First Author:   Yang-Ming Chang Kansas State University ymchang@ksu.edu   Department of Economics, Kansas State University Manhattan, 66506-4001, U.S.A.   (785)532-4573(Phone) (785)532-4573(Fax) http://www.k-state.edu/economics/staff/bios/chang.html Second Author: Hung-Yi Chen Soochow University hychen@scu.edu.tw   Soochow University, Soochow University Taipei, Taiwan