1. Roskilde University Department of Social Sciences and Business, Universitetsvej 1, 4000 Roskilde, Denmark
2. University of Copenhagen, Department of Food and Resource Economics, Rolighedsvej 25, 1958 Frederiksberg C, Denmark
3. University of California, Berkeley, Garwood Center for Corporate Innovation, F402 Haas School of Business, #1930, Berkeley, CA 94720-1930, USA