First Author:   Shigeyuki Hamori Kobe University hamori@econ.kobe-u.ac.jp   2-1, Rokkodai, Nada-Ku Kobe, 657-8501, Japan       Second Author: Yu-Ching Hsieh Kobe University yqxie1996@yahoo.co.jp   2-1, Rokkodai, Nada-Ku Kobe, 657-8501, Japan       Third Author: Wan-Jun Yao Nankai University yaowanjun0475@yahoo.co.jp   94 Weijin Road Tianjin City, 300071, China