SUMIYA Kazuhiko

SUMIYA Kazuhiko

SUMIYA Kazuhiko

Fellow (Policy Economist)

Personal website

Activities at RIETI


Labor Economics, Public Economics, Applied Microeconometrics


2018 PhD in Economics; Royal Holloway, University of London
2014 MRes in Economics; University College London
2012 MA in Economics; University of Tokyo
2009 BA in Economics; University of Tokyo


2019 - Present Fellow (Policy Economist); Research Institute of Economy, Trade and Industry
2018 - 2019 Postdoctoral Fellow; Aarhus University

Visiting Positions and Other Employment
2021 - Present Visiting Researcher; Waseda University
2021 - 2022 Part-time Consultant; Ministry of Economy, Trade and Industry
2021 - 2022 Part-time Researcher; Cabinet Office
2019 - 2021 Part-time Researcher; Waseda University

Selected Publications and Papers

  • Ando, M., Furukawa, C., Nakata, D., & Sumiya, K. (2020). Fiscal Responses to the COVID-19 Crisis in Japan: The First Six Months. National Tax Journal, 73(3), 901–926.
  • Income Taxes, Pre-tax Hourly Wages, and the Anatomy of Behavioral Responses: Evidence from a Danish Tax Reform (2020) with Jesper Bagger
  • Income Taxation and the Equilibrium Allocation of Labor (2018) with Jesper Bagger, Mads Hejlesen, and Rune Vejlin