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Environmental Valuation and Household Behavior in a Developing Country; The Case of Kabwe, Zambia

Research Project

Project/Area Number 19KK0040
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 7:Economics, business administration, and related fields
Research InstitutionThe University of Tokyo (2024)
Hokkaido University (2019-2023)

Principal Investigator

HIWATARI MASATO  東京大学, 大学院総合文化研究科, 准教授 (50547172)

Co-Investigator(Kenkyū-buntansha) 山田 大地  広島大学, 人間社会科学研究科(社), 准教授 (40852637)
成田 大樹  東京大学, 大学院総合文化研究科, 教授 (50746485)
Project Period (FY) 2019-10-07 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords環境評価 / 重金属 / 開発経済学 / 環境経済学 / ザンビア / 公衆衛生
Outline of Research at the Start

開発途上国において、環境汚染は深刻な健康被害をもたらすだけでなく、生産性や所得の喪失を招き、貧困の要因となり得る。しかし、環境汚染の経済コストや環境の経済的価値は、現地の人々の選好に必ずしも反映されているわけではなく、健康影響などによる人々の直接的な経済的損失と、その改善のための人々の支払い意思額の間には大きな隔たりが存在する。本研究では、ザンビア・カブウェの鉛汚染地域を対象に、環境の経済的価値について、現地調査に基づき、汚染による経済的損失と改善のための支払い意思の双方の観点から測定・推計する。両者を比較分析し、ギャップの要因を探ることで、自立的かつ持続可能な環境政策のための含意を導く。

Outline of Final Research Achievements

This study investigates severe lead pollution in Kabwe, Zambia, and estimates the associated economic costs from two perspectives: (1) household-level economic losses attributable to contamination, and (2) the willingness to pay (WTP) for environmental improvements.
We merged 2017 Kabwe Household Socio-economic Survey data (KHSS, 895 households) with blood-lead level measurements (447 individuals) to identify the causal impact of lead exposure, such as declines in equivalent consumption and rises in poverty, and to calculate the social costs, including those borne by future generations.
In August 2023, a discrete-choice experiment was administered to 878 households to elicit marginal WTP for remediation. Applying this estimated WTP to all households and comparing it with cleanup costs showed only a small gap between the estimated losses and WTP, offering valuable insights into the feasibility of participatory pollution-control measures in developing countries.

Academic Significance and Societal Importance of the Research Achievements

本研究は、重度の鉛汚染による家計の経済損失を貨幣価値で提示し、これを住民の支払意思額と比較した初の試みである。途上国都市において鉛曝露が生活の質をどの程度低下させるかを因果的に示した点、将来世代を含む社会的費用を試算した点も大きな学術的貢献となる。家計調査と血液データを統合した本手法は、他地域への応用が可能であり、環境経済学と公衆衛生学の発展、さらには低中所得国における地域主導型の環境政策の策定に寄与し得る。

Report

(7 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (19 results)

All 2025 2024 2023 2022 2020 2019 Other

All Int'l Joint Research (7 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (7 results) (of which Int'l Joint Research: 3 results) Funded Workshop (1 results)

  • [Int'l Joint Research] University of Zambia(ザンビア)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Chr. Michelson Institute (CMI)(ノルウェー)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] ザンビア大学(ザンビア)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] University of Zambia(ザンビア)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ザンビア大学(ザンビア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ザンビア大学(ザンビア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ザンビア大学(ザンビア)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Toxic pollution and poverty: economic impacts of lead (Pb) exposure on household welfare in Zambia2024

    • Author(s)
      Hiwatari, Masato, Daichi Yamada, Daiju Narita, Peter Hangoma, Bona Chitah
    • Journal Title

      Ecological Economics

      Volume: 221C, 108209 Pages: 1-11

    • DOI

      10.1016/j.ecolecon.2024.108209

    • Related Report
      2024 Annual Research Report 2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Social cost of mining-related lead (Pb) pollution in Kabwe, Zambia, and potential remediation measures2023

