First Author:   Thai-Ha Le Nanyang Technological University, Singapore thai1@e.ntu.edu.sg   Jurong West Street 91, Block 945-5-509 Singapore, 640945, Singapore   +65-82269879(Phone) +65-82269879(Fax) http://econ.hss.ntu.edu.sg/Pages/Home.aspx Second Author: Youngho Chang Nanyang Technological University, Singapore isyhchang@ntu.edu.sg   School of Humanities and Social Sciences, School of Humanities and Social Sciences, Nanyang Technological University Singapore, 639798, Singapore   +65-65138107(Phone) 6795 5797(Fax) http://www.hssapps.ntu.edu.sg/faculty/econ.asp?u=isyhchang