Updated on 2023/02/05

写真a

 
HAMADA, Kojun
 
Organization
Academic Assembly Institute of Humanities and Social Sciences KEIZAIGAKU KEIRETU Professor
Faculty of Economic Sciences Department of Interdisciplinary Economic Studies Professor
Title
Professor
Other name(s)
handle0054731
External link

Degree

  • 博士(経済学) ( 2001.5   大阪大学 )

  • 修士(経済学) ( 1997.3   大阪大学 )

Research Interests

  • Theory of Industrial Organization

  • International Economics

Research Areas

  • Humanities & Social Sciences / Economic theory

  • Humanities & Social Sciences / Economic policy  / Theory of Industrial Organization

Research History (researchmap)

  • Niigata University   Faculty of Economic Sciences   Professor

    2021.4

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    Country:Japan

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  • Niigata University   Faculty of Economic Sciences   Associate Professor

    2020.4 - 2021.3

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    Country:Japan

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  • Niigata University   Faculy of Economics   Associate Professor

    2001.4 - 2020.3

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    Country:Japan

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  • Niigata University   Faculty of Economics   Lecturer

    2000.4 - 2001.3

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    Country:Japan

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Research History

  • 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 Multisocial Studies   Associate Professor

    2012.4 - 2020.3

  • Niigata University   Graduate School of Modern Society and Culture Economics and Management   Associate Professor

    2012.4 - 2020.3

  • Niigata University   Faculty of Economics Department of Business Administration   Associate Professor

    2001.4 - 2020.3

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Education

  • Osaka University   Graduate School of Economics   Doctoral Course

    1997.4 - 2000.3

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  • Osaka University   Graduate School of Economics   Master Course

    1995.4 - 1997.3

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  • Osaka University   Faculty of Economics   Department of Economics

    1991.4 - 1995.3

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Professional Memberships

  • JAPANESE ECONOMIC ASSOCIATION

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  • THE JAPAN SOCIETY OF INTERNATIONAL ECONOMICS

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Papers

  • 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

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

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  • A Duopoly of Strategic CSR Firms Reviewed

    Kojun Hamada

    Journal of Institutional and Theoretical Economics   178 ( 3 )   258 - 279   2022.9

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Mohr Siebeck  

    DOI: 10.1628/jite-2022-0012

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  • 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

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    DOI: 10.1111/caje.12598

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  • 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

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    We investigate how fertility decline affects the benefit of a pay-as-you-go pension using a two-sector overlapping generations model. We show that whether fertility decline reduces pension benefits is determined by the capital intensity ranking between the two sectors. When the consumption-goods sector is capital-intensive, fertility decline decreases pension benefits. Contrastingly, when the investment-goods sector is capital-intensive, the size of the price elasticity determines whether fertility decline reduces pension benefits. When elasticity is sensitive, fertility declines increase pension benefits. We also present numerical simulations. Our results suggest that, although it remains theoretically possible that fertility decline increases pension benefits, such a paradoxical result is unlikely to occur.

    DOI: 10.1111/meca.12371

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/meca.12371

  • Commodity Tax Competition and Cross-border Shopping in a Tripoint Model Reviewed

    Kojun Hamada

    Asia-Pacific Journal of Regional Science   1 - 26   2022.3

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s41685-022-00235-w

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    Other Link: https://link.springer.com/article/10.1007/s41685-022-00235-w/fulltext.html

  • 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

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  • 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

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/apce.12292

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/apce.12292

  • Mixed Duopoly in Price Competition Under the Optimal Privatization Rate Reviewed

    Kojun Hamada

    Economics Bulletin   41 ( 3 )   1282 - 1291   2021.9

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  • 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

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

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  • Location Tax/Subsidy Competition: When Governments Set Their Policies After Firms Choose Their Locations Reviewed

    Kojun Hamada, Yoshitomo Ogawa, Mitsuyoshi Yanagihara

    International Economic Journal   35 ( 3 )   323 - 343   2021.5

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/10168737.2021.1928265

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  • 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

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  • Generalization of Strategic Delegation Reviewed

    Kojun Hamada

    Japanese Economic Review   2021.1

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s42973-020-00070-8

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    Other Link: http://link.springer.com/article/10.1007/s42973-020-00070-8/fulltext.html

  • 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

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  • 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

