Updated on 2025/07/12
博士(経済学) ( 2001.5 大阪大学 )
修士(経済学) ( 1997.3 大阪大学 )
Theory of Industrial Organization
International Economics
Humanities & Social Sciences / Economic theory
Humanities & Social Sciences / Economic policy / Theory of Industrial Organization
Niigata University Faculty of Economic Sciences Professor
2021.4
Country：Japan
Niigata University Faculty of Economic Sciences Associate Professor
2020.4 - 2021.3
Country：Japan
Niigata University Faculy of Economics Associate Professor
2001.4 - 2020.3
Country：Japan
Niigata University Faculty of Economics Lecturer
2000.4 - 2001.3
Country：Japan
Niigata University Department of Interdisciplinary Economic Studies, Faculty of Economic Sciences Professor
2021.4
Niigata University Institute of Humanities and Social Sciences, Academic Assembly Professor
2021.4
Niigata University Faculty of Economic Sciences Department of Interdisciplinary Economic Studies Associate Professor
2020.4 - 2021.3
Niigata University Graduate School of Modern Society and Culture Economics and Management Associate Professor
2012.4 - 2020.3
Niigata University Graduate School of Modern Society and Culture Multisocial Studies Associate Professor
2012.4 - 2020.3
Niigata University Faculty of Economics Department of Business Administration Associate Professor
2001.4 - 2020.3
Osaka University Graduate School of Economics Doctoral Course
1997.4 - 2000.3
Osaka University Graduate School of Economics Master Course
1995.4 - 1997.3
Osaka University Faculty of Economics Department of Economics
1991.4 - 1995.3
JAPANESE ECONOMIC ASSOCIATION
THE JAPAN SOCIETY OF INTERNATIONAL ECONOMICS
Intra-industry Trade Under Sequential-move Duopoly: An Extension of the Endogenous Horizontal Product Differentiation Model
Kojun Hamada
Journal of Economics, Niigata University 118 ( 2024-II ) 25 - 52 2025.3
Privatization Versus Managerial Delegation: Revisiting Delegation in a Mixed Duopoly Reviewed
Kojun Hamada, Hideya Kato
Managerial and Decision Economics 46 ( 3 ) 1763 - 1773 2025.1
Product Standards Policy Under a Monopoly Market with Negative Externalities
Kojun Hamada, Yasuhiro Takarada
Journal of Economics, Niigata University 117 ( 2024-I ) 1 - 21 2024.9
The Effects of Automation on Capital Accumulation and Skilled and Unskilled Labor
Kojun Hamada
Journal of Economics, Niigata University 116 ( 2023-II ) 19 - 43 2024.3
Impact of PAYG Pensions on Country Welfare Through Capital Accumulation Reviewed
Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara
International Economics and Economic Policy 21 207 - 226 2024.1
The Optimal Specific or Ad Valorem Tax When the Other Tax Is Exogenously Imposed in a Free-entry Cournot Oligopoly Market Reviewed
Kojun Hamada, Takao Ohkawa, Makoto Okamura
Bulletin of Economic Research 76 ( 1 ) 251 - 266 2024.1
Subsidy and Tax Policy That Induces Firms to Self-select Production Technology with Negative Externalities
Kojun Hamada
Journal of Economics, Niigata University 115 ( 2023-I ) 1 - 26 2023.9
Organizational Structure and Technological Investment Revisited: An Explanation Based on the Property Rights Approach Reviewed
Kojun Hamada
Research in Economics 77 ( 3 ) 390 - 401 2023.6
Edgeworth's Taxation Paradox When Firms Engage in Cost‐reducing Investment Reviewed
Kojun Hamada, Takao Ohkawa, Makoto Okamura
Scottish Journal of Political Economy 70 ( 4 ) 391 - 397 2023.5
A Study on Immigration of Skilled and Unskilled Workers and Its Impact on Economic Growth
Kojun Hamada
Journal of Economics, Niigata University 114 ( 2022-II ) 15 - 37 2023.3
A Study on Firms' Location Choice and Governments' Tax Competition: Tax Coordination and Import Tariff
Kojun Hamada
Journal of Economics, Niigata University 113 ( 2022-I ) 1 - 31 2022.9
A Duopoly of Strategic CSR Firms Reviewed
Kojun Hamada
Journal of Institutional and Theoretical Economics 178 ( 3 ) 258 - 279 2022.9
Optimal Taxation in a Free-entry Cournot Oligopoly: The Average Cost Function Approach Reviewed
Kojun Hamada, Takao Ohkawa, Makoto Okamura
Canadian Journal of Economics 55 ( 2 ) 1166 - 1192 2022.6
Fertility Decline and a Pay‐as‐you‐go Pension System in a Two‐sector Model Reviewed
Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara
Metroeconomica 73 ( 2 ) 466 - 480 2022.5
Commodity Tax Competition and Cross-border Shopping in a Tripoint Model Reviewed
Kojun Hamada
Asia-Pacific Journal of Regional Science 6 837 - 862 2022.3
Hereditary and Acquired Altruism in an Overlapping Generations Model with Heterogeneous Agents
Kojun Hamada
