2023 Fiscal Year Final Research Report
A comprehensive analysis of the effects of income transfers on the stability of international environmental agreements
| Project/Area Number |
21K01485
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 07040:Economic policy-related
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 国際環境協定 / 提携形成ゲーム / 所得移転 |
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| Outline of Final Research Achievements |
In order to realize desirable international environmental agreements, we consider an "income transfer rule" that would transfer funds to countries that wish to withdraw from the agreement in return for joining. We analyze two types of transfers: "internal transfers" carried out between member countries and "external transfers" carried out by some non-member countries (supporters).
Under the strong asymmetry assumption that two types of countries coexist and the benefits and costs of pollution reduction for each type are significantly different, the agreement can be expanded for both internal and external transfers, but external transfers are found to be more effective.
We further analyze external transfers and show the existence of a stable agreement in which all countries other than supporters join under reasonable conditions, when applying the rule of minimum participation number regarding supporters. We also conduct numerical experiments to support the above findings.
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| Free Research Field |
環境経済学
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| Academic Significance and Societal Importance of the Research Achievements |
国際環境協定を安定化させるための所得移転ルールについては，学術的にも現実の政策上の議論においても，大きく注目されてきた．しかし学術的には，すべての国が同一であるなどきわめて単純な仮定の下で研究が行われている．また現実に即したデータを用いた研究では，解の導出をシミュレーションに頼っており，解の性質についての理論的な議論はなされていない．本研究によって，非対称性をもつ国が混在する状況における内部移転，外部移転の比較がなされ，外部移転という新しい形の移転ルールの有用性が一般的な形で初めて示された．この結果は現実の環境問題についての国家間交渉という面からも意義深いものである．
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