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First Author:
 
Jie Mao
School of Economics and Management, Tsinghua University
maoj@sem.tsinghua.edu.cn
 
Box E-22, School of Economics and Management, Tsinghua University
Beijing, 100084, P. R. China
 
 
 

Second Author:

Ben Li
Department of Economics, University of Colorado at Boulder
guanyi.li@colorado.edu
 
USA