Journal of Economics, Niigata University 112 ( 2021-II ) 1 - 20 2022.3
Endogenous Timing in a Mixed Duopoly Under the Optimal Degree of Privatization Reviewed
Kojun Hamada
Annals of Public and Cooperative Economics 92 ( 4 ) 689 - 704 2021.12
Mixed Duopoly in Price Competition Under the Optimal Privatization Rate Reviewed
Kojun Hamada
Economics Bulletin 41 ( 3 ) 1282 - 1291 2021.9
The Impact of AI on Economic Growth: A Survey on Models and Singularities
Kojun Hamada
Journal of Economics, Niigata University 111 ( 2021-I ) 1 - 20 2021.9
Kojun Hamada, Yoshitomo Ogawa, Mitsuyoshi Yanagihara
International Economic Journal 35 ( 3 ) 323 - 343 2021.5
The Number of Firms in a Free-entry Equilibrium in Successive Oligopoly: A Case of Linear Model
Kojun HAMADA
Journal of Economics, Niigata University 110 ( 2020-II ) 1 - 15 2021.3
Generalization of Strategic Delegation Reviewed
Kojun Hamada
Japanese Economic Review 74 199 - 214 2021.1
Privatization and the Optimal Discriminatory Subsidy: A Mixed Duopoly with Subsidy Distortion
Kojun Hamada
Journal of Economics, Niigata University 109 ( 2020-I ) 49 - 76 2020.9
Cooperative Managerial Delegation Revisited: Including the Firm's Cost as a Managerial Objective Reviewed
Kojun Hamada
Bulletin of Economic Research 73 ( 2 ) 171 - 178 2020.6
A Study on the Financing of Pay-as-you-go Pension Systems: From Income Tax to Consumption Tax
Kojun HAMADA
Journal of Economics, Niigata University 108 ( 2019-II ) 1 - 21 2020.3
Mixed Duopoly in Quantity Competition under the Optimal Privatization Rate Reviewed
Kojun HAMADA
Economics Bulletin 40 ( 1 ) 689 - 698 2020.3
Optimal Discriminatory Subsidy to Duopoly Firms with Different Costs: When There Is Distortion of Subsidy Policy
Kojun HAMADA
The Journal of Economics, Niigata University 107 ( 2019-I ) 23 - 36 2019.9
Revised Fishery Act and Individual Quota (IQ) System Invited
Kojun HAMADA
Gakushikai Kaiho 937 ( 2019-IV ) 49 - 54 2019.7
Optimal Discriminatory Subsidy in Mixed Oligopoly with Subsidy Distortion
Kojun HAMADA
The Journal of Economics, Niigata University 106 ( 2018-II ) 1 - 17 2019.3
Population Growth and the Transfer Paradox in an Overlapping Generations Model Reviewed
Kojun Hamada, Tsuyoshi Shinozaki, Mitsuyoshi Yanagihara
Review of Development Economics 23 ( 1 ) 331 - 347 2019.2
Merger Control under Asymmetric Information
Kojun HAMADA
The Journal of Economics, Niigata University 105 ( 2018-I ) 1 - 18 2018.9
INSUFFICIENT ENTRY OF EMPLOYEE-CONTROLLED FIRMS IN A FREE-ENTRY OLIGOPOLY Reviewed
Kojun Hamada, Takao Ohkawa, Makoto Okamura
Annals of Public and Cooperative Economics 89 ( 2 ) 437 - 448 2018.6
Privatization Neutrality Theorem: When a Public Firm Pursues General Objectives Reviewed
Kojun Hamada
Japanese Economic Review 69 ( 1 ) 59 - 68 2018.3
Privatization and Advertising Investment: Comparative Analysis of Advertising Competition in Mixed and Pure Oligopoly
Kojun HAMADA
The Journal of Economics, Niigata University 104 ( 2017-II ) 1 - 40 2018.3
Oligopolistic competition in the banking market and economic growth Reviewed
Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara
Economic Modelling 68 239 - 248 2018.1
Aspirations and the transfer paradox in an overlapping generations model Reviewed
Kojun Hamada, Tsuyoshi Shinozaki, Mitsuyoshi Yanagihara
JOURNAL OF ECONOMICS 122 ( 3 ) 279 - 301 2017.11
Incentive for innovation and the optimal allocation of patents Reviewed
Kojun Hamada
AUSTRALIAN JOURNAL OF MANAGEMENT 42 ( 4 ) 692 - 707 2017.11
Advertising Competition in a Pure Oligopoly
Kojun HAMADA
The Journal of Economics, Niigata University 103 ( 2017-I ) 19 - 40 2017.9
The transfer paradox in a pay-as-you-go pension system Reviewed
Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara
International Economics and Economic Policy 14 ( 2 ) 221 - 238 2017.4
Advertising Competition in a Mixed Oligopoly Revisited
Kojun HAMADA
The Journal of Economics, Niigata University 102 ( 2016-II ) 11 - 35 2017.3
世代間所得再分配とトランスファー問題 -国内所得分配が国際援助の厚生効果に与える影響-
金子昭彦, 濱田弘潤, 柳原光芳
公共経済学研究VI [中京大学経済学部附属経済研究所研究叢書] 53-81 2017.3
ALTERNATIVE STRATEGIES OF A PUBLIC ENTERPRISE IN OLIGOPOLY REVISITED: AN EXTENSION TO STACKELBERG COMPETITION Reviewed
Kojun Hamada
BULLETIN OF ECONOMIC RESEARCH 68 ( S1 ) S85 - S96 2016.12
Introduction of an Individual Quota (IQ) System in Japan's Fishing Industry: An Economic Analysis
Kojun HAMADA
SPACE NIRA 06 ( A ) 2016.11
The Transfer Problem and Intergenerational Allocation in an Overlapping Generations Model Reviewed
Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara
International Economic Journal 30 ( 4 ) 599 - 615 2016.10
Consumption Externality and the Transfer Paradox in an Overlapping Generations Model
Kojun HAMADA
The Journal of Economics, Niigata University 101 ( 2016-I ) 1 - 22 2016.9
Privatization Neutrality Theorem in a Mixed Oligopoly with Firm Asymmetry Reviewed
Kojun HAMADA
Economics Bulletin 36 ( 1 ) 395 - 400 2016.3
Mergers between a Public Firm and a Private Firm in a Mixed Oligopoly
Kojun HAMADA
The Journal of Economics, Niigata University 100 ( 2015-II ) 1 - 41 2016.3
Intergenerational altruism and the transfer paradox in an overlapping generations model Reviewed
Kojun Hamada, Mitsuyoshi Yanagihara
Quarterly Review of Economics and Finance 59 161 - 167 2016.2
A Survey of Privatization and Optimal Subsidy and Tariff Policy in International Mixed Oligopoly
Kojun HAMADA
The Journal of Economics, Niigata University 99 ( 2015-I ) 45 - 89 2015.9
Endogenous Timing in a Mixed Oligopoly Revisited
Kojun HAMADA
The Journal of Economics, Niigata University 98 ( 2014-II ) 1 - 42 2015.3
Donor Altruism and the Transfer Paradox in an Overlapping Generations Model Reviewed
Kojun Hamada, Mitsuyoshi Yanagihara
REVIEW OF INTERNATIONAL ECONOMICS 22 ( 5 ) 905 - 922 2014.11
Kojun HAMADA, LI Kunli
The Journal of Economics, Niigata University 97 ( 2014-I ) 25 - 44 2014.9
The Transfer Paradox in the Harris and Todaro Model
Kojun HAMADA
The Journal of Economics, Niigata University 96 ( 2013-II ) 29 - 47 2014.3
Rational Recognition of Habit Formation and the Transfer Paradox in a Two Period Model
Kojun HAMADA
The Journal of Economics, Niigata University 95 ( 2013-I ) 13 - 35 2013.9
A Numerical Approach to the Contract Theory: the Case of Moral Hazard Problem
Hideo HASHIMOTO, Kojun HAMADA, Nobuhiro HOSOE
The Journal of Economics, Niigata University 94 ( 2012-II ) 99 - 135 2013.3
A Numerical Approach to Contract Theory: the Case of Adverse Selection Problem
Hideo HASHIMOTO, Kojun HAMADA, Nobuhiro HOSOE
The Journal of Economics, Niigata University 93 ( 2012-I ) 91 - 135 2012.10
Uncertainty and Horizontal Mergers Reviewed
Kojun Hamada
JOURNAL OF INSTITUTIONAL AND THEORETICAL ECONOMICS-ZEITSCHRIFT FUR DIE GESAMTE STAATSWISSENSCHAFT 168 ( 2 ) 252 - 265 2012.6
THE BENEFIT OF REDUCED COMPETITION AND THE COST OF INFORMATION RENT UNDER OUTSOURCING Reviewed
Kojun Hamada
BULLETIN OF ECONOMIC RESEARCH 64 ( 2 ) 209 - 225 2012.4
Altruism and the Transfer Paradox Reviewed
Kojun HAMADA
The International Economy 15 ( 15 ) 96 - 105 2012.4
The Timing of Trade Policy Implementation in a Third Market Model
Kojun HAMADA
The Journal of Economics, Niigata University 92 ( 2011-II ) 1 - 23 2012.3
Optimal Subsidy and Tariff in a Two-country Model
Kojun HAMADA
The Journal of Economics, Niigata University 91 ( 2011-I ) 51 - 68 2011.9
Competition Policy and Merger Regulation: Protecting Consumers and Promoting Mergers
Kojun HAMADA, Yasuhiro TAKARADA
The Nanzan Journal of Economics Studies 26 ( 1 ) 1 - 21 2011.6
A Survey of the Screening Role of Merger Control
Kojun HAMADA
The Journal of Economics, Niigata University 90 ( 2010-II ) 19 - 49 2011.3
Outsourcing versus In-house Production: The Case of Product Differentiation with Cost Uncertainty Reviewed
Kojun HAMADA
Seoul Journal of Economics 23 ( 4 ) 439 - 459 2010.12
Uncertainty and Expected Profits under Cournot Competition
Kojun HAMADA
The Journal of Economics, Niigata University 89 ( 2010-I ) 15 - 51 2010.9
Kojun HAMADA
The Journal of Economics, Niigata University 88 ( 2009-II ) 33 - 50 2010.3
Kojun HAMADA
The Journal of Economics, Niigata University 87 ( 2009-I ) 1 - 42 2009.9
Second-mover Advantage under Strategic Subsidy Policy in a Third Market Model Reviewed
Kojun HAMADA
Economics Bulletin 29 ( 1 ) 408 - 416 2009.3
A Note on Profitable Mergers in a Hierarchical Stackelberg Model
Kojun HAMADA
The Journal of Economics, Niigata University 86 ( 2008-II ) 1 - 18 2009.3
Kojun HAMADA, Yasuhiro TAKARADA
Annual Report of Economics, Niigata University 33 ( 33 ) 15 - 38 2009.1
Kojun HAMADA
The Journal of Economics, Niigata University 85 ( 2008-I ) 77 - 91 2008.9
Kojun HAMADA
The Journal of Economics, Niigata University 84 ( 2007-II ) 19 - 44 2008.3
Donor Enrichment Can Never Occur When the Recipient Imposes a Tariff in a Two-country Model
Kojun HAMADA
Annual Report of Economics, Niigata University 32 1 - 11 2008.2
Kojun HAMADA
The Journal of Economics, Niigata University 83 ( 2007-I ) 1 - 23 2007.9
