Updated on 2025/03/31

写真a

 
SONODA, Tadashi
 
Organization
Center for Digital Humanities and Social Sciences Professor
Graduate School
Graduate School of Economics
Title
Professor
Contact information
メールアドレス
Homepage
https://www.soec.nagoya-u.ac.jp/~sonoda/FRAME.HTM

Degree 2

  1. Ph.D. in Economics （ 2000.3   University of Tsukuba ） 

  2. M.A. in Business and Commerce （ 1995.3   Keio University ） 

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Research Areas 2

  1. Humanities & Social Sciences / Agricultural and food economics

  2. Humanities & Social Sciences / Agricultural and food economics

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Current Research Project and SDGs 1

  1. ミクロデータに基づく生産性分析

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Research History 4

  1. Nagoya University

    2005.4

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    Country：Japan

  2. Nagoya University

    2005.4

  3. Nagoya Keizai University

    2000.4 - 2005.3

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    Country：Japan

  4. Nagoya Keizai University

    2000.4 - 2005.3

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Education 3

  1. University of Tsukuba   Graduate School, Division of Social Engineering

    1995.4 - 2000.3

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    Country： Japan

  2. Keio University   Graduate School, Division of Commerce

    1993.4 - 1995.3

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    Country： Japan

  3. Keio University   Faculty of Commerce

    1989.4 - 1993.3

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    Country： Japan

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Professional Memberships 8

  1. Agricultural & Applied Economics Association

  2. 日本経済政策学会

  3. 日本経済学会

  4. 日本農業経済学会

  5. Agricultural & Applied Economics Association

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Papers 23

  1. * Effects of the Internal Wage on Output Supply: A Structural Estimation for Japanese Rice Farmers Reviewed

    American Journal of Agricultural Economics   Vol. 81 ( 1 ) page： 131-143   1999.2

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  2. * A System Comparison Approach to Distinguish Two Non-Separable and Non-Nested Agricultural Household Models Reviewed

    Tadashi Sonoda

    American Journal of Agricultural Economics   Vol. 90 ( 2 ) page： 509-523   2008.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  3. Saying Sayonara to the Farm: Hierarchical Bayesian Modeling of Farm Exits in Japan

    Ramsey A. Ford, Ghosh Sujit K., Sonoda Tadashi

    JOURNAL OF AGRICULTURAL ECONOMICS   Vol. 70 ( 2 ) page： 372 - 391   2019.6

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.1111/1477-9552.12290

    Web of Science

  4. Intersectoral labor migration and agriculture in the United States and Japan Open Access

    Ramsey, AF; Sonoda, T; Ko, MKY

    AGRICULTURAL ECONOMICS   Vol. 54 ( 3 ) page： 364 - 381   2023.5

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    Publisher：Agricultural Economics (United Kingdom)  

    In spite of important differences in their agricultural sectors, the past century has seen a significant decline in the number of people employed in agriculture in the U.S. and Japan. Economic models of intersectoral labor migration focus on expected return differentials as the primary cause of migration from one sector to another. Empirical applications typically assume that migration occurs as soon as the return differential exceeds Marshallian migration costs, but recent work has focused on embedding the migration decision in a real options framework. Structural and institutional elements can also affect the speed at which the share of agricultural labor declines. We consider the factors influencing intersectoral labor migration in the U.S. and Japan using aggregate migration equations and several definitions of agricultural labor and return differentials. We show that real options, although relevant at the household level, have limited implications for sector-level empirical models. Our estimates are inconclusive regarding the importance of the Marshallian trigger in the migration decision, with heterogeneity across the two countries and labor definitions. We argue that this heterogeneity in the wage and migration relationship is driven by differences in the structures of the agricultural sectors.

    DOI： 10.1111/agec.12761

    Open Access

    Web of Science

    Scopus

  5. A Solution to the Equity Premium and Riskfree Rate Puzzles: An Empirical Investigation Using Japanese Data (with A. Maki) Reviewed

    Applied Financial Economics   Vol. 12 ( 8 ) page： 601-612   2002

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

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Books 7

  1. Impact of Casual and Permanent Off-Farm Activities on Food Security: The Case of India

    Dsouza A., Mishra A.K., Sonoda T.

