1. Department of Economics, University of Oslo, Blindern, Oslo, Norway.
2. Statistics Norway, St. Hanshaugen, Oslo, Norway.
3. CICERO, Gaustadalléen 21, Oslo, Norway.
4. Oslo Business School, Oslo Metropolitan University, St. Olavs plass, Oslo, Norway.
5. Ragnar Frisch Centre for economic research, Gaustadalléen 21, Oslo, Norway.
6. TSE, Toulouse, France.
7. School of Economics and Business, Norwegian University of Life Sciences, Ås, Norway.