Merger Analysis in the Generalized Hierarchical Stackelberg Model
Kojun HAMADA, Yasuhiro TAKARADA
Nanzan Journal of Economic Studies 21 ( 3 ) 159 - 170 2007.3
Kojun HAMADA
The Journal of Economics, Niigata University 82 ( 2006-II ) 13 - 55 2007.3
Profitable Mergers in Cournot and Stackelberg Markets: 80 Percent Share Rule Revisited
Kojun HAMADA, Yasuhiro TAKARADA
Annual Report of Economics, Niigata University 31 153 - 160 2007.2
International M&A and Asymmetric Information on Market Demand
Kojun HAMADA
International Public Policy Studies 11 ( 1 ) 103 - 118 2006.9
A Technical Note on Trade Policy and the Number of Firms in the Third-country Market
Kojun HAMADA
The Journal of Economics, Niigata University 81 ( 2006-I ) 1 - 30 2006.9
Observation of Common Retail Cost under Exclusive Dealing Reviewed
Kojun HAMADA
Seoul Journal of Economics 18 ( 1 (Spring) ) 1 - 19 2005.5
Cost Difference and the Choice of Distributional Channel by Manufacturers
Kojun HAMADA
The Journal of Economics, Niigata University 73 ( 2002-I ) 1 - 16 2002.9
The Effects of Cost Difference between Distributors under Duopolistic Competition : Part II
Kojun HAMADA
The Journal of Economics, Niigata University 71 ( 2001-I ) 45 - 61 2001.9
A Contribution to the Theory of Vertical Structure
Kojun Hamada
Doctoral Dissertation Paper (Graduate School of Economics, Osaka University) 16429 1 - 197 2001.5
The Effects of Cost Difference between Distributors under Duopolistic Competition
Kojun HAMADA
The Journal of Economics, Niigata University 70 ( 2000-II ) 109 - 144 2001.3
Kojun HAMADA
The Economic Review of Osaka University 49 ( 1 ) 109 - 128 1999.10
Optimal Contracts when Reservation Payoffs Depend on the Agent's Type
Kojun HAMADA
The Economic Review of Osaka University 48 ( 3・4 ) 315 - 329 1999.3
To Integrate or Not: the Choice of Trading Organizations under Duopolistic Competition
Kojun HAMADA
The Economic Review of Osaka University 48 ( 2 ) 157 - 173 1998.12
Welfare, Growth, and Intergenerational Impact: Economic Analysis in an Overlapping Generations Model
Kojun HAMADA, Akihiko KANEKO, Mitsuyoshi YANAGIHARA（ Role： Joint author , All）
Niigata University Scholars Series 2023.2 （ ISBN:9784902140231 ）
Advances in Local Public Economics: Theoretical and Empirical Studies
Kojun HAMADA, Yoshitomo OGAWA, Mitsuyoshi YANAGIHARA（ Role： Contributor , Chapter 4 Subsidy Competition Between Regions: An Extension to Cross-shareholding and Employment Concerns）
Springer 2019.3 （ ISBN:9789811331077 ）
The International Transfer Problem: An Essay on the Transfer Paradox and Intergenerational Allocation
Kojun HAMADA, Mitsuyoshi YANAGIHARA（ Role： Joint author , All）
Niigata University Scholars Series 2019.2 （ ISBN:9784902140217 ）
Economic Challenges Facing Japan’s Regional Areas (in Japanese)
Kojun HAMADA（ Role： Contributor , Chapter 2, Fisheries policy, Discussion 1, An Economic Analysis of the Introduction of Individual Quote (IQ) System）
Jiji Press Publishing Bureau 2018.9 （ ISBN:9784788715837 ）
Economic Challenges Facing Japan’s Regional Areas
Kojun HAMADA（ Role： Contributor , Introduction of an Individual Quota (IQ) System to Japan’s Fishing Industry: An Economic Analysis (pp.39-49)）
Palgrave Pivot 2018.2 （ ISBN:9789811071102 ）
Competition Between Public and Private Firms: An Essay on the Theory of Mixed Oligopoly
Kojun HAMADA（ Role： Sole author , All）
Niigata University Scholars Series 2018.1 （ ISBN:9784902140194 ）
Public Economics Research VI (Research Series by Institute of Economics attached to Faculty of Economics, Chukyo University) (Eds. Masatoshi Shirai, Kimiyoshi Kamada, and Akiyoshi Furukawa)
Kojun HAMADA（ Role： Contributor , Chapter 4, Intergenerational Income Redistribution and the Transfer Problem: How Does Domestic Income Distribution Affect the Welfare Effect of International Aid? (Written by Akihiko Kaneko, Kojun Hamada, and Mitsuyoshi Yanagihara)）
Keiso Shobo 2017.3 （ ISBN:9784326549740 ）
The Theory of Mixed Oligopoly: Privatization, Transboundary Activities, and Their Applications (Eds. Mitsuyoshi Yanagihara and Minoru Kunizaki)
Kojun HAMADA（ Role： Contributor , Chapter 3 Privatization in a Stackelberg Mixed Oligopoly; Chapter 7 Privatization Neutrality Theorem When a Public Firm Maximizes Objectives Other than Social Welfare）
Springer 2016.10 （ ISBN:9784431556329 ）
Equilibrium Theory for Cournot Oligopolies and Related Games: Essays in Honour of Koji Okuguchi，(Eds. Pierre von Mouche and Federico Quartieri)