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/boer.12240

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/boer.12240

  • 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

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  • Mixed Duopoly in Quantity Competition under the Optimal Privatization Rate Reviewed

    Kojun HAMADA

    Economics Bulletin   40 ( 1 )   689 - 698   2020.3

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  • 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

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  • Revised Fishery Act and Individual Quota (IQ) System Invited

    Kojun HAMADA

    Gakushikai Kaiho   937 ( 2019-IV )   49 - 54   2019.7

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  • Optimal Discriminatory Subsidy in Mixed Oligopoly with Subsidy Distortion

    Kojun HAMADA

    The Journal of Economics, Niigata University   106 ( 2018-II )   1 - 17   2019.3

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  • 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

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    DOI: 10.1111/rode.12541

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  • Merger Control under Asymmetric Information

    Kojun HAMADA

    The Journal of Economics, Niigata University   105 ( 2018-I )   1 - 18   2018.9

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  • 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

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley-Blackwell Publishing Ltd  

    This study is a theoretical examination of whether employee-controlled firms (ECFs) enter a free-entry oligopolistic market excessively or insufficiently, from the viewpoint of welfare maximization. The excess entry theorem is well known in oligopoly theory. According to this theorem, a greater number of profit-maximizing firms enter a free-entry oligopolistic market than is optimal for welfare maximization. We demonstrate the possibility that insufficient entry arises when ECFs compete in a free-entry market. In particular, we show that if both the demand and cost functions are convex, insufficient ECF entry necessarily occurs. Our results suggest that competition among firms seeking purposes other than profit might lead to insufficient entry because differences in competing firms’ objectives affect the intensity of market competition.

    DOI: 10.1111/apce.12179

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  • Privatization Neutrality Theorem: When a Public Firm Pursues General Objectives Reviewed

    Kojun Hamada

    Japanese Economic Review   69 ( 1 )   59 - 68   2018.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Blackwell Publishing Ltd  

    This paper examines the privatization neutrality theorem when a public firm pursues general objectives other than welfare maximization. This theorem states that when the government gives firms optimal subsidies, welfare is exactly the same before and after privatization. However, we present a seemingly paradoxical result. When a public firm incorrectly assumes that subsidies change the welfare size, privatization is necessarily welfare neutral, whereas when the public firm correctly recognizes that subsidies only bring about income redistribution, without affecting welfare, the situations in which neutrality holds are limited.

    DOI: 10.1111/jere.12143

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  • 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

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  • Oligopolistic competition in the banking market and economic growth Reviewed

    Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara

    Economic Modelling   68   239 - 248   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    We investigate how banks’ degree of imperfect competition affects economic growth. This study explores an imperfect competition model in banking in an overlapping generations model with endogenous growth. We demonstrate the following results. First, an increase in the deposit interest rate increases the steady growth rate of the economy. Second, as competition among banks intensifies, the economic growth rate increases. Third, it is ambiguous as to whether a higher lending interest rate caused by an increase in productivity results in a higher economic growth rate. In our numerical exercises, we exemplify the possibility that an increase in the lending interest rate increases the growth rate.

    DOI: 10.1016/j.econmod.2017.07.017

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  • 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

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    This study examines the transfer problem between two countries when either the donor or the recipient has aspirations, based on parents' standards of living, in a one-sector overlapping generations model. Focusing on whether and how aspirations impact the welfare effect of a transfer, we demonstrate the following results. First, when the donor forms aspirations, as the degree of his/her aspirations to their parents increases, a transfer is more likely to cause donor enrichment. However, this does not affect the recipient's welfare at all. In contrast, when the recipient forms aspirations, whether the increase in the degree of these aspirations causes immiserization depends on whether the transfer raises the recipient's consumption. Second, we show that if the donor's or recipient's marginal utility increases with their respective aspirations, the transfer is more likely to cause recipient immiserization. However, whether donor enrichment occurs depends on the situation. These results imply that there are two types of effects that aspirations can have on the welfare of both countries: effects caused by the aspirations, and effects that occur through the capital market. Furthermore, we find that these two effects on welfare do not necessarily work in the same direction.