    The Role of Smallholder Farms in Food and Nutrition Security  2020.1  （ ISBN:9783030421489, 9783030421472 ）

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    India is the largest producer of food grains, dairy commodities and horticultural crops and largest exporter of rice, beef and cotton. But the country, at the micro-level, still struggles with extensive and deep-rooted problems with food security. The Planning Commission notes that 22% of the 1.2 billion Indians are still living in poverty. This chapter assesses the impact of off-farm income and labour allocation (both casual and permanent off-farmwork), and decisions on food security of smallholder households in India. Promoting food distribution schemes and female education would bring about further reduction of food insecurity among rural households. We found that off-farm activities and off-farm business income reduce food insecurity of rural Indian households. Spouse’s casual off-farm work status had a negative impact on household’s food insecurity-increased food security; operator’s casual off-farm work status had a positive impact on household’s food insecurity- increased food insecurity. However, food insecurity of households increased if both operator and spouse worked casually off the farm.

    DOI： 10.1007/978-3-030-42148-9_10

    Scopus

  2. Agriculture profitability and income disparity: A case study on the market labor supply of household head and farm efficiency in rural China

    Sonoda T.

    Growth with Inequality: An International Comparison on Income Distribution  2012.1  （ ISBN:9789814401708, 9789814401685 ）

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    Language：Japanese

    DOI： 10.1142/9789814401708_0015

    Scopus

  3. A Theory of the Producer-Consumer Household: The New Keynesian Perspective on Self-Employment

    Yoshihiro Maruyama, Tadashi Sonoda（ Role： Joint author）

    Palgrave Macmillan  2011.10  （ ISBN:978-0230301221 ）

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    Language：English

  4. A Theory of the Producer-Consumer Household: The New Keynesian Perspective on Self-Employment

    Yoshihiro Maruyama, Tadashi Sonoda（ Role： Joint author）

    Palgrave Macmillan  2011.10  （ ISBN:9780230301221 ）

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    Responsible for pages：278   Language：English

  5. A theory of the producer-consumer household: The new Keynesian perspective on self-employment

    Maruyama Y., Sonoda T.

    A Theory of the Producer-Consumer Household: The New Keynesian Perspective on Self-Employment  2011.10  （ ISBN:9780230346680, 9780230301221 ）

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    Language：Japanese

    The quick recovery of Asian economies from recent recessions in comparison to the struggling American and European economies can be attributed in part to the positive aggregate-demand externalities of their self-employment sectors. This book presents a behavioural analysis of this effect, with a detailed focus on producer households.

    DOI： 10.1057/9780230346680

    Scopus

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MISC 6

  1. Does Firm Size Matter for the Effect of Productivity on Firms' Market Exit? Evidence from Vietnamese Manufacturing Firms Reviewed

    Vu, T. B. L, T. Sonoda

    Empirical Economics Letters   Vol. 14 ( 3 ) page： ?   2015.3

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    Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

  2. * A System Comparison Approach to Distinguish Two Non-Separable and Non-Nested Agricultural Household Models Reviewed

    Tadashi Sonoda

    American Journal of Agricultural Economics   Vol. 90 ( 2 ) page： 509-523   2008.5

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    Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

  3. * "Internal Instability" of Peasant Households: A Further Analysis of the de Janvry, Fafchamps, and Sadoulet Model Reviewed

    Japanese Journal of Rural Economics   Vol. 6   page： 1-11   2004

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    Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

  4. A Solution to the Equity Premium and Riskfree Rate Puzzles: An Empirical Investigation Using Japanese Data (with A. Maki) Reviewed

    Applied Financial Economics   Vol. 12 ( 8 ) page： 601-612   2002

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    Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

  5. * The Behavior of Agricultural Households under Constrained Off-Farm Wage Employment: An Alternative Decomposition of Their Comparative Statics Analysis Reviewed

    SONODA Tadashi, MARUYAMA Yoshihiro

    Journal of rural economics   Vol. 72 ( 3 ) page： 109-121 - 121,152   2000.12

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    Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：The Agricultural Economics Society of Japan  