Kojun HAMADA（ Role： Contributor , Privatization Neutrality Theorem and Discriminatory Subsidy Policy）
Springer 2016.5 （ ISBN:9783319292540 ）
The Essentials of Microeconomics
Shinsuke KAMBE, Yasuhiro TAKARADA, Kojun HAMADA（ Role： Joint author）
Yuhikaku 2006.12 （ ISBN:9784641177000 ）
Economics of Incentive Design (Eds. Hideshi Itoh and Hiroshi Osano)
Kojun HAMADA（ Role： Contributor , Ch. 6, Economic Analysis of Distribution: Sales Contracts and Vertical Trade Restricts）
Keisoshobo 2003.12 （ ISBN:9784326502431 ）
The Trend of Thought on Contemporary Accounting (Ed. Kosaku Hamada)
Kojun HAMADA（ Role： Contributor , Ch.9, A Survey on a Development of Agency Theory on Accounting）
Taga-shuppan 1999.11 （ ISBN:9784811555317 ）
Economy Classroom: How to Protect Marine Resources (the latter part); Give Fishermen Incentives to Prevent Overfishing: The Key is the Spread of the Individual Quota System (in Japanese) Invited
Kojun HAMADA
The Nikkei 25 - 25 2018.10
A Numerical Approach to the Contract Theory: the Case of Adverse Selection
HASHIMOTO Hideo, HAMADA Kojun, HOSOE Nobuhiro
GRIPS Discussion Papers 11 2012.3
橋本 日出男, 濱田 弘潤, 細江 宣裕
GRIPS Discussion Papers 10 2011.2
Privatization Versus Managerial Delegation Under Constant Marginal Cost
Kojun HAMADA, Hideya KATO
PET (Public Economic Theory) 2024 (presented by Hamada) 2024.6
Privatization Neutrality in Mixed Oligopoly with Externalities
Kojun HAMADA, Yasuhiro TAKARADA
PET (Public Economic Theory) 2025 (presented by Takarada) 2025.6
Commodity Tax Competition and Cross-border Shopping in a Tripoint Model International conference
Kojun HAMADA, Yoshitomo OGAWA
PET(Public Economic Theory) 2019 (presented by Hamada) 2019.7 APET (Association for Public Economic Theory)
Commodity Tax Competition and Cross-border Shopping in a Tripoint Model
Kojun HAMADA, Yoshitomo OGAWA
RoMacS Workshop V 2018.11
Commodity Tax Competition and Cross-border Shopping in a Tripoint Model
Kojun HAMADA, Yoshitomo OGAWA
56th Economic Theory and Policy Workshop (presented by Hamada) 2018.11
Subsidy Competition Between Regions: An Extension to Cross-shareholding and Employment Concerns
Kojun HAMADA, Yoshitomo OGAWA, Mitsuyoshi YANAGIHARA
The 55th Annual Meeting of the Japan Section of the RSAI (presented by Hamada) 2018.10
Firms’ Location Choices and Tax Competition in a Third-market Model International conference
Kojun HAMADA, Yoshitomo OGAWA, Mitsuyoshi YANAGIHARA
PET(Public Economic Theory) 2018, APET (Association for Public Economic Theory) (presented by Hamada) 2018.6
Population Growth and the Transfer Paradox in an Overlapping Generations Model International conference
Kojun HAMADA, Tsuyoshi SHINOZAKI, Mitsuyoshi YANAGIHARA
PRSCO 2017, 25th Pacific Conference of the RSAI (Regional Science Association International) (presented by Yanagihara) 2017.5
Domestic Income Transfer and Workers' Welfare in a Dual Economy International conference
Makoto TAWADA, Ling QI, Kojun HAMADA
PRSCO 2017, 25th Pacific Conference of the RSAI (Regional Science Association International) (presented by Tawada) 2017.5
Lobbying to Landowners Accelerates the Great Divergence International conference
Tsuyoshi SHINOZAKI, Akihiko KANEKO, Kojun HAMADA, MITSUYOSHI Yanagihara
PRSCO 2017, 25th Pacific Conference of the RSAI (Regional Science Association International) (presented by Shinozaki) 2017.5
Privatization Neutrality Theorem When a Public Firm Maximizes Objectives Other than Social Welfare
Kojun HAMADA
The 53rd Annual Meeting of the Japan Section of the RSAI 2016.10
Lobbying to Landowners Accelerates the Great Divergence International conference
SHINOZAKI Tsuyoshi, KANEKO Akihiko, HAMADA Kojun, YANAGIHARA Mitsuyoshi
China Meeting of Econometric Society 2016 (presented by Shinozaki) 2016.6
The Privatization Neutrality Theorem When a Public Firm Has a Different Objective from Welfare Maximization
Kojun HAMADA
41st NIESG conference 2015.3
Privatization Neutrality Theorem in Mixed Oligopoly with Firm Asymmetry
Kojun HAMADA
40th NIESG conference 2014.12
Population Growth and the Transfer Paradox in an Overlapping Generations Model International conference
Kojun HAMADA, Tsuyoshi SHINOZAKI, Mitsuyoshi YANAGIHARA
70th Annual Congress of the International Institute of Public Finance (presented by Yanagihara) 2014.8
The Transfer Paradox in a Pay-as-you-go Pension System International conference
Kojun HAMADA, Akihiko KANEKO, Mitsuyoshi YANAGIHARA
70th Annual Congress of the International Institute of Public Finance (presented by Yanagihara) 2014.8
