1. School of Economics, Shanghai University of Finance and Economics, 200433 Shanghai, China
2. Center for Research in Experimental Economics and Political Decision Making, University of Amsterdam, 1001 NJ Amsterdam, Netherlands; and Tinbergen Institute, 1082 MS Amsterdam, Netherlands
3. Amsterdam Center for Law and Economics, University of Amsterdam, 1001 NJ Amsterdam, Netherlands; and Tinbergen Institute, 1082 MS Amsterdam, Netherlands