First Author:   Wataru KUREISHI Graduate School of Economics, Osaka University kureishi@iser.osaka-u.ac.jp   5-36-24, Higashitoyonaka Toyonaka, 5600003, Japan   +81-6-6850-9933(Phone) +81-6-6850-9933(Fax) Second Author: Hideki MIZUKAMI Faculty of Economics, University of Toyama mizukami@eco.toyama-u.ac.jp