Population Growth and the Transfer Paradox in an Overlapping Generations Model International conference
Kojun HAMADA, Tsuyoshi SHINOZAKI, Mitsuyoshi YANAGIHARA
2014 China Meeting of Econometric Society (presented by Shinozaki) 2014.6
The Transfer Paradox in a Pay-as-you-go Pension System International conference
Kojun HAMADA, Akihiko KANEKO, Mitsuyoshi YANAGIHARA
2014 China Meeting of Econometric Society (presented by Yanagihara) 2014.6
Donor Altruism and the Transfer Paradox in an Overlapping Generations Model International conference
Kojun HAMADA, Mitsuyoshi YANAGIHARA
69th Annual Conference of the International Institute of Public Finance (IIPF 2013) (presented by Yanagihara) 2013.8
Habit Formation and the Transfer Paradox in an Overlapping Generations Model
Kojun HAMADA
The 31st NIESG conference 2012.6
Altruism and the Transfer Paradox in an OLG Model
Kojun HAMADA
The 29th NIESG conference 2011.12
Incentive for Innovation and the Optimal Allocation of Patent
Kojun HAMADA
The Annual Spring Meeting of the Japanese Economic Association (in Kumamoto Gakuen University) 2011.5
Export-Subsidies and Timing of Decision-Making
Kojun HAMADA
The 64th Annual Meeting of the Japan Society of International Economics (in Ritsumeikan University) (in Japanese) 2005.10
Export-Subsidies and Timing of Decision-Making International conference
Kojun HAMADA
ETSG(European Trade Study Group) Conference 2005.9
Comparison between Exclusive Dealing and Common Agency under Asymmetric Information (in Japanese)
Kojun HAMADA
The Annual Autumn Meeting of the Japanese Economic Association (in Hitotsubashi University) 2001.10
The Effects of Cost Difference between Distributors under Duopolistic Competition (in Japanese)
Kojun HAMADA
The Annual Spring Meeting of the Japanese Economic Association (in Hiroshima Shu-do University) 2001.5
Informational Consolidation and Collusion on Optimal Contract Design to Multi-agent (in Japanese)
Kojun HAMADA
The Annual Autumn Meeting of the Japanese Economic Association (in Tokyo University) 1999.10
Vertical Integration and Market Competition (in Japanese)
Kojun HAMADA
The Western Conference of the Japanese Theoretical and Econometric Association (in Shiga University) 1997.5
2024 Niigata University Excellence Award
2024.7 Niigata University
Kojun Hamada
NOMURA Award
2023.3 Nikkei STOCK League
Kojun Hamada
2022 Niigata University Excellence Award
2022.11 Niigata Univeristy
Kojun Hamada
2021 Niigata University Excellence Award
2022.1 Niigata University
Kojun Hamada
The 7th Kiyoshi Kojima Award for Excellent Paper
2012.10 The Japan Society of International Economics (JSIE)
HAMADA Kojun
The Optimal Privatization Policy in a Mixed Oligopoly with Externalities
Grant number：2418
2025.1 - 2027.3
System name：Zengin Foundation for Studies on Economics and Finance Research Grant
Research category：Research Grant
Awarding organization：Zengin Foundation for Studies on Economics and Finance
Yasuhiro Takarada, Kojun Hamada
Authorship：Coinvestigator(s)
人口減少に対応するサステナブルな社会インフラ整備に関する理論研究
Grant number：23K01439
2023.4 - 2027.3
System name：科学研究費助成事業
Research category：基盤研究(C)
Awarding organization：日本学術振興会
篠崎 剛, 金子 昭彦, 濱田 弘潤, 柳原 光芳, 加藤 秀弥
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
A Theoretical Approach on the Impact of the Spread of AI on International Trade
Grant number：20K01629
2020.4 - 2024.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
Grant amount：\2600000 （ Direct Cost: \2000000 、 Indirect Cost：\600000 ）
A study of consistency of political systems and long-term economic growth
Grant number：19K01679
2019.4 - 2023.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
Grant amount：\4030000 （ Direct Cost: \3100000 、 Indirect Cost：\930000 ）
A Theoretical Study on International Economic Transfer Based on Behavioral Economics
Grant number：16K03615
2016.4 - 2021.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
Hamada Kojun
Grant amount：\2730000 （ Direct Cost: \2100000 、 Indirect Cost：\630000 ）
In this study, I theoretically examined how international economic transfer should be made between a donor and a recipient country using the trade theory and international economics based on the recent findings on behavioral economics. In particular, I considered the altruism, reciprocity, and habit formation of the people who live in a donor and/or recipient country as well as the cognitive bias on the effect of economic aids, and we investigated how we should make the international transfer and should increase the effectiveness of economic aid.
