2021/12/13 更新

写真a

ヒガシ ヨウイチロウ
東 陽一郎
HIGASHI Youichiro
所属
社会文化科学学域 教授
職名
教授
外部リンク

学位

  • Ph.D. in Economics ( 2008年5月   University of Rochester )

  • M.A. in Economics ( 2004年10月   University of Rochester )

  • 経済学修士 ( 2000年3月   慶応義塾大学 )

  • 経済学学士 ( 1998年3月   慶応義塾大学 )

研究キーワード

  • 意思決定理論

  • 主観的不確実性

  • 曖昧さ

研究分野

  • 人文・社会 / 理論経済学

経歴

  • 岡山大学経済学部   Faculty of Economics   教授

    2017年4月 - 現在

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  • 岡山大学経済学部   Faculty of Economics   准教授

    2009年4月 - 2017年3月

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  • 法政大学   経済学部   助教

    2008年4月 - 2009年3月

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論文

  • Comparative impatience under random discounting 査読

    Youichiro Higashi, Kazuya Hyogo, Norio Takeoka, Hiroyuki Tanaka

    ECONOMIC THEORY   63 ( 3 )   621 - 651   2017年3月

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    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  

    The random discounting model has been used as a tractable model which is consistent with preference for flexibility. By taking Goldman (J. Econ. Theory 9:203-222, 1974) as an example, we illustrate that under random discounting, the average time preference and preference for flexibility may be conflicting to each other and their mixed effect contributes to revealed impatience. To obtain sharp results in comparative statics, we ask under what kind of probability shifts on discount factors, it is possible to say that one agent always exhibits a more impatient choice than the other even when both agents have flexibility concern. We provide a behavioral definition of impatience comparisons and identify that the relative degree of impatience is measured as a probability shift of a random discount factor in the monotone likelihood ratio order.

    DOI: 10.1007/s00199-015-0950-3

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  • Subjective random discounting and intertemporal choice 査読

    Youichiro Higashi, Kazuya Hyogo, Norio Takeoka

    Behavioral Economics of Preferences, Choices, and Happiness   523 - 571   2016年1月

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Springer Japan  

    This chapter provides an axiomatic foundation for a particular type of preference shock model called the random discounting representation where a decision maker believes that her discount factors change randomly over time. For this purpose, we formulate an infinite horizon extension of Dekel, Lipman, and Rustichini (Econometrica 69:891–934, 2001), and identify the behavior that reduces all subjective uncertainties to those about future discount factors. We also show uniqueness of subjective belief about discount factors. Moreover, a behavioral comparison about preference for flexibility characterizes the condition that one’s subjective belief second-order stochastically dominates the other. Finally, the resulting model is applied to a consumption-savings problem.

    DOI: 10.1007/978-4-431-55402-8_20

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  • Stochastic endogenous time preference 査読

    Youichiro Higashi, Kazuya Hyogo, Norio Takeoka

    JOURNAL OF MATHEMATICAL ECONOMICS   51   77 - 92   2014年3月

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    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 SCIENCE SA  

    Preference for flexibility arises inherently in sequential decision making. However, a majority of the literature has limitations to capture a changing preference for flexibility across time in the sense that such an attitude is independent of past actions. This study incorporates the histories of past actions into an infinite-horizon extension of Dekel et al. (2001) and models a decision maker whose attitude toward flexibility evolves over time from the uncertainty of future time preference or discount factors. Moreover, we provide behavioral comparisons of the degree of patience across different histories and characterize the shift of subjective beliefs about discount factors in the sense of an increasing convex and concave stochastic order. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmateco.2014.01.011

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  • Lexicographic expected utility with a subjective state space 査読

    Youichiro Higashi, Kazuya Hyogo

    ECONOMIC THEORY   49 ( 1 )   175 - 192   2012年1月

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    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  

    This paper provides a model that allows for a criterion of admissibility based on a subjective state space. For this purpose, we build a non-Archimedean model of preference with subjective states, generalizing Blume et al. (Econometrica 59:61-79, 1991), who present a non-Archimedean model with exogenous states; and Dekel et al. (Econometrica 69:891-934, 2001), who present an Archimedean model with an endogenous state space. We interpret the representation as modeling an agent who has several "hypotheses" about her state space, and who views some as "infinitely less relevant" than others.

    DOI: 10.1007/s00199-010-0546-x

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  • Subjective random discounting and intertemporal choice 査読

    Youichiro Higashi, Kazuya Hyogo, Norio Takeoka

    JOURNAL OF ECONOMIC THEORY   144 ( 3 )   1015 - 1053   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    This paper provides an axiomatic foundation for a particular type of preference shock model called the random discounting representation where a decision maker believes that her discount factors change randomly over time. For this purpose, we formulate an infinite horizon extension of [E. Dekel, B. Lipman, A. Rustichini, Representing preferences with a unique subjective state space, Econometrica 69 (2001) 891-934], and identify the behavior that reduces all subjective uncertainties to those about future discount factors. We also show uniqueness of subjective belief about discount factors. Moreover, a behavioral comparison about preference for flexibility characterizes the condition that one's subjective belief second-order stochastically dominates the other. Finally, the resulting model is applied to a consumption-savings problem. (C) 2008 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jet.2008.09.002

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  • History-Dependent Random Discounting 査読

    Youichiro Higashi, Kazuya Hyogo, Norio Takeoka

    NUMERICAL ANALYSIS AND APPLIED MATHEMATICS, VOLS 1 AND 2   1168   965 - +   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    In the literature of dynamic models under uncertainty, it is commonly assumed that uncertainty is resolved gradually over time and its resolution is independent of the actions taken by a decision maker up to that time period. However, contingencies in the decision maker's mind may change and even increase over time according to habits that have evolved by experiences, actions, or consumptions in the past. We provide an axiomatic model where the decision maker faces uncertainty about her own time preference or discount factors in future and these uncertainty may evolve according to histories or habits from the past consumption.

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  • Comment on “Ellsberg’s two-color experiment, portfolio inertia and ambiguity” 査読

    Youichiro Higashi, Sujoy Mukerji, Norio Takeoka, Jean-Marc Tallon

    International Journal of Economic Theory   4 ( 3 )   433 - 444   2008年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1111/j.1742-7363.2008.00087.x

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  • Firm specific human capital and unemployment in a growing economy 査読

    Youichiro Higashi

    JAPAN AND THE WORLD ECONOMY   14 ( 1 )   35 - 44   2002年1月

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    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 SCIENCE BV  

    This study analyzes how the intensive use of firm specific human capital in firms affects the unemployment rate. For this purpose, I introduce into an equilibrium search model the possibility that workers quit their jobs. A worker changes his job when a firm that newly enters into the market offers a higher wage than his current wage. If firm specific human capital is important, it is difficult for a worker to quit his job, and, in consequence, the number of workers who quit their jobs is small. Thus, the unemployment rate is low. If the speed of technology obsolescence is high, the unemployment rate is high. (C) 2002 Elsevier Science B.V. All rights reserved.

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