First Author:   Shigeyuki Hamori Kobe University hamori@econ.kobe-u.ac.jp         Second Author: Takeshi Hoshikawa Kinki University hoshikawa@kindai.ac.jp         Third Author: Junya Masuda Mitsubishi Research Institute junya.masuda@gmail.com         Fourth Author: Kunihiro Hanabusa Kobe University 048d203e@stu.kobe-u.ac.jp