1. The Norwegian Institute of Bioeconomy Research (NIBIO), Department of Economics and Society , Raveien 9, 1430 Ås , Norway
2. The Norwegian Institute of Food, Fisheries and Aquaculture Research (NOFIMA) , Muninbakken 9, 9019 Tromsø , Norway
3. SNF- Centre for Applied Research at The Norwegian School of Economics (NHH) , Helleveien 30, N-5045, Bergen , Norway