Researcher Database
Last Updated :2024/07/25
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SugaName (Kana)
NobuhitoName
201301057338392926
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- 2022/04 - Today Hokkaido University Professor
- 2006/04 - 2022/03 Hokkaido University Associate Professor
Published Papers
- Nobuhito Suga, Makoto Tawada, Akihiko YanaseFOREIGN TRADE REVIEW 0015-7325 2022/09 [Refereed]
In a simple two-country Ricardian economy with public infrastructures, we consider a simultaneous and non-cooperate game between governments with respect to public infrastructure supply. Then it is shown that a country with larger (smaller) factor endowment exports a good whose production is more (less) dependent on public infrastructures, and both countries will gain from trade as long as factor endowment differs between countries. However, the following special features appear. (i) Any incompletely specialising country produces two goods at an inner point of the production possibility set. (ii) If factor endowment is the same between countries, the trading equilibrium is attained by the pattern of specialisation such that each country specialises in one good different from each other and both countries become better off. Which country specialises in which good is indeterminate. The result shows a typical case of symmetric breaking. - Makoto Tawada, Nobuhito Suga, Akihiko YanaseCanadian Journal of Economics/Revue canadienne d'économique 55 (2) 1135 - 1165 2022/05 [Refereed][Not invited]
- Hiroshi Kurata, Ryoichi Nomura, Nobuhito SugaREVIEW OF INTERNATIONAL ECONOMICS 28 (1) 119 - 137 0965-7576 2020/02 [Refereed][Not invited]
This paper presents a North-South trade model with vertically linked industries and examines how declining costs of trade across stages of production encourage vertical specialization and affect wages and welfare. As trade costs fall below a threshold, the production of all final goods relocates to the South and vertical specialization emerges. In some industries, production of intermediate goods also relocates against comparative costs because of benefits of co-location, and further declines in trade costs lead to reshoring. A country may temporarily lose from falling trade costs, but both countries can be better off after trade costs fall sufficiently. - 一般寡占均衡における貿易パターンと貿易利益ーリカード型2国２財モデルにおける考察ー須賀宣仁近藤健児・寶多康弘・須賀宣仁（編著）『国際貿易理論の現代的諸問題』（中京大学経済研究所研究叢書）勁草書房 179 - 202 2019/03 [Not refereed]
- Hiroshi Kurata, Ryoichi Nomura, Nobuhito Suga東北学院大学経済学論集 東北学院大学学術研究会 (183) 41 - 56 1880-3431 2014/12 [Not refereed]
- Suga Nobuhito, Tawada MakotoThe International Economy 日本国際経済学会 2010 (14) 95 - 112 2186-6074 2010 [Refereed]
This paper presents a two-country model of monopolistic competition in which production of differentiated products in the manufacturing sector lowers productivity in the agricultural sector through a cross-sector pollution externality. We show that free trade raises the spatial separation of the incompatible industries and is possibly harmful to the country that becomes a net exporter of the manufacturing products. Also, we reveal that with product differentiation, trade only in the manufacturing products can be the most beneficial trade regime for the country holding a comparative advantage in those products. - Kenji Fujiwara, Nobuhito Suga, Makoto TawadaGLOBALIZATION AND EMERGING ISSUES IN TRADE THEORY AND POLICY 5 209 - 229 1574-8715 2008Purpose - This chapter aims to examine trade patterns and gains from trade in a two-country general equilibrium model of increasing returns and oligopoly.Approach - A general equilibrium model of increasing returns and oligopoly.Findings - The determination of patterns of specialization and trade and gains from trade highly depends on the interaction between the degree of increasing returns and market power as well as the cross-country difference in factor endowments.Originality - Unlike the existing literature, we endogenize the determination of specialization by using an allocation curve approach by Ethier (1982). To our knowledge, there is no comparable study that incorporates Ethier's (1982) approach to oligopolistic models of international trade.
