1. Department of Economics and CentER, Tilburg University, 5037 AB Tilburg, Netherlands
2. Department of Economics, University of Arizona, Tucson, Arizona 85721
3. Center for Research in Experimental Economics and Political Decision Making (CREED) and Tinbergen Institute, University of Amsterdam, 1082 MS Amsterdam, Netherlands
4. Center for Research in Experimental Economics and Political Decision Making (CREED) and Tinbergen Institute, University of Amsterdam, 1082 MS Amsterdam, Netherlands; and Program for Evolutionary Dynamics, Harvard University, Cambridge, Massachusetts 02138
5. Amsterdam School of Economics, University of Amsterdam, 1018 WB Amsterdam, Netherlands; and Tinbergen Institute, University of Amsterdam, 1082 MS Amsterdam, Netherlands