First Author:   Been-lon Chen Academia Sinica bchen@econ.sinica.edu.tw   128 Academia Rd Sec 2 Taipei, 11529, TAIWAN   886-2-27822791 ext 309(Phone) 886-2-27822791 ext 309(Fax) http://www.econ.sinica.edu.tw/faculty/researcher/beenlon.htm Second Author: Yu-shan Hsu National Chung Cheng University yushanshie@gmail.com   Min-Hsiung, 102, TAIWAN   886-5-2720411 ext. 34127(Phone) 886-5-2720816(Fax)