- クールノー競争下の貿易パターンと貿易利益ーリカード・モデルにおける考察ー須賀宣仁近藤健児・藪内繁己（編著）『現代国際貿易の諸問題―環境、対外援助、国際間要素移動と不完全競争』（中京大学経済学部付属経済研究所研究叢書）勁草書房 211 (225) 2007/09
- Nobuhito Suga, Makoto TawadaREVIEW OF INTERNATIONAL ECONOMICS 15 (2) 284 - 293 0965-7576 2007/05 [Refereed]
This paper presents a one-primary factor, two-consumer good, and two-country model of international trade where each country's government supplies a country-specific public intermediate good so as to attain efficient production. By introducing the Marshallian adjustment process, it is demonstrated that the country with larger factor endowment exports the good whose productivity is more sensitive to the public intermediate good. Our normative analysis of free trade shows the following results. First, at least one country gains from trade. Secondly, if a country incompletely specializes in the trading equilibrium, the country necessarily loses from trade. - Nobuhito SugaPACIFIC ECONOMIC REVIEW 12 (2) 225 - 235 1361-374X 2007/05 [Refereed]
This paper investigates the effects of transboundary pollution on trade and welfare in a two-country, two-good, one-factor model in which pollution is treated as a negative cross-industry externality. It is shown that trade may improve countries' natural environment and consequently raises the countries' welfare if a comparative advantage in a pollution-producing good is held by a country that greatly surpasses the other in pollution abatement technology. This result has not been obtained from existing models of this type. - Nobuhito SugaNorth American Journal of Economics and Finance 18 (1) 77 - 91 1062-9408 2007/02/01 [Refereed]
This paper presents a two-country model of monopolistic competition in which differentiated products are produced subject to external economies of scale and two countries differ only in size measured by the factor endowment. It is shown that under free trade, the larger country has positive net exports of differentiated products, which leads to its gains from trade, while the smaller country may lose from trade. Noteworthy is that the industrial agglomeration induced by inter-industry trade is possibly harmful to both countries if the two countries are similar in size and the taste for product diversity is sufficiently strong. © 2007 Elsevier Inc. All rights reserved. - Nobuhito SugaJournal of Economics/ Zeitschrift fur Nationalokonomie 85 (1) 73 - 97 0931-8658 2005/07 [Refereed]
In this paper, we present a two-country trade model with external economies of scale that emerge on an international level but are partially localized in each country. First, we show that the larger country exports the good produced in an industry with external economies of scale in the trading equilibrium. Second, we investigate the welfare effects of trade for the following two cases: (I) the case where external economies are completely localized in autarky; (II) the case where external economies are internationally effective in autarky. In case (II), it is shown that trade can be welfare-decreasing for both countries. © Springer-Verlag 2005. - Nobuhito SugaEconomics Bulletin 6 (1) 2005 [Refereed]
This paper reexamines the patterns of trade in a Chamberlinian-Ricardian model by introducing a simple dynamic process of labor reallocation. Our analysis shows the following results. First, the patterns of inter-industry trade are determined by technical differences among countries. Second, whether intra-industry trade emerges depends not only on the cross-country technical heterogeneity but also on the size of a country and the expenditure share for differentiated products. Our main finding is that intra-industry trade can emerge in the trading equilibrium even if there is technical heterogeneity among countries. - Nobuhito SugaStudies in Regional Science 33 (2) 69 - 73 0287-6256 2003 [Refereed]
This note has two aims. One is to assert that, for a positive function in Rn++, Friedman's Theorem (1973, Theorem 2) holds without the non-decreasingness property in his Assumption 1. The other is to propose a similar theorem based on his theorem and then to show that Eichhorn's theorem (1981, Collorary 2) is derived from our theorem. © 2003, JAPAN SECTION OF THE REGIONAL SCIENCE ASSOCIATION INTERNATIONAL. All rights reserved. - SUGA NobuhitoStudies in Regional Science 日本地域学会 32 (1) 33 - 44 0287-6256 2001 [Refereed]
This paper develops a two-country, two-sector model of international trade in which the stock of environmental capital accumulates over time. It shows how the pattern of production and the welfare level of each country change by opening trade when there is production externalities in the form of worldwide-scale pollution.
There have appeared many theoretical studies on the interaction between trade and the environment. Among them, we focus on the model of Copeland and Taylor [3] (1999) which analyzes the pattern of production and the welfare level of each country in the Ricardian type of trade model with local environmental pollution.
In this paper we re-examined their analysis under the supposition that pollution generated in one country possibly influences the economic activities of other countries. Then we show essentially the same results as those in Copeland and Taylor's analysis. But we deepen their analysis and obtain an implication that the relationship between the relative demand of manufacturing goods to the agricultural ones and the relative level of foreign environmental capital to the home one plays the significant role in determining the pattern of production. In addition, we make clear the relationship between the pattern of production and the transboundary degree of pollution.
