The authors thank the editor, three anonymous referees, Adrian Bruhin, Helga Fehr-Duda, Urs Fischbacher, Thomas Fischer, Simon Gächter, Holger Herz, Matthias Krapf, Luís Santos-Pinto, Peter Wakker, Roberto Weber, and Christian Zehnder for helpful comments and suggestions. The authors also thank Lukas Haffert and Christoph Schleiffer for excellent research assistance.
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