Updated on 2026/03/07
Declining market
Market quality
Social Learning
Price competition
Anti-dumping
Humanities & social sciences / Economic policy
Humanities & social sciences / Money and finance / Money and finance
Johns Hopkins University Department of Economics Ph.D. program
2003.9 - 2009.12
Keio University Graduate School of Economics Doctor Course
2001.4 - 2004.9
Keio University Graduate School of Economics Master Course
1999.4 - 2001.3
Keio University Faculty of Business and Commerce
1995.4 - 1999.3
Meiji University School of Commerce Professor
2024.4
Yokohama City University School of Economics and Business Administration Professor
2020.4 - 2024.3
School of Economics and Business Administration, Yokohama City University Associate Professor
2019.4 - 2020.3
Yokohama City University Global Cooperation Institute for Sustainable Cities (GCI) Director
2018.4 - 2022.3
Yokohama City University School of Economics and Business Administration Associate Professor
2015.4 - 2020.3
Chiba Keizai University Department of Economics Associate Professor
2011.4 - 2015.3
Chiba Keizai University Department of Economics Assistant Professor
2008.4 - 2011.3
World Bank Part-time researcher for university or other academic organization Short Term Consultant
2007.7 - 2008.3
Country/Region：United States
International Monetary Fund Part-time researcher for university or other academic organization Summer Intern
2006.6 - 2006.9
Country/Region：United States
Keio University Faculty of Economics Research Assistant Research Associate
2001.4 - 2003.6
Western Economic Association International
American Economic Association
Econometric Society
JAPANESE ECONOMIC ASSOCIATION
IEFS Japan
A novel content-based approach to measuring monetary policy uncertainty using fine-tuned LLMs Reviewed
Arata Ito, Masahiro Sato, Rui Ota
Finance Research Letters 106832 2025.4
Labor shortage and early robotization in Japan Reviewed
Liuchun Deng, Minako Fujio, Xin Lin, Rui Ota
Economics Letters 233 111404 - 111404 2023.12
Price Competition and Setup Cost Reviewed International journal
Rui Ota, Hiroshi Fujiu
Mathematics 9 ( 3 ) 289 - 289 2021.2
Consumers’ Perception on Product Quality: An Empirical Study on the Fukushima Nuclear Power Plant Disaster Reviewed
Rui Ota
Cities for People from Theory to Practice 270 - 275 2021
Heterogeneous impacts of Abenomics on the stock market: A Fund flow analysis Reviewed
Yoshihiro Kondo, Yoshiyuki Nakazono, Rui Ota, Qing-Yuan Sui
Journal of the Japanese and International Economies 55 101053 - 101053 2020.3
Pricing an Existing Product while Producing a New Substitute Invited
Rui Ota, Hiroshi Fujiu
The Bulletin of Yokohama City University. Social science 71 ( 2 ) 69 - 79 2020.2
Estimation of the Demand Curve in a Declining Market: The Case of the U.S. Photographic Film Market
Rui Ota
The bulletin of Yokohama City University. Social science 71 ( 1 ) 1 - 31 2020.1
Estimation of Changes in Consumer’s Preference After The Fukushima Nuclear Disaster: A case of Peach
Rui Ota, Qi Lee
The bulletin of Yokohama City University. Social science 71 ( 1 ) 33 - 56 2020.1
The 2015 Chinese Food Safety Law and market quality Reviewed
Qizhi Wang, Rui Ota
Pacific Economic Review 24 ( 5 ) 631 - 641 2019.12
An Effect of Mazda's Alliance with Ford on Marginal Cost under the Voluntary Export Restraint
Rui Ota
The bulletin of Yokohama City University. Social science 70 ( 3 ) 1 - 21 2019.3
Long-run Effects on Beef Prices of Import Liberalization (in Japanese)
Rui Ota, Suguru Saito, Toshihiro Sakaguchi
The bulletin of Yokohama City University. Social science 70 ( 2 ) 133 - 149 2019.3
Dynamic Monopoly Pricing in a Declining Industry
Rui Ota
The bulletin of Yokohama City University. Social science 70 ( 2 ) 101 - 131 2019.3
A survey on food safety regulation and international trade in Vietnam
Rui Ota, Do Thao Le
The bulletin of Yokohama City University. Social science 70 ( 3 ) 23 - 43 2019.3
A Stochastic Model of "Market Organization and Trading Relationships"
Rui Ota
The bulletin of Yokohama City University. Social science 69 ( 3 ) 1 - 11 2018.3
Dynamic Pricing in Declining Demand: The Case of Duopoly Reviewed
Rui Ota
REVIEW OF DEVELOPMENT ECONOMICS 15 ( 1 ) 78 - 92 2011.2
An Economic Analysis of a Declining Industry
Rui Ota
Chiba Keizai Ronso 43 1 - 26 2010.12