    DOI: 10.1007/s00712-017-0537-5

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  • Incentive for innovation and the optimal allocation of patents Reviewed

    Kojun Hamada

    AUSTRALIAN JOURNAL OF MANAGEMENT   42 ( 4 )   692 - 707   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SAGE PUBLICATIONS LTD  

    This article theoretically investigates how different ownership structures of patents affect ex ante and ex post incentives for innovation by applying a property rights approach. We explore a model in which two research laboratories invest in R&D to obtain an innovative patent, and after successfully obtaining the patent they determine an ownership structure for the patent. The two parties consider how the determined patent ownership would affect their noncontractible relation-specific investments for commercialisation. We demonstrate that joint ownership of a patent between two parties is optimal. More concretely, if a selfish (altruistic) relation-specific investment is more important than an altruistic (selfish) investment, a joint ownership with no (bilateral) veto is optimal to maximise the joint value. Moreover, when both parties do not commit themselves to joint ownership in advance, they have greater incentive to invest in R&D than committing, even if they understand that joint ownership is desirable ex post.

    DOI: 10.1177/0312896216686152

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  • Advertising Competition in a Pure Oligopoly

    Kojun HAMADA

    The Journal of Economics, Niigata University   103 ( 2017-I )   19 - 40   2017.9

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  • 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

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    We examine how international transfers affect the welfare levels of a donor with a higher marginal propensity to save and a recipient with a lower marginal propensity to save when both countries adopt a pay-as-you-go (PAYG) pension system using a one-sector overlapping generations model. We demonstrate that in a dynamically efficient economy, except at the golden rule, when a per capita PAYG pension contribution of either a donor or a recipient increases marginally, the effect of the transfer on the donor’s welfare can be reduced, whereas whether the effect of the transfer on the recipient’s welfare is reduced is ambiguous. These results imply that the existence of a PAYG pension might hinder the effectiveness of the transfer on the donor’s welfare, and the adoption of a PAYG pension system is likely to cause a weak transfer paradox in which both a donor and a recipient immiserize. Our results also suggest that the introduction of a PAYG pension system, which is used as a domestic policy instrument for intergenerational income redistribution, reduces the donor’s incentive to make an international transfer to a recipient, which is a form of international income redistribution.

    DOI: 10.1007/s10368-016-0338-2

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  • Advertising Competition in a Mixed Oligopoly Revisited

    Kojun HAMADA

    The Journal of Economics, Niigata University   102 ( 2016-II )   11 - 35   2017.3

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    Other Link: http://hdl.handle.net/10191/47152

  • 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

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  • 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

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY  

    This paper revisits De Fraja and Delbono (1989), which is the seminal paper on mixed oligopoly, in order to pay more attention to Stackelberg competition. First, we show that, even in Cournot competition, if the number of private firms is sufficiently small, privatization necessarily reduces social welfare. Second, we demonstrate that when a public firm is a Stackelberg leader before and after privatization, privatization necessarily reduces welfare irrespective of the number of private firms. Moreover, we show that even when a public firm remains a follower, privatization reduces welfare if the number of private firms is relatively small.

    DOI: 10.1111/boer.12077

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  • Introduction of an Individual Quota (IQ) System in Japan's Fishing Industry: An Economic Analysis

    Kojun HAMADA

    SPACE NIRA   06 ( A )   2016.11

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  • 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

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Routledge  

    We investigate the transfer problem between two countries in the steady state in a one-sector overlapping generations model and explain how transfers should be shared between the young and old generations of the donor country and allocated across the generations of the recipient country. Except at the golden rule of capital accumulation, the ratios of the burden and distribution of transfers between the young and old generations affect welfare. We obtain the following results. First, the sharing of the transfer burden in the donor country depends on the relative size of two effects, namely, a negative direct effect and a positive indirect effect. If the former exceeds the latter, it is preferable for the donor country to allocate all of the transfer burden to the old generation and vice versa. Second, from the viewpoint of welfare maximization, it is preferable for the recipient country to distribute all of the transfers to the young generation. In contrast to the existing literature, these results suggest that the setting whereby the young generation of the donor country defrays all transfer costs may not be justifiable from the viewpoint of donor welfare maximization.

