Political-Theoretical Study on Proportional Representation with a Limited Majority Bonus

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K01478
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 06010:Politics-related
• Research Institution: Kyushu University
• Principal Investigator: Okazaki Seiki 九州大学, 法学研究院, 教授 (70380649)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 多数派限定優遇 / 比例代表制 / 政権選択 / 民意反映

Outline of Final Research Achievements

In this study, I have examined three problems concerning proportional representation with a limited majority bonus (PR-LMB). First, I have defended PR-LMB against the most strong rival: proportional representation with a limited transferable vote, which I have invented. Second, I have designed a concrete form of PR-LMB: PR-LMB with a complex closed-list system. And finally, I have made a constitutional judgment that PR-LMB does not violate the basic principles of the Constitution of Japan. Based on the study, I have published three articles on these topics.

Free Research Field

政治理論

Academic Significance and Societal Importance of the Research Achievements

日本でも海外でも、政権選択可能な小選挙区制 vs. 民意反映可能な比例代表制というパラダイムが支配的である。しかし、私が論じてきたように、多数派限定優遇式比例代表制は政権選択可能かつ民意反映可能な選挙制度である。その多数派限定優遇式比例代表制に関する諸問題を解決したことで、多数派限定優遇式比例代表制の説得力を高めることができたように思われる。このことは政治学に寄与するだけでなく、日本と世界の選挙制度改革にも寄与するであろう。