1. Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, 2Department of Economics, University of Bonn, Bonn, 3Max Planck Institute for Neurological Research, Cologne, Germany, 4Department of Public Finance, University of Innsbruck, Innsbruck, Austria, 5Department of Economics, University of Gothenburg, Gothenburg, Sweden, and 6Department of Economics, Harvard University, Cambridge MA, USA