    DOI: 10.1080/10168737.2016.1204345

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  • 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

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

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    Other Link: http://hdl.handle.net/10191/43771

  • Privatization Neutrality Theorem in a Mixed Oligopoly with Firm Asymmetry Reviewed

    Kojun HAMADA

    Economics Bulletin   36 ( 1 )   395 - 400   2016.3

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  • 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

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    Other Link: http://hdl.handle.net/10191/40017

  • 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

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    This study investigates how intergenerational altruism affects the possibility of the transfer paradox occurring in a two-country, one-sector overlapping generations model. We derive the conditions under which the transfer paradox occurs in our model where a generation within each country has altruism toward the subsequent generation. Contrary to earlier results in the literature, we find that altruism does not enter the conditions under which the transfer paradox occurs in the steady state. Moreover, we show that although altruism affects the condition of the transfer paradox along the transition path, its effect on this condition vanishes as the economy converges to the steady state.

    DOI: 10.1016/j.qref.2015.04.001

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  • 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

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    Other Link: http://hdl.handle.net/10191/33353

  • Endogenous Timing in a Mixed Oligopoly Revisited

    Kojun HAMADA

    The Journal of Economics, Niigata University   98 ( 2014-II )   1 - 42   2015.3

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    Other Link: http://hdl.handle.net/10191/32291

  • 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

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    This paper examines the transfer problem between two countries when a donor exhibits altruistic utility toward a recipient in a one-sector overlapping generations model. We demonstrate that if the donor has a larger marginal propensity to save than the recipient, the donor's altruism never contributes to donor enrichment irrespective of the degree of the donor's altruism. Donor enrichment occurs only if the donor has a smaller marginal propensity to save and a sufficiently high level of altruism. These findings imply that the altruism of a donor toward a recipient does not necessarily explain the motivation to voluntarily provide a transfer.

    DOI: 10.1111/roie.12142

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  • Welfare Comparison before and after Privatization in Mixed Oligopoly: An Extension of Stackelberg Equilibrium

    Kojun HAMADA, LI Kunli

    The Journal of Economics, Niigata University   97 ( 2014-I )   25 - 44   2014.9

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    Other Link: http://hdl.handle.net/10191/29928

  • The Transfer Paradox in the Harris and Todaro Model

    Kojun HAMADA

    The Journal of Economics, Niigata University   96 ( 2013-II )   29 - 47   2014.3

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    Other Link: http://hdl.handle.net/10191/26715

  • 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

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    Other Link: http://hdl.handle.net/10191/23864

  • 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

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    Other Link: http://hdl.handle.net/10191/21727

  • 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

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  • Uncertainty and Horizontal Mergers Reviewed

    Kojun Hamada

    JOURNAL OF INSTITUTIONAL AND THEORETICAL ECONOMICS-ZEITSCHRIFT FUR DIE GESAMTE STAATSWISSENSCHAFT   168 ( 2 )   252 - 265   2012.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:J C B MOHR  

    We examine the effect of uncertainty on horizontal mergers, considering that firms must decide whether to merge before observing the realized cost of the merged firm. The existing literature clarifies that merging firms facing cost uncertainty decide to merge if expected efficiency gains or informational advantages are positive. We show that even in the absence of uncertain efficiency gains or losses in expected terms, as the variance of uncertainty grows, horizontal mergers generate larger expected profits than before the merger and improve consumer surplus and welfare in expected terms. Our findings suggest that increased uncertainty itself provides an incentive for firms to merge. (JEL: D43, L13, L22)

    DOI: 10.1628/093245612800933951

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  • 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

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    We analyse the cost and benefit of outsourcing with adverse selection in a duopoly by comparing outsourcing with in-house production in terms of the manufacturers expected profit. When two manufacturers faced with ex ante cost uncertainty compete in a differentiated duopoly, outsourcing brings about a benefit in terms of reduced competition, while it entails the cost of information rent. We show that the manufacturers always choose in-house production in Cournot and Bertrand competition, when outsourcing and in-house production follow the same ex ante cost distribution. When the manufacturers compete in Cournot fashion, the cost of information rent always exceeds the benefit of reduced competition under outsourcing. On the other hand, when they compete in Bertrand fashion, it is possible that even if the benefit of outsourcing exceeds the cost, both manufacturers cannot choose outsourcing.

