1. Economic Modeling and Policy Analysis Group, Agroscope Ettenhausen Switzerland
2. Department of Agricultural Economics Purdue University Indiana USA
3. Department of Environmental Science and Policy University of Milan Milano Italy
4. United Nations Conference on Trade and Development Geneva Switzerland
5. Department of Agricultural Economics and Rural Development University of Goettingen Goettingen Germany
6. Centre for Biodiversity and Sustainable Land Use (CBL) University of Goettingen Goettingen Germany