Past Events
第64回NIESG定例研究会は、2025年8月23日に、岡山大学で開催されました。
ご尽力頂いた岡山大学大越裕史先生、および発表、参加された方々に感謝申し上げます。
第63回NIESG研究会は、2025年4月19日に、岩手県立大学で開催されました。
ご尽力頂いた岩手県立大学中坊勇太先生、および発表、参加された方々に感謝申し上げます。
The 64th NIESG Meeting was successfully held on August 23, 2025 in Okayama, Japan
We would like to appreciate Prof. Hirofumi Okoshi, Okayama University, for his all effort for hosting the meeting.
The 63rd NIESG Meeting was successfully held on April 19, 2025 in Iwate, Japan
We would like to appreciate Prof. Yuta Nakabo, Iwate Prefectural University, for his all effort for hosting the meeting.
第64回研究会岡山大学
2025年8月23日
（岡山大学）
The64th NIESG Meeting at Okayama University
August 23, 2025
(Okayama University)
第64回研究会＠岡山大学
（共催：岡山大学経済学部現代経済セミナー）
The 64th Meeting in Okayama,
co-hosted by Okayama University Economics Seminars
Date
2025年8月23日（土）
August 23, 2025
Venue
岡山大学津島キャンパス 文法経２号館５階 経済学部会議室
Tsushima Campus, Okayama University, Building No.2 for Depts. of Economics, Law and Literary, 5 Floor, Dept. of Economics Meeting Room
Program:
1st presentation: 14:00－15:00
Presenter:
王 睿霆 氏（岡山大学）
Ruiting WANG (Okayama University)
Theme:
Governing by numbers: Political incentives, target distortion, and organizational misreporting
Abstract:
TBA
15:00－15:10 Coffee Break
2nd presentation: 15:10－16:10
Presenter:
寶多 康弘 氏（南山大学）
Yasuhiro TAKARADA (Nanzan University)
Theme:
Privatization neutrality in mixed oligopoly with externalities
Abstract:
This study examines whether market intervention through public firms can be an effective policy tool to tackle externalities. To address this issue, we develop a mixed oligopoly model with general demand, cost, and externality functions, and allow externalities to be positive or negative. In this general framework, we demonstrate that the optimal degree of privatization is independent of the level of externalities if the cost function is quadratic. This result holds even when the number of private firms is exogenous or endogenously determined under free entry. In the case of linear demand, the optimal degree of privatization never exceeds 20 percent in a mixed duopoly, and increases with the number of private firms in a mixed oligopoly, even under a general externality function. These findings can be referred to as renewed privatization neutrality, which shows that the optimal degree of privatization is independent of externalities. From the perspective of policy implementation, our results suggest that the government should rely on policy instruments other than privatization to control externalities.
16:10－16:20 Coffee Break
3rd Presentation: 16:20－17:20
Presenter:
須賀 宣仁 氏（北海道大学）
Nobuhito SUGA (Hokkaido University)
Theme:
Trade and firm selection under perfect competition in a Ricardian model with a continuum of goods
Abstract:
This study examines trade patterns, the welfare effects of trade, and the impact of country size on wages and welfare when firm selection occurs under perfect competition in a two-country Ricardian model with a continuum of goods. We show that, regardless of country size, a country tends to export goods for which its relative average productivity is higher under autarky; that is, trade patterns follow the Ricardian comparative advantage. The presence of firm heterogeneity implies that both countries produce goods that are similar to the borderline good in terms of relative average productivity. We also show that a country gains from trade, even if it produces all of its imported goods, because the trade-induced firm selection improves average productivity in export sectors, leading to higher real wages measured by exported goods. As for the impact of country size, if all goods are produced in both countries, a country experiences a rise in its relative wage when it grows in terms of labor endowment. Furthermore, in this case the country that experiences the growth in labor forces suffers a decrease in per-capita real income due to falling average productivity in export sectors.