    <p>In case the off-farm wage employment is constrained, the "internal wage" plays an important role of equilibrating the demand for labor with its supply within the household. Once this distinct role is recognized, responses of quantities demanded and supplied respectively are decomposed into the direct effects of changes in exogenous variables and the "internal wage effects" of changes in the internal wage caused by those in the same exogenous variables. This method of decomposition proves to be more readily amenable to the standard microeconomic theory to enhance the tractability of agricultural household models under constrained off-farm wage employment.</p>

    DOI： 10.11472/nokei.72.109

    CiNii Books

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Presentations 24

  1. Production Function Estimation Using Cross Sectional Data: A Partial Identification Approach International conference

    AAEA & WAEA Joint Annual Meeting  

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    Event date： 2015.7

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  2. Productivity and Exits from Farming in Japan International conference

    Ramsey, A. F. and T. Sonoda

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    Event date： 2015.7

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  3. Effects of Market Work and Own Household Work on Nutrition Intake of Rural Adults: The Case of Vietnam International conference

    Sonoda, T., A. K. Mishra, and T. B. L. Vu

    AAEA Annual Meeting 2016 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

  4. The Effect of Migration on Farm Household Productivity and Food Security International conference

    Chen, S., A. F. Ramsey, and T. Sonoda

    88th Annual Meeting of the Southern Economic Association 

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    Event date： 2018.11

    Language：English   Presentation type：Oral presentation (general)  

    Country：United States  

  5. Effect of Participation in Wage Work and Non-Farm Business on Bangladesh Rice Production International coauthorship International conference

    Tadashi Sonoda and Md Abdus Salam

    22nd International Conference of the Japan Economic Policy Association   2023.11.18  Japan Economic Policy Association

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    Event date： 2023.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Ristumeikan University  

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KAKENHI (Grants-in-Aid for Scientific Research) 16

  1. ベトナム製造業部門内の細分化した産業に関する集計生産性のミクロパネル分析

    Grant number：24K04875  2024.4 - 2027.3

    科学研究費助成事業  基盤研究(C)

    VU THIBICHLIEN, 園田 正

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    Authorship：Coinvestigator(s) 

    本研究は，2002～2020年のベトナム企業センサスのミクロ・パネルデータに基づき，製造業部門内の14産業について集計生産性を推定し，産業内における個別生産者の生産性の貢献と産業内の資源再配分の貢献に分解し，その説明要因を探る。製造業部門内で細分化した産業，企業属性に関する異質性に注目することにより，資源再配分効果を再検討することにより，ベトナムの製造業部門の生産性向上に必要な方策を考察する。

  2. 農家のミクロ・パネルデータに基づく農業の生産関数と集計生産性に関する実証研究

    Grant number：23K05409  2023.4 - 2026.3

    科学研究費助成事業  基盤研究(C)

    園田 正, VU THIBICHLIEN

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    Authorship：Principal investigator 

    Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）

    開発途上国の経済発展には農業の生産性の向上が重要な役割を果たす。近年の生産性分析では，ミクロ・パネルデータに基づき，個別生産者の生産性とともに，国，地域，産業内の資源再配分に注目した集計生産性を分析している。本研究は，市場発展が進むベトナムとバングラデシュの農家のミクロ・パネルデータを用い，実証例が少ない農業を対象として集計生産性を分析し，開発途上国の食料政策に関する知見を得る。また，最新の生産関数の推定法により適切な生産性を得るとともに，部分識別による新たな推定法により妥当性を検証する。さらに，不十分な資源再配分が深刻な場合，農家モデルに関連する不完全市場の検証法により原因を追究する。
    開発途上国が経済発展を進める上では，農業の生産性の向上が重要な役割を果たす。近年の生産性分析では，生産者のミクロ・パネルデータに基づき，個別生産者の生産性だけではなく，国，地域，産業内の資源再配分（より生産性の高い者がより多くの生産を行う生産要素の配分）に注目した集計生産性の分析が進んでいる。本研究は，市場発展が進むベトナムとバングラデシュの農家のミクロ・パネルデータを用い，実証例が少ない農業を対象として集計生産性を分析し，開発途上国の食料政策に関して新たな知見を得る。また，近年改善が進む生産関数の最新の推定法をふまえ，より適切な生産性を計算する。さらに，不十分な資源再配分のために集計生産性が十分成長しない場合，農家モデルに関連する不完全市場の検証法により原因を追究する。
    本年度は，両国における農業生産関数を推定する準備として，ベトナム資源アクセス家計調査とバングラデシュ統合家計調査のデータを入手・整理して予備的分析を行い，両国では零細規模の農家が多いなどの共通点がある一方，バングラデシュでは外部労働者を雇用する農家が多く，男性の農業労働時間が女性よりはるかに長いことなどの大きな違いもみられることがわかった。また，基礎的な推定法により生産関数の推定を行ったところ，両国について比較的妥当な結果が得られた。また，次年度以降の準備として，代表者と分担者で協力して，生産関数の推定法のレビュー，集計生産性の分析法のレビューを行い，これらに関する問題点を整理した。
    ベトナムとバングラデシュについて最低限必要なデータを入手でき，整理を行うことができた。また，次年度以降に向けて，予備的分析を行うとともに，文献調査を進めることができた。
    来年度は主に生産関数の推定，個別農家の生産性の分析，市場不完全性の検証を行う。代理変数法を粗生産関数の推定に適応させた推定法，システム一般化積率法などに基づき，コブ＝ダグラス型の農業粗生産関数を推定する。推定結果の妥当性の確認後，個別農家の生産性を計算し，分布の特性や成長率等の分析を行う。また，農家モデルに基づく市場の不完全性の検証を行い，次年度に行う資源再配分の不十分性の要因分析に関する予備的分析を行う。