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  • Altruism and the Transfer Paradox Reviewed

    Kojun HAMADA

    The International Economy   15   96 - 105   2012.4

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  • 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

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    Other Link: http://hdl.handle.net/10191/18225

  • Optimal Subsidy and Tariff in a Two-country Model

    Kojun HAMADA

    The Journal of Economics, Niigata University   91 ( 2011-I )   51 - 68   2011.9

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    Other Link: http://hdl.handle.net/10191/16927

  • 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

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  • A Survey of the Screening Role of Merger Control

    Kojun HAMADA

    The Journal of Economics, Niigata University   90 ( 2010-II )   19 - 49   2011.3

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    Other Link: http://hdl.handle.net/10191/16650

  • 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

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  • Uncertainty and Expected Profits under Cournot Competition

    Kojun HAMADA

    The Journal of Economics, Niigata University   89 ( 2010-I )   15 - 51   2010.9

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  • Effect of Import Tariffs on Foreign Export Subsidies and Countervailing Duties: An Extension of the Model of Wang (2004)

    Kojun HAMADA

    The Journal of Economics, Niigata University   88 ( 2009-II )   33 - 50   2010.3

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    Other Link: http://hdl.handle.net/10191/12634

  • Welfare Analysis of Oligopoly in Homogeneous Product Market, Part II: Entry Cost and the Divergence between Private and Social Marginal Costs

    Kojun HAMADA

    The Journal of Economics, Niigata University   87 ( 2009-I )   1 - 42   2009.9

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    Other Link: http://hdl.handle.net/10191/9592

  • Second-mover Advantage under Strategic Subsidy Policy in a Third Market Model Reviewed

    Kojun HAMADA

    Economics Bulletin   29 ( 1 )   408 - 416   2009.3

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  • 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

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    Other Link: http://hdl.handle.net/10191/7807

  • Horizontal Merger and Merger Remedies in Antitrust Law: A Unified Explanation of Regulatory Constraints under the Linear Demand (jointly worked)

    Kojun HAMADA, Yasuhiro TAKARADA

    Annual Report of Economics, Niigata University   33 ( 33 )   15 - 38   2009.1

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    Other Link: http://hdl.handle.net/10191/8412

  • An Analysis of Profitability of Conglomerate Firms: An Explanation of Conglomerate Discount by the Oligopoly Theory

    Kojun HAMADA

    The Journal of Economics, Niigata University   85 ( 2008-I )   77 - 91   2008.9

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    Other Link: http://hdl.handle.net/10191/6635

  • Welfare Analysis of Oligopoly in Homogeneous Product Market, Part I: A Study on the Divergence between Private and Social Marginal Costs

    Kojun HAMADA

    The Journal of Economics, Niigata University   84 ( 2007-II )   19 - 44   2008.3

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    Other Link: http://hdl.handle.net/10191/6624

  • 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

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  • Welfare Analysis of Monopolistic Market: A Study on the Divergence between Private and Social Marginal Costs

    Kojun HAMADA

    The Journal of Economics, Niigata University   83 ( 2007-I )   1 - 23   2007.9

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    Other Link: http://hdl.handle.net/10191/6145

  • Merger Analysis in the Generalized Hierarchical Stackelberg Model

    Kojun HAMADA, Yasuhiro TAKARADA

    Nanzan Journal of Economic Studies   21 ( 3 )   159 - 170   2007.3

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  • Export Subsidies and Timing of Decision-making: An Extension to the Sequential-move Game of Brander and Spencer (1985) Model

    Kojun HAMADA

    The Journal of Economics, Niigata University   82 ( 2006-II )   13 - 55   2007.3

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    Other Link: http://hdl.handle.net/10191/5148

  • 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

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    Other Link: http://hdl.handle.net/10191/5134

  • International M&A and Asymmetric Information on Market Demand

    Kojun HAMADA

    International Public Policy Studies   11 ( 1 )   103 - 118   2006.9

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  • 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

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    Other Link: http://hdl.handle.net/10191/5136

  • Observation of Common Retail Cost under Exclusive Dealing Reviewed

    Kojun HAMADA

    Seoul Journal of Economics   18 ( 1 (Spring) )   1 - 19   2005.5

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  • 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

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    Other Link: http://hdl.handle.net/10191/17024

  • 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

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    Other Link: http://hdl.handle.net/10191/17023

  • A Contribution to the Theory of Vertical Structure

    Kojun Hamada

    Doctoral Dissertation Paper (Graduate School of Economics, Osaka University)   16429   1 - 197   2001.5

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  • 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

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    Other Link: http://hdl.handle.net/10191/16990

  • Comparison between Informationally Consolidated Organization and Informationally Centralized Organization

    Kojun HAMADA

    The Economic Review of Osaka University   49 ( 1 )   109 - 128   1999.10

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  • 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