As a contribution of my study, we explored a model in which the citizens of donor and/or recipient countries have aspiration towards parents' lifestyle, and presented a result on how the degree of aspiration affects the effectiveness of international transfer.
Theoretical Analysis of Strategic Infrastructure Development for a Formation of High Quality Market in Global Economy
Grant number：16H03612
2016.4 - 2020.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (B)
Awarding organization：Japan Society for the Promotion of Science
Yanase Akihiko
Grant amount：\16510000 （ Direct Cost: \12700000 、 Indirect Cost：\3810000 ）
This research theoretically examined how to improve the physical infrastructure and the market infrastructure, which play a key role in the sound development and growth of the globalized modern economy, focusing on the interactions between the public and private sectors.
This research focuses on the following three topics: (1) strategic analysis of competition among countries regarding export and financing of physical infrastructure, (2) dynamic analysis of institutional transition and interaction between the mode of competition and trade structure, and (3) knowledge capital-based economic growth through educational investment and R&D under an open economy. By constructing the theoretical models regarding these topics and analyzing, this research derived new theoretical insights and policy implications for infrastructure development to form a "quality market" that achieves the sound development and growth of the global economy.
Dynamic Analysis of Foreign Aid with Consideration of Political Activity
Grant number：15K03449
2015.4 - 2018.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
SHINOZAKI Tsuyoshi
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
We scrutinized the effects of international foreign aid on welfares of donor and recipient countries in various economic environments. Firstly, we investigated how the effects of foreign aid on both countries'welfares are affected by intergenerational interdependency such as altruism and donor's sharing of burden and/or the recipient’s distribution of aid transfer. Secondly, we examined how a pay-as-you-go pension system affects the effects of foreign aid on both countries' welfares. In particular, our research succeeded in showing that international interdependency considered can trigger the possibility of the transfer paradox by improving the terms-of-trade of a donor country and/or deteriorating the terms-of-trade of a recipient. In addition, we clarified that political lobbying promotes economic growth of developing countries, which suggests that the appropriate design of political institution is required to prevent developing countries from falling into a poverty trap.
A Study on the Reform of Merger Control to Enhance International Competitiveness of Japanese Companies
Grant number：25380286
2013.4 - 2016.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
Hamada Kojun
Grant amount：\2470000 （ Direct Cost: \1900000 、 Indirect Cost：\570000 ）
(1) We have examined the impact that a merger between a public firm and a private firm has on social welfare in a mixed oligopolistic market. We have simulated the comparison of social welfare before and after the merger between a public firm and a private firm to investigate whether the merger improves social welfare by specifying the functional forms of cost function.
(2) We have investigated the neutrality theorem on whether welfare is exactly the same before and after merging. We have shown that when regulating authorities can implement the appropriate subsidy policies to regulated firms, the privatization neutrality theorem can be satisfied in a broader economic environment. (3) We have analyzed the international harmonization of regulations. We have clarified that even if a country cares about other countries, income transfer from a transferor inhibits capital accumulation and the social welfare of the transferor is less likely to improve.
Economic Analysis of the Fisheries Policies for Restoration after the Tohoku Great Earth Quake and Tsunami
Grant number：24580317
2012.4 - 2015.3
System name：Grants-in-Aid for Scientific Research
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
KOMATSU Masayuki, HOSOE Nobuhiro, HAMADA Kojun, TAKARADA Yasuhiro
Grant amount：\5460000 （ Direct Cost: \4200000 、 Indirect Cost：\1260000 ）
The Tohoku Great Earth quake and reform of Fishery Right of Japan - Japan’s system of Fishery Right for fishing in the coastal water is very unique one, dating back to the Feudal Era, This system is closed nature and excludes any individuals and corporations to newly engage in the fisheries. 2011 Earth quake a was a good opportunity for reforms.The attempt was made to enact the special law. This study was to analyses the merit of the reform of fisheries right from the economic views viewpoint.
