Affiliation: | aFaculty of Economics, Keio University, Mita Toho Bldg. 3rd Floor, 3-1-7 Mita, Minato-ku, Tokyo, 108-0073, Japan;bFaculty of Economics, Keio University, 2-15-45 Mita, Minato-ku, Tokyo, 108-8345, Japan;cDepartment of Economics, Kanazawa Seiryo University, Ushi 10-1, Gosho-machi, Kanazawa-shi, Ishikawa, 920-8620, Japan |