研究者一覧

研究者

2026.08.14 更新

加藤 晋
CATO Susumu

所属部門	比較現代経済部門　教授
専門分野	厚生経済学、公共経済学
e-mail	cato[at]iss.u-tokyo.ac.jp [at]を@に置き換えてください。
個人ページ	https://sites.google.com/site/susumucato/

経　歴

研究テーマ

1社会的選択理論

民主的な意思決定の背後にある論理構造を明らかにする．特に，アローの研究を嚆矢とする公理論的手法によって，社会的選好の合理性と人口構造の関連について研究を進めている．また，このような研究を通じて，社会の「幸福」「福祉」をいかにして測ることが可能であろうかという問題について考察している．

2価値論

状態の善さをいかにして測ることができるだろうか。道徳的価値の意味を問う作業を，公理的な分析枠組みを基にして検討している．特に，価値の根源が，一定の時間ごとに判断されるべきか，それとも，人生全体の厚生の集計値に基づいて判断されるべきか，分析している．

3人口倫理

ある政策が，人口に変化をもたらすような場合に，どのように道徳的判断を行うことができるだろうか．例えば，帰結だけに注目をして議論をするとしても，あるいは，功利主義的なアプローチをとることにコミットしたとしても，人口サイズの異なる二つの状態を比較する方法は自明ではない．このような人口倫理の問題に関する不可能性と可能性について分析を行う．

4産業組織論

第1に，市場に公営企業と私企業の存在する混合寡占市場の研究に取り組んできた．特に貿易との関連について検討を進めた．第2に，自由参入市場におけるさまざまな競争政策の経済厚生に与える影響について研究を進めている．第3に，寡占市場における合併やリーダー企業の存在の経済厚生に対する含意を検討している．

5最適な経済組織構造と賃金プロファイル

限定合理的な個人の存在する状況における，組織のガバナンス問題を検討している．

6環境問題と持続可能性

世代間公平性と持続可能性の関係を検討し，環境資源をどのように維持していくべきかを考察している．

7福祉と公正

多次元的な福祉の概念を構成し，公正な社会の達成するための最適な制度に関する研究を行っている．

主要業績

学術書

• 宇野重規・加藤晋・井上彰(編)（2026）『リベラリズム：基礎からフロンティアまで』東京大学出版会
• 宇野重規・加藤晋・飯田高(編)（2025）『社会科学のメソドロジー2：測ることの社会科学』東京大学出版会
• 宇野重規・加藤晋・保城広至(編)（2025）『社会科学のメソドロジー1：価値と事象の社会科学』東京大学出版会
• 加藤晋・ケネス・盛・マッケルウェイン(共編)（2024）『パンデミックと社会科学ーーポストコロナから見えてくるもの』勁草書房
• 大瀧雅之・加藤晋(編)（2017）『ケインズとその時代を読む: 危機の時代の経済学ブックガイド』東京大学出版会

