First Author:   Yohei Tenryu Graduate School of Economics, Kyoto University tenryu.yohei.25s@st.kyoto-u.ac.jp   Yoshida Honmachi, Sakyo-Ku Kyoto, 606-8501, Japan       Second Author: Keita Kamei Graduate School of Economics, Kyoto University keita.kamei@gmail.com   , Japan   08018015237(Phone)