1. Centre of Decision Research and Experimental Economics, School of Economics, University of Nottingham, Sir Clive Granger Building, University Park, Nottingham NG7 2RD, UK
2. Center for Economic Studies and Ifo Institute for Economic Research, Institute for the Study of Labor, Munich DE-81679, Germany
3. University of St Gallen, SEW-HSG, Varnbuelstrasse 14, CH-9000 St Gallen, Switzerland