MISC
- 須賀 宣仁 The annals of Research Center for Economic and Business Networks 5- (5) 53 -55 2016/03
- ［書評］高橋信弘著『産業内貿易の理論』須賀宣仁 世界経済評論 57- (2) 2013/03
Books etc
- 近藤, 健児, 寳多, 康弘, 須賀, 宣仁 (Joint editor)
勁草書房 2019/03 (ISBN: 9784326549764) x, 271p - 須賀, 宣仁
博士学位論文 2004 iii, 97枚
Association Memberships
Research Projects
- 日本学術振興会：科学研究費助成事業 基盤研究(C)Date (from‐to) : 2021/04 -2024/03Author : 須賀 宣仁令和３度は、単一の生産要素とリカード的な比較優位を想定したオフショアリング・モデルを構築し、リショアリングが生じる条件と基本的メカニズム、加えて、リショアリング（生産の国内回帰）の発生・進展が貿易、賃金および社会厚生に及ぼす影響について分析を行った。オフショアリング・コスト（生産の海外移転にともなう費用）の低下とともに生産工程レベルの国際分業がどのように変化するかを考察することにより、どのような条件のもとでどのようにリショアリングが生じるかを分析した。リショアリングが生じるか否か、また、リショアリングをともなう国際分業の変化がどのように進展するかは、生産要素賦存量で測った各国の相対的なサイズの違い、生産部門間の相対生産性に関する国際的格差、および各財への支出額が国民所得に占める割合（各財に対する選好の強さ）に依存することが示された。さらに、貿易や賃金、社会厚生の変化についても、それらの経済の基礎的諸条件に依存して、様々な変化のパターンを示すことが明らかにされた。 上記の研究には二つの学術的意義がある。第一に、本研究はその分析対象において従来の研究と一線を画している。オフショアリング・コストの低下の影響を考察している一部の既存研究にはリショアリングの可能性を示しているものもあるが、それは上流部門におけるリショアリングである。それに対して、本研究では多くの事例で観察される下流部門におけるリショアリングのメカニズムおよびその影響について考察している。第二に、本研究のオフショアリング・モデルには様々な応用可能性がある。本研究のオフショアリング・モデルは伝統的なリカード・モデルを下地とする極めてシンプルなものである。それゆえ、租税・補助金競争や関税戦争、地域貿易協定など、工程間分業に基づく相互依存性が重要な役割を果たす様々な問題の分析において本研究のモデルは応用可能である。
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2018/04 -2021/03Author : Nobuhito SugaThis study analyzes oligopolistic or vertically linked markets from multiple points of view and shows several interesting results. The main findings of this study are as follows. (1) The patterns of trade and specialization attained in the general oligopolistic equilibrium can go against the Ricardian theory of comparative advantage. (2) The fall in trade costs not only causes offshoring in the downstream sector but also may lead to the ensuing reshoring in the downstream or upstream sector. (3) Given that the entry regulation in the upstream sector affects a country’s comparative advantage, the equilibrium outcomes of international policy game regarding entry regulation crucially depend on trade costs and preferences.
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)Date (from‐to) : 2016/04 -2020/03Author : Yanase AkihikoThis 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.
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)Date (from‐to) : 2012/04 -2015/03Author : SUGA NobuhitoThis research shows the impacts of market integration on industrial location, resource allocation, income distribution and economic welfare theoretically. The main findings are as follows. (1) In a small open economy, the number of oligopolistic firms who supply intermediate goods locally can be insufficient from the perspective of social efficiency. (2) Market integration in intermediate goods sectors not only causes a one-way shift in the location of manufacturing production toward a developing economy from an advanced economy but also gets back to an advanced economy the production of a certain spectrum of intermediate goods which moved to a developing economy. (3) There is a possibility that trade liberalization has a welfare-reducing effect under consumers’ love-of-variety preferences and variable expenditure shares (i.e., expenditure shares depending on commodity prices).
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)Date (from‐to) : 2008 -2010Author : OKAWA Masayuki, TAWADA Makoto, OKAMURA Makoto, OHKAWA Takao, SUGA NobuhitoIn our research, we have succeeded in obtaining many new and significant results, which preceding literature did not find, on the firms optimal location choice problem whether the firms export or undertake foreign direct foreign investment in various circumstances. Also we have analyzed the optimal trade and/or industrial polices of the governments of the source and host countries on the firms strategic behavior including location choice behavior. We also obtained novel results on the international environment problems including cross border pollutions, and on the mutually beneficial economic aid for both donor and host countries under imperfect competition.
