), Vrije Universiteit Amsterdam, Amsterdam, Netherlands
2. Centre of Economic Research (CER-ETH), ETH Zürich, Zurich, Switzerland
3. Università della Svizzera italiana, Lugano, Switzerland
4. Department of Forest Economics, and Centre for Environmental and Resource Economics (CERE), Swedish University of Agricultural Sciences (SLU), Umeå, Sweden