Affiliation: | 1. The University of Tokyo, Institute of Social Science, 7‐3‐1, Hongo, Bunkyo‐ku, Tokyo, 113‐0033, Japan (e‐mail: matsumur@iss.u‐tokyo.ac.jp);2. Gakushuin University, Faculty of Economics, 1‐5‐1 Mejiro, Toshimaku, Tokyo, 171‐8588, Japan (Corresponding author e‐mail: daisuke.shimizu@gakushuin.ac.jp) |