Adjustability in Production and Dynamic Effects of Domestic Competition Policy Reviewed
Rui Ota
Journal of International Trade and Economic Development 15 ( 4 ) 431 - 439 2006.12
RIETI Highlight
Rui Ota, Arata Ito, Masahiro Sato, Makoto Yano（ Role： Joint authorp. 38-39）
Researach Institute of Economy, Trade and Industry 2022.10
Essays on Pricing Strategy in A Declining Industry Reviewed
Rui Ota（ Role： Sole author）
2009 （ ISBN:9781109585537 ）
Big Government, High Debt, and Fiscal Adjustment in Small States Reviewed International journal
Stephanie Medina Cas（ Role： Joint authorChapter 3）
Islands and Small States Institute of the University of Malta, Malta and the Commonwealth Secretariat, London 2008.12
Content-based Metric on Monetary Policy Uncertainty by Using Large Language Models
Arata Ito, Masahiro Sato, Rui Ota
RIETI Discussion Paper Series 24-E-080 2024.12
Social Learning and Behavioral Change When Faced with the COVID-19 Pandemic: A big data analysis
Rui Ota, Arata Ito, Masahiro Sato, Makoto Yano
RIETI Discussion Paper Series 22-E-065 2022.7
Masahiro Sato, Rui Ota, Arata Ito, Makoto Yano
RIETI Discussion Paper Series 20-E-092 2020.12
Declining Demand and Product Quality: An Empirical Study of the Japanese PC Monitor Market
Rui Ota, Lili Zhang
RIETI Discussion Paper Series 20-E-033 1 - 20 2020.4
Dumping as a Trigger for Protectionism: A Consumer's Perspective
Makoto Yano, Fumio Dei, Rui Ota
work in progress 2017.4
The ``Law of Rising Price'' in an Imperfectly Competitive Declining Industry
Makoto Yano, Fumio Dei, Rui Ota
work in progress 2012.11
Big Government, High Debt, and Fiscal Adjustment in Small States Reviewed
Stephanie Medina Cas, Rui Ota
IMF Working Paper WP/08/39 2008.2
Automation and Structural Change in an Open Economy
Rui Ota
Western Economic Association International 100th Annual Conference 2025.6
Labor Shortage and Early Robotization in Japan
Liuchun Deng, Minako Fujio, Xin Lin, Rui Ota
Western Economic Association International 98th Annual Conference 2023.7
Consumers’ Perception on Product Quality: An Empirical Study on the Fukushima Nuclear Power Plant Disaster
Rui Ota
WEAI Virtual 96th Annual Conference 2021.6
Consumers’ Perception on Product Quality: An Empirical Study on the Fukushima Nuclear Disaster
Rui Ota
International Academic Consortium for Sustainable Cities 2020 2020.11
Content-based Metric on Monetary Policy Uncertainty by Using Large Language Models
Rui Ota
Applied Economics Workshop, Institute for Economics Studies, Keio Univeristy 2024.11
Content-based Metric on Monetary Policy Uncertainty by Using Large Language Models
Rui Ota
Western Economic Association International 99th Annual Conference 2024.7
Social Learning and Behavioral Change When Faced with the COVID-19 Pandemic: A big data analysis
Rui Ota, Arata Ito, Masahiro Sato, Makoto Yano
Japan Economic Association 2023 Spring Meeting 2023.5
The Effects of Information Reception on Consumers' Behavioral Change: Analysis of Face Mask Use at the Onset of the COVID-19 Pandemic in Japan
Rui Ota
WEAI 97th Annual Conference 2022.7
Declining Demand and Product Quality: An Empirical Study on Japanese PC Monitor Market International conference
Rui Ota
International Academic Consortium for Sustainable Cities 2019 2019.8
Price Competition and Setup Costs Invited
Rui Ota
Microeconomics Workshop, Institute for Economic Studies, Keio University 2018.11
Estimation of Changes in Consumer’s Preference After The Fukushima Nuclear Disaster International conference
Rui Ota
International Academic Consortium for Sustainable Cities 2018 2018.9
Endogenous Price Leadership and Setup Cost Reduction
Rui Ota
Japanese Economic Association Spring Meeting 2018 2018.6
Endogenous Price Leadership and Setup Cost Reduction Invited International conference
Rui Ota
IEFS Japan Annual Meeting 2017 2018.3
An impact of China's new food safety law on its capital market: An event study analysis International conference
Rui Ota
International Academic Consortium of Sustainable Cities 2017.9
An import surge as a trigger for protectionism: A consumer’s perspective International conference
Rui Ota
2016 Asia Meeting of the Econometric Society 2016.8
An import surge as a trigger for protectionism: A consumer’s perspective
Rui Ota
2016 Japanese Economic Association Spring Meeting 2016.6
