First Author:   Wei-Hsiung Wu Department of Finance, Ming Chuan University wuwh@mcu.edu.tw   Taipei, Taiwan       Second Author: Hui-Hwang Tsai Graduate School of Department of Finance, National Taiwan University huihwang@ms24.hinet.net   Taipei, Taiwan       Third Author: Shyan-Yuan Lee Department of Finance, National Taiwan University shyanlee@ccms.ntu.edu.tw   Taipei, Taiwan       Fourth Author: Son-Nan Chen Department of Banking and Finance, National Chengchi University slchen@nccu.edu.tw   Taipei, Taiwan