学術論文

• Lyu, Z. and Cato, S. (2026). “How empathy and partisanship affected attitude changes following the assassination of Shinzo Abe: evidence from panel surveys” Public Opinion Quarterly, 90(2), 518-535.
• Cato, S., and Ishida, S. (2026). “Multi-species population ethics with critical levels” Erkenntnis, 91, 541-560.
• Bossert, W., Cato, S., and Kamaga, K. (2026). “The structure of critical sets” Philosophical Studies, 183, 93-120.
• Adler, M.D., Bossert, W., Cato, S., and Kamaga, K. (2025). “Ex-post approaches to prioritarianism and sufficientarianism” Theoretical Economics, 20(4), 1367-1410.
• Yahagi, K. and Cato, S. (2025). “Effects of sanctions on criminalized prostitution markets” Review of Law & Economics, 21(3), 655-673.
• Cato, S., Gonzalez, S., Remila, E., and Solal, P. (2025). “An axiomatic characterization of the proportional threshold methods: A geometric approach” Social Choice and Welfare, 66, 619-645.
• Cato, S. (2025). “Acyclic population ethics and menu-dependent relations” Economics and Philosophy, 41(2), 427-439.
• Cato, S. (2025). “Rational incompetence of voters” Journal of Ethics and Social Philosophy, 30(2), 329-338.
• Cato, S., and Oshitani, K. (2025). “Positional conditional egalitarianism” Inquiry, 1-11.
• Tsunami-tendenko follows the antiextinction principle, not utilitarianism. (joint work with Oshitani, K.), Journal of Medical Ethics, 51(3), 203–204, (2025).
• Sufficientarianism and incommensurability. Philosophical Studies, 181(12), 3439–3458, (2024).
• Timeslice prioritarianism, prudence, and weak Pareto. (joint work with Hirose, I.), Australasian Journal of Philosophy, 102(4), 1–6, (2024).
• Stable dystopia: A critique of the circular definition of stability in Nozick’s model of utopia. (joint work with Chung, H.), Analysis, 84(3), 465–475, (2024).
• Repugnance at the limit. (joint work with Harada, K., & Oshitani, K.), Ratio, 37(2-3), 231–240, (2024).
• Smallest quasi-transitive extensions. (joint work with Bossert, W., & Kamaga, K.), Journal of Mathematical Economics, 112, 102983, (2024).
• When is weak Pareto equivalent to strong Pareto? Economics Letters, 222, (2023), 110953.
• Strategic crackdown on organized crime by local governments. (joint work with Yahagi, K.) Economics of Governance, (2023).
  https://doi.org/10.1007/s10101-023-00293-6(2023)
• Revisiting variable-value population principles. (joint work with Bossert, W., & Kamaga, K.) Economics & Philosophy, 1-17, (2022).
  doi:10.1017/S0266267122000268
• Are good leaders truly good? (joint work with Inoue, A.) Analysis, (2022). accepted.
• Thresholds, critical levels, and generalized sufficientarian principles. (joint work with Bossert, W., & Kamaga, K.) Economic Theory, (2022).
  https://doi.org/10.1007/s00199-022-01439-z
• 「実践と公正：フェアプレイをめぐる概念分析と経済分析」（宮本 雅也と共著）社会科学研究, 74巻, 45-61.
• Mobile health technology as a solution to self-control problems: The behavioral impact of COVID-19 contact tracing apps in Japan. (joint work with Shoji, M., Ito, A., Iida, T., Ishida, K., Katsumata, H., & McElwain, K. M.) Social Science & Medicine, 306, (2022), 115142.
• Understanding the function of a social business ecosystem. (joint work with Nakamura, H.) Sustainability, 14(15), (2022), 9325.
• Generalized Poverty-gap Orderings. (joit work with Bossert, W., & Kamaga, K.) Social Indicators Research, 164(1), (2022), 189-215.
• Critical-level Sufficientarianism. (joint work with Bossert, W., & Kamaga, K.) Journal of Political Philosophy, 30(4), (2022), 434-461.
• Libertarian approaches to the COVID–19 pandemic. (joint work with Akira Inoue), Bioethics, 36(4), 445-452.
  DOI: https://doi.org/10.1111/bioe.13007(2022)
• Stable preference aggregation with infinite population. Social Choice and Welfare, (2022),59(2), 2022, 287-304. DOI: https://doi.org/10.1007/s00355-022-01389-4
• Vaccination and altruism under the COVID-19 pandemic. (joint work with Iida, T., Ishida, K., Ito, A., Katsumata, H., McElwain, K. M., & Shoji, M.) Public Health in Practice, (2022), 100225.
• Critical-level Sufficientarianism. (joint work with Bossert, W., & Kamaga, K.), Journal of Political Philosophy, (2021).