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)Date (from‐to) : 2008 -2010Author : SUGA NobuhitoThe purpose of this study is to investigate how the economic integration induced by trade liberalization and falling trade costs affects each country's industrial structure, trade pattern and welfare. In the analysis of this study, the special emphasis is placed on the role of economies of scale and imperfect competition as a determinant of the international division of labor. This study successfully sheds light on the effects of economic integration on each country in the general equilibrium framework with economies of scale and imperfect competition.
- 日本学術振興会：科学研究費助成事業 若手研究(スタートアップ)Date (from‐to) : 2006 -2007Author : 須賀 宣仁本年度は、規模の経済・独占的競争下の国際貿易に関する一般均衡論的分析において以下のような成果が得られた。 1.氷塊型の中間財輸送費をともなう独占的競争型分業モデルに国際的な技術格差を導入し、輸送費と技術格差の相互作用が貿易均衡の性質(均衡の一意性・安定性)および各国の特化パターンに与える効果の解明に成功した。新経済地理学における多くの理論モデルとは異なり、本研究が提示するモデルにおいては、数値例に依存することなく一般的な均衡解を求めることが可能である。このため、同モデルは、経済のグローバル化が各国の比較優位構造(例えば、先進国-途上国間の国際分業)にどのような影響を与えるかを考察するための一つの有用な分析枠組を与えるものである。 2.外部的規模の経済をともなう多数国独占的競争モデルにおいて、市場均衡における産業クラスターの数と規模が社会的最適水準からどのように乖離するのかを明らかにした。完全競争市場を仮定した場合、産業クラスター形成をめぐる政府間競争のもとで達成される産業クラスターの数と規模は、社会的最適水準に一致することが知られている。しかし、独占的競争市場を仮定した本研究のモデルにおいては、同様の政府間競争が行われたとしても、均衡における産業クラスターの数は社会的最適水準とは一致しないことが示された。製品差別化をともなう水平的産業内貿易は現代の国際貿易の重要な特徴の一つであり、それゆえ、上記の分析結果は、各国の協調的政策が世界全体の経済厚生を改善させる可能性があることを示唆するものである。
- 日本学術振興会：科学研究費助成事業 特別研究員奨励費Date (from‐to) : 2004 -2005Author : 須賀 宣仁本年度の研究成果は、以下のように要約できる。 1.本年度は純粋公共中間財をともなう国際貿易モデルの研究において大きな成果が得られた。本研究は、リンダール・ルールに基づく効率的公共財供給を前提とする二国モデルにおいて貿易損失の可能性を示している。この研究成果は"International Trade with a Public Intermediate Good and the Gains from Trade," Review of International Economics(forthcoming)で発表予定である。 2.本年度のもう一つの主要な成果として、マーシャル的外部経済をともなう独占的競争型貿易モデルの研究がある。本研究は、独占的競争部門に企業集積から生じる正の外部効果が存在するならば、自由貿易下において同部門が大国に集積する傾向があることを示している。これは伝統的収穫逓増モデルの結果と一致しており、ゆえに、本研究は従来ブラックボックスとされてきたマーシャル的外部経済の発生要因のモデル化に成功したと言える。また、本研究は、収穫逓増産業が各国に分散する産業内貿易の方が一国への産業集中をもたらす自由貿易よりもパレート優越的となる可能性があることを示している。これらの研究成果は"A Monopolistic Competition Model of International Trade with External Economies of Scale," mimeograph(2006)として結実している。 3.本年度はさらに、収穫逓増的な生産技術をともなう寡占的競争型貿易モデルについての研究を行った。本研究では、モデルを特徴付ける両極的ケースの一端として、伝統的な収穫逓増型貿易モデルの産業集積パターンと貿易利益定理が示された。これらの結果は"A Unified Model of International Trade with Increasing Returns and Oligopoly," mimeograph(2005)にまとめられている。本研究は伝統的な不完全競争モデルと収穫逓増モデルの統合を目指す新たな試みの一つとして位置付けられる。 上記の分析結果はすべて要素代替を伴わない一要素モデルにおいて得られたものであるが、本年度は不完全競争などを導入することにより、モデルをより現実的な設定へと拡張することに成功したと言える。