First Author:   Koichi Miyazaki Faculty of Economics, Kagawa University kmiyazaki@ec.kagawa-u.ac.jp   2-1 Saiwai-cho Takamatsu-shi, Kagawa, 7608523, Japan   81-87-832-1851(Phone) 81-87-832-1851(Fax) Second Author: Hung-ju Chen Department of Economics, National Taiwan University hjc@ntu.edu.tw   No.1, Sec.4, Roosevelt Road Taipei, 10617, Taiwan   886-2-33668416(Phone) 886-2-23657975(Fax)