18:00 - Dinner
第63回研究会岩手県立大学
2025年4月19日
岩手県立大学アイーナキャンパス（いわて県民情報交流センターアイーナ7階）
63rd Meeting in Iwate
Date: April 19, 2025
Venue: Aiina Campus, Iwate Prefectural University
第63回研究会＠盛岡・岩手
The 63rd Meeting in Morioka, Iwate
Date
2025年4月19日（土）14時開始
April 19, 2025. 14:00 -
Venue
岩手県立大学アイーナキャンパス（学習室4）
いわて県民情報交流センター"アイーナ"７階
"Aiina" Campus, Iwate Prefectural University (Room 4)
Iwate Prefectural Information Exchange Center "Aiina", 7th Floor
Program:
1st presentation: 14:00－14:50
Presenter:
島田 悦作 氏（岩手県立大学）
Etsusaku SHIMADA (Iwate Prefectural University)
Theme:
日本における野生動物による作物被害と農業者属性が耕作放棄地に与える影響分析：農業の持続可能性をめぐって
(Analysis of the Impact of Wild Animal Damage on Crops and Farmer Attributes on Farmland Abandonment in Japan: Regarding Agricultural Sustainability)
Abstract:
本研究は、日本の農業・農村環境が有する多面的な機能を損なうもの、または守るものが何かを、農業者の属性や集落営農に着目して明らかにする。
( Japanese only)
2nd presentation: 14:50－15:40
Presenter:
市田 敏啓 氏（早稲田大学）
Toshihiro ICHIDA (Waseda University)
Theme:
ポルシェの中古車価格に与えるオプションの影響
(The Impact of Options on Used Porsche Cars Prices)
Abstract:
本研究は独自のデータセットを用いて、新車購入時におけるオプション選択がポルシェの中古車に対してどのような影響を与えるのかについて実証した初めての論文である。オプションの多くは中古車価格に反映されず、新車購入時にかかる費用を回収できないものの、市場において重要とされている一部のオプションは中古車価格に反映され、初期費用を上回ることがわかった。また、重要とされるオプションはモデルによって異なるものの、ポルシェというスポーツカーブランドにおいて象徴的な意味を持つオプションはモデルを通じてプレミアムをもたらすことがわかった。この結果は、消費者のオプション選択に一定の示唆を与える。例えば、市場で重要な一般的なオプションを選ぶことで、所有期間中にそのオプションから効用を得られ、さらに経済的にも得をするという観点から有用である。
(Japanese only)
15:40－16:00 Coffee Break
3rd Presentation: 16:00－16:50
Presenter
小澤 駿弥 氏（神戸大学）
Shunya Ozawa (Kobe University)
Theme:
Move Together or Drop Out? The Impact of “Going Further Ahead” by Front-runners of Climate Action
Abstract:
Although it has been several decades since global environmental issues were recognized and the need for multilateral cooperation was acknowledged, it is difficult to say that multilateral cooperation schemes are functioning properly. In this situation, certain groups of countries, such as the EU and the Powering Past Coal Alliance (PPCA), have taken the lead in introducing strict carbon taxes. Then, how do other countries respond to the decisions made by these leading countries? Do they move together and raise their carbon tax rates, or do they free-ride by lowering their carbon tax rates? To answer this question, we analyze the responses of other countries using a quantitative trade model that incorporates carbon dioxide emissions and the negative utility caused by them. Our findings reveal that many countries drop out except for China. However, the results would be very mixed when we assume that each country can set different tax rates across the types of fossil fuels.
Moreover, our analysis also examines the impacts on carbon dioxide emissions, and shows that carbon dioxide emissions increase in the drop countries, which results in the increase in the global carbon dioxide emissions.
4th Presentation: 16:50－17:40
Presenter:
篠崎 剛 氏（東北学院大学）
Tsuyoshi Shinozaki (Tohoku Gakuin University)
Theme:
Automation and Economic Growth in an OLG Model with Bequests
Abstract:
TBA
18:30- Dinner
第62回研究会宮崎産業経営大学
2024年9月21日
（宮崎産業経営大学）
The 62nd NIESG Meeting in Miyazaki
September 21, 2024
(Miyazaki Sangyo-keie University)
第62回研究会＠宮崎
The 62nd Meeting in Miyazaki
Date
2024年9月21日（土）14:30開始
September 21, 2024. 14:30 -
Venue
宮崎産業経営大学5号館（5213教室）
Miyazaki Sangyo-keiei University Building 5 (Room 5213)
Program
1st presentation: 14:30－15:30
Presenter:
山梨 顕友 氏（宮崎産業経営大学）
Akitomo YAMANASHI (Miyazaki Sangyo-keiei University)
Theme:
雇用関心に起因する保護貿易政策についての理論の検証
(Testing Theories of Trade Protectionism caused by Employment Concerns )
Abstract:
ヘクシャーオーリン型貿易モデルにサーチ理論に従い雇用市場の不完全性を導入して、関税の賦課もしくは補助金の給付が雇用の変化を通じて厚生に与える影響を分析した。定常均衡において関税賦課政策がもたらす厚生効果をさまざまな要因ごとに分類して定式化した結果、雇用の変化の要因は正の厚生効果をもたらすことが示された。投票データを用いて雇用の変化の要因が現実の保護貿易政策の採用を説明できるかどうか検証した結果を報告する。
(Japanese only)
15:30－15:40 Coffee Break
2nd presentation: 15:40－16:40
Presenter:
高倉 啓 氏（鹿児島大学）
Kei TAKAKURA (Kagoshima University)
Theme:
Notes on a Defense of Compulsive Measures Against Child Labor
Abstract:
In this study, we reconstruct Dessy's (2000) model employing a simpler overlapping generations model. This study also analyzes the interrelationship between child labor, fertility, and human capital. The model's basic structure coincides with that of Dessy (2000); however, the dynamic system's phase diagram differs from the conventional one.
