1. Faculty of Business and Commerce Keio University 2-15-45 Mita, Minato-ku Tokyo 108-8345, Japan m-ando@fbc.keio.ac.jp
2. Research Institute of Economy, Trade and Industry (RIETI) and Waseda University 1-3-1 Kasumigaseki, Chiyoda-ku Tokyo 100-8901, Japan urata-shujiro@rieti.go.jp
3. Faculty of Economics Kagawa University 2-1 Saiwaicho, Takamatsu Kagawa 760-8523, Japan yamanouchi.kenta@kagawa-u.ac.jp