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  • 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

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Books

  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • The Essentials of Microeconomics

    Shinsuke KAMBE, Yasuhiro TAKARADA, Kojun HAMADA( Role: Joint author)

    Yuhikaku  2006.12  ( ISBN:9784641177000

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  • 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 

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  • 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 

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MISC

  • 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

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  • A Numerical Approach to the Contract Theory: the Case of Adverse Selection

    HASHIMOTO Hideo, HAMADA Kojun, HOSOE Nobuhiro

    GRIPS Discussion Papers   11   2012.3

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  • 契約理論: プログラミング・モデル・アプローチ

    橋本 日出男, 濱田 弘潤, 細江 宣裕

    GRIPS Discussion Papers   10   2011.2

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    経済学 / Economics本稿は、伊藤(2003, 第1章)の「部品調達問題」についての数値計算モデルを構築し、契約理論モデルの特性について数値例によって理解を深めようとするものである。前半では伊藤に従って2タイプと3タイプのケースを考察し、後半では理論モデルに導入された簡単化のための仮定を外した場合や、簡単化の仮定が成立する状況がどの程度起こりそうであるかについても検討する。さらに、数値計算モデルの優位性を生かして、タイプ数が非常に多い場合であってもモデルを容易に拡張・適用できることを示す。This is a study to develop and solve numerical models based on Itoh's (2003, Ch. 1) "Parts Supply Problems" for better understanding the contract theory. In the first part of this paper, by following Itoh (2003) we investigate 2- and 3-agent type cases; in the succeeding part, by using numerical examples, we examine how likely the simplifying assumptions often used in theoretical analysis are to hold. Finally, we demonstrate that we can extend these basic models to ones with a much larger number of agent types easily by exploiting the merit of our programming–model approach.http://www.grips.ac.jp/list/jp/facultyinfo/hosoe_nobuhiro/

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Presentations

  • 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)

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  • Commodity Tax Competition and Cross-border Shopping in a Tripoint Model

    Kojun HAMADA, Yoshitomo OGAWA

    RoMacS Workshop V  2018.11 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • The Privatization Neutrality Theorem When a Public Firm Has a Different Objective from Welfare Maximization

    Kojun HAMADA

    41st NIESG conference  2015.3 

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  • Privatization Neutrality Theorem in Mixed Oligopoly with Firm Asymmetry

    Kojun HAMADA

    40th NIESG conference  2014.12 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • 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 

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  • Habit Formation and the Transfer Paradox in an Overlapping Generations Model

    Kojun HAMADA

    The 31st NIESG conference  2012.6 

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  • Altruism and the Transfer Paradox in an OLG Model

    Kojun HAMADA

    The 29th NIESG conference  2011.12 

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  • 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 

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  • 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 

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  • Export-Subsidies and Timing of Decision-Making International conference

    Kojun HAMADA

    ETSG(European Trade Study Group) Conference  2005.9 

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  • 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 

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  • 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 

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  • 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 

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  • Vertical Integration and Market Competition (in Japanese)

    Kojun HAMADA

    The Western Conference of the Japanese Theoretical and Econometric Association (in Shiga University)  1997.5 

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Awards

  • 2022 Niigata University Excellence Award

    2022.11   Niigata Univeristy  

    Kojun Hamada

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  • 2021 Niigata University Excellence Award

    2022.1   Niigata University  

    Kojun Hamada

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  • The 7th Kiyoshi Kojima Award for Excellent Paper

    2012.10   The Japan Society of International Economics (JSIE)  

    HAMADA Kojun

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Research Projects

  • 産業組織論

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  • Theory of Industrial Organization

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Teaching Experience

  • スタディスキルズII

    2022
    Institution name:新潟大学

  • 演習I

    2022
    Institution name:新潟大学

  • 演習II

    2022
    Institution name:新潟大学

  • スタディスキルズIII

    2022
    Institution name:新潟大学

  • 組織の経済学特論

    2021
    Institution name:新潟大学

  • 組織の経済学演習

    2021
    Institution name:新潟大学

  • 卒業論文

    2021
    Institution name:新潟大学

  • 応用ミクロ経済学研究

    2021
    Institution name:新潟大学

  • 入門ミクロ経済学

    2021
    Institution name:新潟大学

  • 応用ミクロ経済分析

    2021
    Institution name:新潟大学

  • スタディスキルズⅠ

    2020
    Institution name:新潟大学

  • 産業組織論Ⅰ

    2020
    Institution name:新潟大学

  • スタディスキルズⅡ

    2020
    Institution name:新潟大学

  • 産業組織論Ⅱ

    2018
    Institution name:新潟大学

  • 演習ⅠA(濱田弘潤)