16:40－16:50 Coffee Break
3rd Presentation: 16:50－17:50
Presenter
荒 知宏 氏（福島大学）
Tomohiro ARA (Fukushima University)
Theme:
Global Firms: New Implications from Importing-Exporting
Abstract:
This paper studies the role of global firms that simultaneously import and export in aggregate outcomes. Using Chinese customs data, we document import-export complementarity at firm level and industry level. To examine this implication, we develop a heterogeneous firm model where final goods are produced with intermediate inputs subject to selection into importing and exporting. We find that the model of importing-exporting amplifies the effect of trade liberalization (relative to that in standard trade models of either exporting-only or importing-only) on trade flows and welfare through disproportionate share reallocations toward most efficient global firms.
19:00- Dinner
第61回研究会鹿児島大学
2024年5月18日
（鹿児島大学）
The 61st NIESG Meeting in Kagoshima
May 18, 2024
(Kagoshima University)
第61回研究会＠鹿児島
The 61st Meeting in Kagoshima
Date
2024年5月18日（土）14:30開始
May 18, 2024. 14:00 -
Venue
鹿児島大学郡元キャンパス法文学部３号館（103教室）
Korimoto Campus, Kagoshima University, Dept. of Law & Literature, Building 3 (Room 103)
Program
1st presentation: 14:00－15:00
Presenter:
高倉 啓 氏（鹿児島大学）
Kei TAKAKURA (Kagoshima University)
Theme:
Child Mortality, Child Labor, Fertility, and Development
Abstract:
If developed countries were to implement policies to improve infant survival probability by aiding developing countries, would this necessarily promote economic development? This study aims to answer this question. This study employs a two-period overlapping generations model to determine how an increase in infant survival probability affects developing countries. The results show that policies to improve infant survival probability are effective in economies with sufficient human capital accumulation, but exacerbate poverty in economies with low human capital accumulation. This is because child labor exists in the least developed countries and buffers individuals from the costs of poverty and educational investment.
2nd presentation: 15:00－16:00
Presenter:
森本 貴陽 氏（中京大学）
Takaaki MORIMOTO (Chukyo University)
Theme:
Effects of Capital-use Tax and Automation Subsidy in an Endogenous Growth Model
Abstract:
To examine the effects of capital-use tax and automation subsidy on the fraction of automated industries and the inequality between capitalists and workers, we formulate an endogenous growth model with automation, innovation, and human capital accumulation. We show that a higher capital-use tax drives down the wage rate and stimulates automation on the balanced growth path (BGP), while a reduction in automation subsidies also lowers the wage rate but inhibits automation.
16:00－16:20 Coffee Break
3rd Presentation: 16:20－17:20
Presenter
倉田 洋 氏（東北学院大学）
Hiroshi KURATA (Tohoku Gakuin University)
Theme:
Corporate Environmentalism at the Nash and Kantian Equilibria
Abstract:
We explore the characteristics of the Nash and Kantian equilibria and their impact on corporate environmentalism. We focus on oligopolistic firms' investments in environmental technology and compare the level of investment under Kantian behavior with that under Nash behavior and the social optimum. We show that the Kantian equilibrium investment is greater than the Nash equilibrium investment if they are concerned about other firms' environmental damage. We also demonstrate that the Nash equilibrium investment is always below the social optimum, whereas the Kantian equilibrium investment can exceed the socially optimal level.
4th Presentation: 17:20－18:20
Presenter
荒 知宏 氏（福島大学）
Tomohiro ARA (Fukushima University)
Theme:
Partial Equity Ownership in International Trade
Abstract:
This paper investigates welfare implications of partial equity ownership (PEO) in international trade. PEO allows firms to facilitate production transfer across borders increasing joint profits of PEO pairs, but it simultaneously reduces the degree of competition in the domestic market decreasing consumer surplus. We find that if firms freely choose levels of PEO, the former benefit is dominated by the latter cost and a government has an incentive to restrict PEO between domestic and foreign firms. However, this does not always mean that the government should completely ban PEO; instead, it may improve social welfare by allowing for PEO with large trade costs, although optimal levels are lower than those set by PEO pairs. The welfare result is more likely to occur when there is cost asymmetry among domestic firms.
19:30- Dinner