1. Institute of Microeconomics, European University Viadrina, 15230 Frankfurt (Oder), Germany (e-mail: )
2. Nottingham University Business School, University of Nottingham, Nottingham NG8 1BB, UK (e-mail: )
3. School of Economics and CBESS, University of East Anglia, Norwich NR4 7TJ, UK (e-mail: )