1. Department of External Environment for Agriculture and Policy Analysis, Leibniz Institute of Agricultural Development in Transition Economies (IAMO), Halle (Saale), Germany
2. Kurgan State Agricultural Academy, Ketovo District, Kurgan Region, Russia
3. Department of Economics, Swedish University of Agricultural Sciences, Uppsala, Sweden
4. Department of Agricultural Economics, Christian-Albrechts-University zu Kiel, Kiel, Germany