1. Postdoctoral Researcher, Department of Economics and Management, Faculty of Agriculture and Forestry, University of Helsinki, P.O. Box 27, Latokartanonkaari 5, 00014, Helsinki, Finland.
2. Professor, Department of Economics and Management, Faculty of Agriculture and Forestry, University of Helsinki, P.O. Box 27, Latokartanonkaari 5, 00014, Helsinki, Finland.