• Variations in Early-Stage Responses to Pandemics: Survey Evidence from the COVID-19 Pandemic in Japan. (joint work with Shoji, M., Iida, T., Ishida, K., Ito, A., & McElwain, K. M.) Economics of disasters and climate change, (2021), 1-24.
• Infinite-population approval voting: A proposal. (joint work with Rémila, E., & Solal, P.), Synthese, (2021), 199(3), 10181-10209.
• Social media infodemics and social distancing under the COVID-19 pandemic: public good provisions under uncertainty. (joint work with Iida, T., Ishida, K., Ito, A., Katsumata, H., McElwain, K. M., & Shoji, M.), Global health action, (2021), 14(1), 1995958.
• What should we agree on about the repugnant conclusion?. (joint work with Zuber, S., Venkatesh, N., Tännsjö, T., Tarsney, C., Stefánsson, H. O., Steele, K., & Asheim, G. B.), Utilitas, (2021), 33(4), 379-383.
• Prosociality and the uptake of COVID-19 contact tracing apps: survey analysis of intergenerational differences in Japan. (joint work with Shoji, M., Ito, A., Iida, T., Ishida, K., Katsumata, H., & McElwain, K. M.), JMIR mHealth and uHealth, (2021), 9(8), e29923.
• Superset-robust collective choice rules. (joint work with Bossert, W.), Mathematical Social Sciences, (2021), 109, 126-136.
• M.A Rehabilitation of the Institutional Approach to Japanese Economic History: Introduction to the Special Issue. (joint work with Nakabayashi, M.), Social Science Japan Journal.
• 特集「リベラルな社会を読み解く」 序 『社会科学研究』第71巻第1号，2020年6月.
• 「正義論における規則と実践：サールの言語論から読み解くロールズ」『社会科学研究』第71巻第1号，2020年6月.
• COVID-19 and social distancing in the absence of legal enforcement: Survey evidence from Japan. (joint work with Shoji, M., Iida, T., Ishida, K., Ito, A., & McElwain, K.), MPRA Paper, (2020).
• Social distancing as a public good under the COVID-19 pandemic. (joint work with Iida, T., Ishida, K., Ito, A., McElwain, K. M., & Shoji, M.), Public health, (2020), 188, 51-53.
• From the St. Petersburg paradox to the dismal theorem. Environment and Development Economics, (2020), 25(5), 423-432.
• Quasi-stationary social welfare functions. Theory and Decision, (2020), 1-22.
• Extending the Intersection Approach. Journal of Human Development and Capabilities, (2020), 21(3), 230-248.
• Incompleteness, regularity, and collective preference. Metroeconomica, (2020), 71(2), 333-344.
• Emission Taxes and Optimal Refunding Schemes with Endogenous Market Structure, Environmental and Resource Economics (2010), 46, 275-280.
• Acyclicity, Anonymity, and Prefilters (joint work with Bossert W). Journal of Mathematical Economics, (2020), 87, 134-141.
• Optimal Production Tax in a Mixed Market with an Endogenous Market Structure (joint work with Matsumira T). The Manchester School, (2019), 87(4), 578-590.
• Entry-License Tax: Stackelberg versus Cournot (joint work with Matsumira T). Journal of Institutional and Theoretical Economics, (2019), 175(2), 258-271.
• Remarks on a Procedural Condition for the Voting Paradox. Bulletin of Economic Research, (2019), 71(3), 549-557.
• The Possibility of Paretian Anonymous Decision-Making with an Infinite Population. Social Choice and Welfare, (2019), 53(4), 587-601.
• 「ロールズと規範経済学」『ロールズを読む』井上彰（編）ナカニシヤ出版，2018.
• Decisive coalitions and positive responsiveness. Metroeconomica (2018), 69(1), 308-323.
• On the existence of an equitable allocation. Metroeconomica, 69(3), 644-654, 2018.
• Choice functions and weak Nash axioms. Review of Economic Design, 22(3-4), 159-176, 2018.
• Incomplete decision-making and Arrow’s impossibility theorem. Mathematical Social Sciences, 94, 58-64, 2018.
• Infinite population and positive responsiveness: a note. Economics Bulletin(2018), 38(1), 196-200.
• Hybrid invariance and oligarchic structures. The B.E. Journal of Theoretical Economics (BEJTE) (2018), 18(1).
• Collective rationality and decisiveness coherence. Social Choice and Welfare (2017), 50(2), 305–328.
• Transparency and performance evaluation in sequential agency (joint with Akifumi Ishihara), Journal of Law, Economics, & Organization (2017), 33(3), 475-506.
• Unanimity, anonymity, and infinite population. Journal of Mathematical Economics (2017), 71, 28-35.
• The optimal tariff structure and foreign penetration. Asia-Pacific Journal of Accounting & Economics, (2017) 24(1-2), 83-94
• Weak independence and the Pareto principle. Social Choice and Welfare (2016), 47(2), 295-314.
