Updated on 2022/01/23


YAJIMA, Naonari
Faculty of Political Science and Economics, School of Political Science and Economics
Job title
Research Associate


  • 2017

    Waseda University   Graduate School of Economics  

  • 2015

    Waseda University   Graduate School of Economics  

  • 2011

    Takasaki City University of Economics   School of Economics  

Research Experience

  • 2019

    Waseda University   Waseda Institute of Political Economy   Research Associate

Professional Memberships


    Society of Environmental Science, Japan




    International Association for Energy Economics


    The East Asian Association of Environmental and Resource Economics


Research Areas

  • Economic policy

Research Interests

  • Urban Economics

  • Environmental Management

  • Applied microeconometrics

  • Environmental Economics


  • Energy consumption in transition: Evidence from facility-level data

    Naonari Yajima, Toshi H. Arimura, Taisuke Sadayuki

    Economics, Law, and Institutions in Asia Pacific     129 - 150  2021

     View Summary

    © 2021, The Author(s). This chapter estimated the impact of the Tokyo emissions trading scheme (ETS) and Saitama ETS on energy consumption in the manufacturing sector using a facility-level panel data set compiled from the Current Survey of Energy Consumption, a nationwide survey on energy consumption conducted by the Agency for Natural Resources and Energy in Japan. To our knowledge, no study has used this rich data set to perform sophisticated econometric analyses. We found that the Tokyo ETS reduced electricity consumption by 16%. On the other hand, we did not find evidences of switching from dirty fossil fuel to cleaner fuel associated with the introduction of the Tokyo ETS. The impact of the Saitama ETS on energy consumption was not statistically confirmed based on our samples. Additional studies are needed to identify the different impacts of the ETSs between Tokyo and Saitama. We also found that Japan has been experiencing long-term decreasing trends in the number of manufacturing facilities and the volume of fossil fuel consumption, which may reduce Japanese CO2 emissions in the long run.


  • Advancement of green public purchasing by category: Do municipality green purchasing policies have any role in japan?

    Takuro Miyamoto, Naonari Yajima, Takahiro Tsukahara, Toshi H. Arimura

    Sustainability (Switzerland)   12 ( 21 ) 1 - 24  2020.11  [Refereed]

     View Summary

    © 2020 by the authors. Licensee MDPI, Basel, Switzerland. The aim of this paper is to identify (1) the categories in which it is easier or more difficult for local municipalities to implement green purchasing and (2) the role and extent of green purchasing policy (GPP) in promoting green purchasing. To characterize the green purchasing potential of different categories, we examine the green purchasing rate, or the ratio of green products/services to total products/services purchased, of 21 categories of items. We employ data from a unique survey conducted by the Japanese Ministry of the Environment, which provides data on green procurement in municipalities. We observe that air conditioners suffer from low green purchasing rates, whereas most municipalities purchase green products in the paper products and stationery categories. We also examine the relationship between green purchasing rates and GPPs to identify the role and extent of GPPs. Our regression analyses reveal that the presence of a GPP is associated with higher implementation and measurement rates of green purchasing. This pattern is particularly evident for the categories in which many municipalities without GPPs purchase green products but, in most cases, do not measure their green purchasing rate.


  • Does Non-monetary Reward Promote Greenhouse Gas Emission Reduction?: An Evidence from Provincial-Level Policy in Japan

    Naonari Yajima

    Japan Center for Economic Research    2020  [Refereed]

  • Energy Efficiency Investment in Japanese Firms: Influences of Energy Saving Act and Organizational Factors

    Naonari Yajima, Toshi H. Arimura, Emiko Inoue

    The 6th IAEE Asian Conference    2018

  • An Econometric Analysis of Greenhouse Gas Emission Reduction Program by Provincial Governments-A Quantitative Analysis of the Manufacturing Sector-

    Naonari Yajima, Toshi H. Arimura

    Environmental Science   30 ( 2 ) 121 - 130  2017  [Refereed]


  • Effectiveness of Multiple-policy instruments: Evidence from Greenhouse Gas Reduction Policy in Japan

    Naonari YAJIMA, Toshi H. ARIMURA

    WINPEC Working Paper Series    2019.09

    Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

Research Projects

  • The Diffusion of Environmentally-Friendly Goods through Green Public Purchasing by Municipalities

    ENEOS Corporation, Waseda University 

    Project Year :


  • 報酬は温暖化対策のインセンティブとなるか

    日本学術振興会  科学研究費助成事業;研究活動スタート支援

    Project Year :


    矢島 猶雅


  • A Survey on Stigmatized Properties in Housing Environment

    Naonari YAJIMA, Taisuke SADAYUKI

    Presentation date: 2019.09

  • Incentives and Barriers for Energy Efficient Investment: Evidence from Japanese Firms

    Naonari Yajima, Toshi H. Arimura, Emiko Inoue

    GRONEN workshop: Tokyo 2019 

    Presentation date: 2019.06