First Author:   Nobuyuki Ito Division of Natural Resource Economics, Graduate School of Agriculture, Kyoto Univerisy nobuyuki.itoh@gmail.com   Oiwake-cho, Kitashirakawa, Sakyo-ku Kyoto, 606-8502, Japan   +81-75-753-6198(Phone) +81-75-753-6198(Fax) Second Author: Kenji Takeuchi Graduate School of Economics, Kobe University takeuchi@econ.kobe-u.ac.jp         Third Author: Takahiro Tsuge Faculty of Economics, Konan University tsuge@center.konan-u.ac.jp         Fourth Author: Atsuo Kishimoto National Institute of Advanced Industrial Science and Technology kishimoto-atsuo@aist.go.jp