    2014
    -
    2016
    Institution name:新潟大学

  • 卒業論文(濱田弘潤)

    2014
    -
    2016
    Institution name:新潟大学

  • 演習ⅡA(濱田弘潤)

    2014
    -
    2016
    Institution name:新潟大学

  • 演習ⅡB(濱田弘潤)

    2014
    -
    2015
    Institution name:新潟大学

  • 演習ⅠB(濱田弘潤)

    2014
    -
    2015
    Institution name:新潟大学

  • 文献研究ⅠB

    2014
    Institution name:新潟大学

  • 文献研究ⅡB

    2014
    Institution name:新潟大学

  • 現代マネジメント総合演習

    2013
    -
    2014
    Institution name:新潟大学

  • 応用ミクロ経済学研究

    2013
    -
    2014
    Institution name:新潟大学

  • 経済経営総合演習

    2013
    Institution name:新潟大学

  • スタディスキルズ(経営学科)

    2011
    -
    2018
    Institution name:新潟大学

  • 演習ⅡB

    2010
    -
    2021
    Institution name:新潟大学

  • 演習ⅡA

    2010
    -
    2021
    Institution name:新潟大学

  • 文献研究ⅠA

    2010
    -
    2016
    Institution name:新潟大学

  • 文献研究ⅡA

    2010
    -
    2016
    Institution name:新潟大学

  • 演習ⅠB

    2009
    -
    2020
    Institution name:新潟大学

  • 演習ⅠA

    2009
    -
    2020
    Institution name:新潟大学

  • 入門ミクロ経済学

    2009
    -
    2017
    Institution name:新潟大学

  • 経済学要論

    2009
    Institution name:新潟大学

  • 組織の経済学Ⅰ

    2008
    Institution name:新潟大学

  • 組織の経済学Ⅱ

    2008
    Institution name:新潟大学

  • 応用ミクロ経済分析

    2008
    -
    2021
    Institution name:新潟大学

  • ミクロ経済分析特論

    2008
    -
    2020
    Institution name:新潟大学

  • ミクロ経済分析演習

    2008
    -
    2018
    Institution name:新潟大学

  • 特定研究Ⅲ

    2008
    -
    2014
    Institution name:新潟大学

  • 課題研究Ⅲ

    2008
    -
    2014
    Institution name:新潟大学

  • 課題研究Ⅱ

    2008
    -
    2014
    Institution name:新潟大学

  • 特定研究Ⅰ

    2008
    -
    2014
    Institution name:新潟大学

  • 課題研究Ⅰ

    2008
    -
    2014
    Institution name:新潟大学

  • 特定研究Ⅱ

    2008
    -
    2014
    Institution name:新潟大学

  • 演習Ⅲ

    2008
    -
    2009
    Institution name:新潟大学

  • 演習Ⅱ

    2008
    -
    2009
    Institution name:新潟大学

  • ミクロ経済学基礎

    2008
    -
    2009
    Institution name:新潟大学

  • 演習Ⅰ

    2008
    Institution name:新潟大学

  • 組織の経済学I

    2007
    Institution name:新潟大学

  • 組織の経済学

    2007
    Institution name:新潟大学

  • 卒業論文

    2007
    -
    2018
    Institution name:新潟大学

  • ミクロ経済学入門

    2007
    -
    2015
    Institution name:新潟大学

  • 公共経営特殊講義

    2007
    -
    2012
    Institution name:新潟大学

  • 演習I

    2007
    Institution name:新潟大学

  • 日経新聞から見た経済

    2007
    Institution name:新潟大学

  • 演習II

    2007
    Institution name:新潟大学

  • ミクロ経済学II演習

    2007
    Institution name:新潟大学

  • 演習III

    2007
    Institution name:新潟大学

  • 企業経済学

    2007
    Institution name:新潟大学

  • ミクロ経済学II特論

    2007
    Institution name:新潟大学

  • 組織の経済学II

    2007
    Institution name:新潟大学

▶ display all