About the Authors

Tsutomu Watanabe

Roles Conceptualization, Investigation, Methodology, Project administration, Writing – original draft, Writing – review & editing

watanabe@e.u-tokyo.ac.jp

Affiliation Graduate School of Economics, University of Tokyo, Bunkyo, Tokyo, Japan

Tomoyoshi Yabu

Roles Conceptualization, Data curation, Investigation, Validation, Visualization

Affiliation Faculty of Business and Commerce, Keio University, Minato, Tokyo, Japan

Competing Interests

No authors have competing interests.