First Author:   Botao Qin Xi'an Jiaotong University bqinecon@mail.xjtu.edu.cn   No. 28 West Xianning Road, Xi''an Jiaotong University, Jinhe Center for Economic Research Xi''an, 710049, China   86-29-82665022(Phone) 86-29-82665022(Fax) Second Author: Thorsten Janus University of Wyoming tjanus@uwyo.edu   1000 E. University Ave., Department of Economics, University of Wyoming Laramie, 82071, U.S.A