First Author:   Takeshi Ikeda Kobe International University ikeda@kobe-kiu.ac.jp   9-1-6, Koyocho-naka, Higashinada Kobe, 658-0032, Japan   078-845-3131(Phone) 078-845-3131(Fax) Second Author: Daisuke Nikae Osaka City University nikae04@econ.osaka-cu.ac.jp