    • Author(s)
      Yamada Daichi、Hiwatari Masato、Narita Daiju、Hangoma Peter、Chitah Bona、Nakata Hokuto、Nakayama Shouta M.M.、Yabe John、Ito Mayumi、Igarashi Toshifumi、Ishizuka Mayumi、Zyambo Golden
    • Journal Title

      Science of The Total Environment

      Volume: 865 Pages: 161281-161281

    • DOI

      10.1016/j.scitotenv.2022.161281

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Assessing the population-wide exposure to lead pollution in Kabwe, Zambia: an econometric estimation based on survey data2020

    • Author(s)
      Yamada Daichi、Hiwatari Masato、Hangoma Peter、Narita Daiju、Mphuka Chrispin、Chitah Bona、Yabe John、Nakayama Shouta M. M.、Nakata Hokuto、Choongo Kennedy、Ishizuka Mayumi
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 15092-15092

    • DOI

      10.1038/s41598-020-71998-5

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Current trends of blood lead levels, distribution patterns and exposure variations among household members in Kabwe, Zambia2020

    • Author(s)
      Yabe John、Nakayama Shouta MM.、Nakata Hokuto、Toyomaki Haruya、Yohannes Yared B.、Muzandu Kaampwe、Kataba Andrew、Zyambo Golden、Hiwatari Masato、Narita Daiju、Yamada Daichi、Hangoma Peter、Munyinda Nosiku Sipilanyambe、Mufune Tiza、Ikenaka Yoshinori、Choongo Kennedy、Ishizuka Mayumi
    • Journal Title

      Chemosphere

      Volume: 243 Pages: 125412-125412

    • DOI

      10.1016/j.chemosphere.2019.125412

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Public Preferences for Reducing Mining-Related Lead Pollution: Estimation of Willingness to Pay Through a Discrete Choice Experiment in Kabwe, Zambia2025

    • Author(s)
      Daiju Narita
    • Organizer
      Zambia Research Seminar, 北海道大学獣医学部
    • Related Report
      2024 Annual Research Report
  • [Presentation] Public Preferences for Reducing Mining-Related Lead Pollution: Estimation of Willingness to Pay Through a Discrete Choice Experiment in Kabwe, Zambia2025

    • Author(s)
      成田 大樹
    • Organizer
      日本経済学会2025年度春季大会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Toxic pollution and poverty: economic impacts of lead (Pb) exposure on household welfare in Zambia2024

    • Author(s)
      Masato Hiwatari
    • Organizer
      Poverty/health seminar, Chr. Michelsen institute
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Public Preferences for Remediation of Mining-Related Lead Contamination: A Discrete Choice Experiment in Kabwe, Zambia2024

    • Author(s)
      Daiju Narita
    • Organizer
      Poverty/health seminar, Chr. Michelsen institute
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 環境汚染と貧困ーザンビアの鉛汚染問題への学際的アプローチによる挑戦2024

    • Author(s)
      樋渡雅人
    • Organizer
      国際関係論研究会第209回定例研究会,東京大学大学院総合文化研究科
    • Related Report
      2024 Annual Research Report
  • [Presentation] Lead Pollution and Poverty in a Developing Country: The Case of Kabwe in Zambia2022

    • Author(s)
      Masato, Hiwatari
    • Organizer
      Third Japanese-American-German Kavli Frontiers of Science Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] ザンビアにおける鉛汚染:血中鉛濃度データと家計調査データに基づく推計・予測2019

    • Author(s)
      山田大地, 樋渡雅人
    • Organizer
      比較経済体制学会第59回全国大会
    • Related Report
      2019 Research-status Report
  • [Funded Workshop] Poverty/health seminar, Chr. Michelsen institute2024

    • Related Report
      2024 Annual Research Report

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Published: 2019-10-10   Modified: 2026-01-16  

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