  3. Micro panel data analysis of the inverse relation between productivity and farm size under market development

    Grant number：20K06257  2020.4 - 2024.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Sonoda Tadashi

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    Authorship：Principal investigator 

    Grant amount：\4290000 （ Direct Cost: \3300000 、 Indirect Cost：\990000 ）

    This study examines inverse relationship between farm size and productivity by focusing on market development of production factors and by using microdata on Bangladesh and Vietnam farm households. We find potential U-shape relation in which rice yield decreases until farm size reaches about 2 ha for Bangladesh and 4 ha for Vietnam and that rice yield increases after then. This U-shape is likely to arise in deep relation to market development of labor and land. Specifically, relatively large fixed costs of hiring labor reduces its importance as the farm size increases, and this change consequently causes self-employing farmers who face the inverse relationship to become hiring farmers who do not. However, most farmers in the real world operate at farm size smaller than the turning point of this U-shape, and therefore the inverse relationship continues to be relevant for most farmers in the two countries.

  4. Effects of off-farm labor supply on food supply and nutrition intake: Empirical analysis of Vietnamese farm households

    Grant number：17K07964  2017.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Sonoda Tadashi

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    Authorship：Principal investigator 

    Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

    This study explores effects of off-farm work on food supply and nutrition intake mainly using microdata on Vietnamese farm households. In examining effects of non-farm wage work and non-farm self-employed work on food supply, we conduct a comparative statics analysis of a farm household model, which includes production activities of farm and non-farm commodities, and we find importance of heterogeneous effects of different types of off-farm work. In examining effects of off-farm work on nutrition intake, we explain that an increase in wage work reduces nutrition intake of rural adults but that this negative effect can be weakened by their jobs changing over time. We also explain that short-run migration might not improve diet of rural households. In examining aggregate labor migration, we do not find discontinuity relation between migration from agriculture to non-agriculture sectors and expected wage differential for the two sectors.

  5. Impact of WTO accession on aggregate productivity of the Vietnamese manufacturing sector

    Grant number：17K03733  2017.4 - 2022.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    VU THI BICH LIEN

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    Authorship：Coinvestigator(s) 

    This study uses the Vietnam Enterprise Survey between 2000 and 2015 to investigate impact of WTO accession (in 2007) on aggregate productivity of Vietnamese manufacturing sector. For this purpose, we examine changes in the production function, which represents relation between output and inputs (labor and capital), and changes in productivity of individual firms and the manufacturing sector before and after 2007. According to our results, the WTO accession caused changes in production structure of the manufacturing sector to raise productivity of individual firms, whereas it stagnated the aggregate productivity growth by weakening output reallocation effects, in which firms with higher productivity occupy higher output share in the sector.

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Teaching Experience (On-campus) 1

  1. Market Economy and Society

    2011

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