1. Institute for Advanced Research, Shanghai University of Finance and Economics, Shanghai 200433, China
2. Key Laboratory of Mathematical Economics (SUFE), Ministry of Education, Shanghai 200433, China
3. Economics Experimental Laboratory, Nanjing Audit University, Nanjing 210017, China
4. Gies Business Department, University of Illinois Urbana-Champaign, Champaign, IL 61820, USA
5. Department of Economics and Computer Science, Lafayette College, Easton, PA 18042, USA
6. School of Economics, Renmin University of China, Beijing 100872, China