研究者詳細 - 濱田　弘潤

論文 - 濱田　弘潤

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Generalization of Strategic Delegation 査読

濱田弘潤

Japanese Economic Review 74 199 - 214 2021年1月

民営化と最適差別化補助金：補助金に歪みのある混合複占市場

濱田弘潤

新潟大学経済論集 109 ( 2020-I ) 49 - 76 2020年9月

Cooperative Managerial Delegation Revisited: Including the Firm's Cost as a Managerial Objective 査読

濱田弘潤

Bulletin of Economic Research 73 ( 2 ) 171 - 178 2020年6月

賦課方式年金財源に関する一考察：所得税から消費税へ

濱田弘潤

新潟大学経済論集 108 ( 2019-II ) 1 - 21 2020年3月

Mixed Duopoly in Quantity Competition under the Optimal Privatization Rate 査読

濱田弘潤

Economics Bulletin 40 ( 1 ) 689 - 698 2020年3月

費用格差のある複占企業への最適差別化補助金：補助金政策に歪みのある場合

濱田弘潤

新潟大学経済論集 107 ( 2019-I ) 23 - 36 2019年9月

改正漁業法と個別漁獲割当(IQ)制度の意義招待

濱田弘潤

學士會会報 937 ( 2019-IV ) 49 - 54 2019年7月

補助金政策に歪みのある混合寡占市場での最適差別化補助金

濱田弘潤

新潟大学経済論集 106 ( 2018-II ) 1 - 17 2019年3月

Population Growth and the Transfer Paradox in an Overlapping Generations Model 査読

濱田弘潤, 篠崎剛, 柳原光芳

Review of Development Economics 23 ( 1 ) 331 - 347 2019年2月

情報の非対称性下の企業結合規制

濱田弘潤

新潟大学経済論集 105 ( 2018-I ) 1 - 18 2018年9月

INSUFFICIENT ENTRY OF EMPLOYEE-CONTROLLED FIRMS IN A FREE-ENTRY OLIGOPOLY 査読

Kojun Hamada, Takao Ohkawa, Makoto Okamura

Annals of Public and Cooperative Economics 89 ( 2 ) 437 - 448 2018年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 査読

Kojun Hamada

Japanese Economic Review 69 ( 1 ) 59 - 68 2018年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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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民営化と広告投資：混合寡占市場と純粋寡占市場における広告競争の比較分析

濱田弘潤

新潟大学経済論集 104 ( 2017-II ) 1 - 40 2018年3月

Oligopolistic competition in the banking market and economic growth 査読

Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara

Economic Modelling 68 239 - 248 2018年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 査読

Kojun Hamada, Tsuyoshi Shinozaki, Mitsuyoshi Yanagihara

JOURNAL OF ECONOMICS 122 ( 3 ) 279 - 301 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER WIEN

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 査読

Kojun Hamada

AUSTRALIAN JOURNAL OF MANAGEMENT 42 ( 4 ) 692 - 707 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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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純粋寡占市場における広告競争分析

濱田弘潤

新潟大学経済論集 103 ( 2017-I ) 19 - 40 2017年9月

記述言語：日本語掲載種別：研究論文（大学，研究機関等紀要）出版者・発行元：新潟大学経済学会

本論文では，純粋寡占市場における広告競争について2段階ゲームに基づき理論分析を行う．濱田(2017)では，混合寡占市場における広告競争の分析を行い，パラメータの変化に伴う比較静学の結果を提示した．具体的には，広告により需要が拡大する状況を一般的な設定で考察し，均衡広告水準や均衡生産量がモデルの外生変数に依存してどう変化するかについて，結論を提示した．しかしながら，そもそも純粋寡占市場の下で同様の2段階の広告競争ゲームを考える時，外生変数に依存して均衡広告水準や均衡生産量がどう変化するかについて，結論はあまり自明ではない．本論文では，純粋寡占市場の下で広告競争を分析し，広告が需要に与える影響を一般化したモデル設定で，均衡広告水準や均衡生産量を導出する．また企業の限界費用や企業数等の外生変数の変化が，均衡諸変数にどのような影響を与えるのかについて明らかにする．混合寡占市場の下での結果と比べて，いくつかの異なる比較静学の結果を得る．第一に，純粋寡占市場の下で均衡広告水準と均衡生産量は，広告が真の需要を拡大する程度には全く依存しない．また社会厚生は広告が真の需要を拡大する程度を示すパラメータの厳密な増加関数である．第二に，限界費用の低い企業が増える時，限界費用の高い企業の均衡広告水準は必ず減少するが，限界費用の低い企業の均衡広告水準および均衡総広告水準が増加するか減少するかについては，どちらも起こる可能性がある．第三に，限界費用の低い企業が増える時，均衡総生産量は必ず増えるものの，各企業の均衡生産量について，明確な比較静学の結果を得ることができない．これらの結論は，混合寡占市場の下で得られた結論とは対照的である．

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The transfer paradox in a pay-as-you-go pension system 査読

Kojun Hamada, Akihiko Kaneko, Mitsuyoshi Yanagihara

International Economics and Economic Policy 14 ( 2 ) 221 - 238 2017年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Verlag

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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混合寡占市場における広告競争分析の再考

濱田弘潤

新潟大学経済論集 102 ( 2016-II ) 11 - 35 2017年3月

記述言語：日本語掲載種別：研究論文（大学，研究機関等紀要）出版者・発行元：新潟大学経済学会

本論文は，混合寡占市場における広告競争の理論分析について再検討を行う。具体的には，広告により需要が拡大する一般的な状況を考察し，均衡広告水準や均衡生産量がモデルの外生変数に依存してどう変化するかについて，比較静学の結果を提示する。混合寡占市場の下で広告競争を分析した多くの既存研究は，分析の複雑さを避けるために，広告が真の需要を完全に増加させるケースと全く増加させないケースの，両極端のケースのみを扱ってきた。本論文では，広告が需要に与える影響を一般化したモデル設定で，均衡広告水準や均衡生産量を導出し，企業の限界費用や私企業等の外生変数にの変化が均衡諸変数にどのような影響を与えるのかについて基本的な結果を提示する。比較静学の結果はいくつかの命題にまとめられる。注目すべき結論は以下の通りである。第一に，広告が完全に真の需要を増加させるケースでは，私企業の均衡広告水準はゼロとなり，私企業は公企業の広告投資に完全にただ乗りすることが示される。第二に，私企業数が増加するにつれて，均衡広告水準と均衡生産量が増加するという結論を示す。広告が真の需要を拡大する程度が高まるにつれて，均衡総広告水準が減少する場合があることをシミュレーション結果から明らかにする。さらにシミュレーションにより広告が真の需要を拡大する程度が高まるとしても，社会厚生が必ずしも増加するとは限らないことを明らかにする。

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その他リンク： 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年3月

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