The Japan’ s Fisheries Managemant reform - Japan’s Fisheries Management is based upon the input control and human communication Output control. of Fisheries Management involves Individual Quota (IQ・ITQ) The study focused on the merit demerit and implementability of the Model Case of Niigata Prefecture Fisheries in ecomnomic aspects in comparison to those in foreign nations’s systems.
寡占理論を用いたM&Aの経済効果に関する研究
Grant number：16730095
2004 - 2005
System name：科学研究費助成事業
Research category：若手研究(B)
Awarding organization：日本学術振興会
濱田 弘潤
Grant amount：\2200000 （ Direct Cost: \2200000 ）
1.経営者による合併の近視眼的な決定に関する動学的研究
(1)合併の戦略的意思決定行動の分析
国際貿易のフレームワークに寡占理論を適用し,外国企業による国内企業の買収問題を考察する理論モデルを構築し分析を行った.買収企業と被買収企業との間に,買収後も情報の非対称性が存在する場合,企業買収が戦略的に望ましいかどうかについて分析を行った.買収企業と被買収企業どの間に利害の不一致が存在する状況を,プリンシパル・エージェンシー理論を用いて分析し,たとえ非対称情報取得のコストが掛かるとしても,合併が望ましく,競争緩和によるメリットが情報レントを上回ることを示した.この成果を"International M & A and Asymmetric Information on Market Demand"というタイトルの論文にまとめ,『国際公共政策研究』(第11巻第1号)に投稿・掲載予定とした.
(2)標準的な寡占理論における合併の利益分析
標準的な寡占理論を再考し,あまり議論されていない一般的な多段階シュタッケルベルク数量競争のモデルを用いて,合併利益についての論文を執筆した.シュタッケルベルク均衡において,数量選択の意思決定タイミングが多段階で異なる状況で,同時手番と逐次手番の企業の合併利益とその相対的大小関係について調査を行った。この成果は,論文"Mergers under the Generalized Hierarchical Stackelberg Model"というタイトルの論文として,Niigata University Working Paper No.46にまとめた.
(3)販売網の再編から見た情報取得の選択の分析
企業が製品を販売する際に,販売市場に関する情報を収集すべきかどうかについて,販売網再編の観点から分析を行った.情報取得に費用が掛かるにもかかわらず,寡占市場の下では過剰な情報収集競争が起こるとする結論を示し,"Observation of Common Retail Cost under Exclusive Dealing"というタイトルの論文にまとめ,Seoul Journal of Economics, Vol.18(1)に発表した.
2.M&Aの株式の取得過程に関する研究
ファイナンス手法の観点からのM&Aに関する企業戦略の解明と,株式取得のtakeover bidのオークション理論によるモデル化について,オークション理論を踏まえたtakeoverの理論モデルを構築したが,計画期間中に有益な結論を得るには至らなかった.
現代日本の経済システムと制度の比較分析-企業間取引とコーポレート・ガバナンス
Grant number：98J00948
1998 - 1999
System name：科学研究費助成事業
Research category：特別研究員奨励費
Awarding organization：日本学術振興会
濱田 弘潤
Grant amount：\1800000 （ Direct Cost: \1800000 ）
産業組織論
Grant type：Competitive
Theory of Industrial Organization
Grant type：Competitive
演習 III
演習 IV
経済学入門
演習I
演習II
スタディスキルズII
スタディスキルズIII
組織の経済学特論
組織の経済学演習
卒業論文
応用ミクロ経済学研究
入門ミクロ経済学
応用ミクロ経済分析
スタディスキルズⅠ
産業組織論Ⅰ
スタディスキルズⅡ
産業組織論Ⅱ
演習ⅠA(濱田弘潤)
卒業論文(濱田弘潤)
演習ⅡA(濱田弘潤)
演習ⅡB(濱田弘潤)
演習ⅠB(濱田弘潤)
文献研究ⅠB
文献研究ⅡB
現代マネジメント総合演習
応用ミクロ経済学研究
経済経営総合演習
スタディスキルズ(経営学科)
演習ⅡB
演習ⅡA
文献研究ⅠA
文献研究ⅡA
入門ミクロ経済学
演習ⅠB
演習ⅠA
経済学要論
組織の経済学Ⅰ
組織の経済学Ⅱ
応用ミクロ経済分析
ミクロ経済分析特論
ミクロ経済分析演習
特定研究Ⅲ
課題研究Ⅲ
課題研究Ⅱ
特定研究Ⅰ
課題研究Ⅰ
特定研究Ⅱ
演習Ⅲ
演習Ⅱ
ミクロ経済学基礎
演習Ⅰ
組織の経済学I
組織の経済学
卒業論文
ミクロ経済学入門
公共経営特殊講義
ミクロ経済学II演習
日経新聞から見た経済
演習II
演習I
企業経済学
ミクロ経済学II特論
組織の経済学II
演習III
