1. Department of Economics, Hanken School of Economics, PO Box 479, FI-00101 Helsinki, Finland and University of Jyväskylä (email: )
2. Department of Economics, Norwegian School of Economics, 5045 Bergen, Norway and CEPR (email: )
3. Department of Economics, Aalto University School of Business, PO Box 21240, FI-0076 AALTO, Finland, Helsinki Graduate School of Economics, KU Leuven, and CEPR (email: )