• Conditions on social preference cycles. Theory and Decision (2015), 79(1), 1-13.
• Weak independence and social semi-orders. Japanese Economic Review (2015), 66(3), 311–321.
• Weak independent decisiveness and the existence of a unique vetoer. Economics Letters (2015), 131, 59-61.
• Optimal privatization and trade policies with endogenous market structure (joint work with Toshihiro Matsumura). Economic Record (2015) 91(294), 309–323. doi: 10.1111/1475-4932.12189.
• Extended anonymity and Paretian relations on infinite utility streams (joint work with Tsuyoshi Adachi and Kohei Kamaga). Mathematical Social Sciences (2014), 72, 24–32.
• Common preference, non-consequential features, and collective decision making. Review of Economic Design (2014), 18(4), 265-287.
• Independence of irrelevant alternatives revisited. Theory and Decision (2014), 76(4), 511-527.
• Menu dependence and group decision making. Group Decision and Negotiation (2014), 23(3), 561-577.
• Social choice, the strong Pareto principle, and conditional decisiveness. Theory and Decision, 75(4), 563-579.
• Alternative proofs of Arrow's general possibility theorem. Economic Theory Bulletin (2013), 1(2), 131-137.
• The first-order approach to the principal-agent problems under inequality aversion. Operations Research Letters (2013), 41(5), 526-52
• Competitiveness and R&D competition revisited (joint work with Noriaki Matsushima and Toshihiro Matsumura). Economic Modelling (2013), 31, 541–547
• Merger and entry-license tax (joint work with Toshihiro Matsumura). Economics Letters (2013), 119, 11-13
• Long-run effects of tax policies in a mixed market (joint work with Toshihiro Matsumura). FinanzArchiv: Public Finance Analysis (2013), 69, 215-240.
• Remarks on Suzumura consistent collective choice rules. Mathematical Social Sciences (2013), 65, 40–47.
• Quasi-decisiveness, quasi-ultrafilter, and social quasi-orderings. Social Choice and Welfare (2013),41,169-202.
• Leaders and Competitors (joint work with Ryoko Oki). Journal of Economics (2012), 107, 239-255.
• Long-run effects of foreign penetration on privatization policies (joint work with Toshihiro Matsumura). Journal of Institutional and Theoretical Economics (2012), 168, 444-454.
• Complements and consistent closures. Discrete Mathematics (2012), 312, 1218-1221.
• A note on the extension of a binary relation on a set to the power set. Economics Letters (2012), 116, 46-48.
• Fair allocations in large economies with unequal production Skills. International Journal of Economic Theory (2012), 8, 321-336.
• Szpilrajn, Arrow, and Suzumura: concise proofs of extension theorems and an extension. Metroeconomica (2012), 63, 235-249.
• Social Choice without the Pareto Principle: A Comprehensive Analysis. Social Choice and Welfare (2012), 39, 869-889. DOI: 10.1007/s00355-011-0564-z
• A generalization of Campbell and Kelly's trade-off theorem (joint work with Yohei Sekiguchi). Social Choice and Welfare (2012), 38, 237-246.
• The efficiency of the state-owned firm and social welfare: a note. Bulletin of Economic Research (2012), 64, 275-285.
• Pareto Principles, positive responsiveness, and majority decisions. Theory and Decision(2011), 71, 503-518.
• The top-dog and the lean and hungry look strategies in endogenous entry (joint work with Ryoko Oki). Economic Modelling (2011), 28, 2776-2782.
• Maskin monotonicity and infinite individuals. Economics Letters (2011), 110, 56-59.
• Privatization policy and cost-reducing investment by the private sector. The Manchester School (2011), 79, 1157–1178.
• Local envy-freeness and equal-income Walrasian allocations. Economics Letters (2010), 107, 239-241.
• Brief proofs of Arrovian impossibility theorems. Social Choice and Welfare (2010), 35, 267-284.
• Local Strict Envy-freeness in Large Economies. Mathematical Social Sciences (2010), 59, 319-322.
• Collective choice rules and collective rationality: a unified method of characterizations (with D. Hirata). Social Choice and Welfare (2010), 34, 611-630.
• Another induction proof of the Gibbard-Satterthwaite theorem. Economics Letters (2009), 105, 239-241.

MISC

• 「COVID-19をめぐる政策・法制度」（司会：森大輔、基調講演：大竹文雄、パネリスト：太田匡彦・加藤晋・米村滋人）, (2024).

教育活動

東京大学大学院 経済学研究科

「Formal Foundations of Politics, Philosophy, and Economics」