First Author:   Kam-Ki Tang School of Economics, University of Queensland kk.tang@economics.uq.edu.au   School of Economics, University of Queensland Brisbane, 4072, Australia   61-7-3365 9796(Phone) 61-7-3365 9796(Fax) Second Author: Yi-Ping Tseng Melbourne Institute of Applied Economic and Social Research, University of Melbourne y.tseng@unimelb.edu.au   Melbourne Institute of Applied Economic and Social Research, University of Melbourne Melbourne, 3010, Australia   61-3-8344 7484(Phone) 61-3-8344 5630(Fax)