An import surge as a trigger for protectionism: A consumer’s perspective International conference
Rui Ota
WEAI 12th International Conference 2016.1
Discrete Demand Shift Dumping International conference
Rui Ota
WEAI 11th International Conference 2015.1
越境データ市場の高質化に向けた基礎的分析
Grant number：25K21906 2025.6 - 2028.3
日本学術振興会 科学研究費助成事業 挑戦的研究(萌芽)
太田 塁
Grant amount：\6370000 （ Direct Cost: \4900000 、 Indirect Cost：\1470000 ）
大規模言語モデルに基づくマルチエージェント・システムを活用したイノベーション分析
Grant number：25K05330 2025.4 - 2028.3
日本学術振興会 科学研究費助成事業 基盤研究(C)
佐藤 正弘, 太田 塁
新技術の普及が国際貿易を通じて経済構造の変化に与える影響
Grant number：25K05098 2025.4 - 2028.3
日本学術振興会 科学研究費助成事業 基盤研究(C)
藤生 源子, 太田 塁
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
大規模言語モデルを用いた金融政策の不確実性の計測
2025.4 - 2027.3
全国銀行学術研究振興財団
Investigating a penetration process of new production factors: Implications from the case of industrial robots
Grant number：21K18437 2021.7 - 2024.3
Japan Society for the Promotion of Science Grant-in-Aid for Challenging Research (Exploratory) Grant-in-Aid for Challenging Research (Exploratory)
OTA Rui
Authorship：Principal investigator
Grant amount：\5850000 （ Direct Cost: \4500000 、 Indirect Cost：\1350000 ）
Empirical Analysis of Social Costs Caused By Product Defects Using Big Consumption Data
Grant number：21H00710 2021.4 - 2025.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)
Grant amount：\16640000 （ Direct Cost: \12800000 、 Indirect Cost：\3840000 ）
Empirical Analysis of Social Costs Caused By Product Defects Using Big Consumption Data
2020.4 - 2021.3
Building Consumption Bigdata for High Resolution Analysis towards Evidence-based Policy
Grant number：16H02015 2016.4 - 2021.3
Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research(A) Grant-in-Aid for Scientific Research (A)
Makoto Yano
Grant type：Competitive
This project is to investigate the use of large-scale data, which has been made available by the IT revolution. By using consumption bigdata and newspaper bigdata, we have revealed that people who face COVID-19 pandemic or health-hazardous product defects take self-protective actions by learning from socially available information. We have characterized the recent information manipulations by the use of bigdata and characterized an ecosystem in which bigdata is utilized in a healthy manner by means of the blockchain technology. Facing the COVID-19 pandemic, moreover, we have built data on behavior change and added to the high-dimensional genome cohort date, in which the principal investigator has been involved.
Effects of differences in market quality on international trade
2016.4 - 2020.3
Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research(C)
Rui Ota
Authorship：Principal investigator Grant type：Competitive
Firm behavior in declining markets
2013.4 - 2016.3
Japan Society for the Promotion of Science Grant-in-Aid for Young Scientists(B)
Rui Ota
Authorship：Principal investigator Grant type：Competitive
Pricing model in a declining industry and its applications
Grant number：21730199 2009.4 - 2012.3
Japan Society for the Promotion of Science Grant-in-Aid for Young Scientists(B) Grant-in-Aid for Young Scientists (B)
Rui Ota
Authorship：Principal investigator Grant type：Competitive
The purpose of this study is to investigate firms' pricing behavior in a declining industry. To this end, Co-authors and I develop several models including not only price competition models but also quantity competition models. Having alternative models would be beneficial to analyze applied issues, which I initially plan to study. In addition to the above theoretical contributions, two papers provide empirical analyses that support the developed model. The grant allows me to purchase POS data of photographic film whose demand has declined after the introduction of digital cameras. I compile the micro data in order to enable us to conduct more structural empirical study.
International Economics
Institution：Chiba Keizai University, Yokohama City University, Keio University
Level：Undergraduate (specialized)
Introduction to Game Theory
Institution：Yokohama City University
International Fiance
Institution：Meiji University
Industrial Organization
Institution：Yokohama National University
国際貿易論
Introduction of Economics
Institution：Chiba Keizai University, Yokohama City University
Level：Undergraduate (liberal arts)
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