藪 友良 ( ヤブ トモヨシ )

Yabu, Tomoyoshi

写真a

所属(所属キャンパス)

商学部 ( 三田 )

職名

教授

HP

外部リンク

経歴 【 表示 / 非表示

  • 2005年09月
    -
    2007年06月

    日本銀行金融研究所

  • 2007年07月
    -
    2009年03月

    筑波大学

学歴 【 表示 / 非表示

  • 1999年03月

    一橋大学, 経済学研究科, 応用経済

    大学院, 修了, 修士

  • 2006年01月

    Boston University, 経済学研究科

    アメリカ合衆国, 大学院, 修了, 博士

学位 【 表示 / 非表示

  • MA, 一橋大学, 課程, 1999年03月

  • Ph.D., -, 2006年01月

 

研究分野 【 表示 / 非表示

  • 人文・社会 / 経済統計 (経済統計学)

研究キーワード 【 表示 / 非表示

  • International Finance

  • Time Series Econometrics

 

著書 【 表示 / 非表示

  • 入門 実践する計量経済学

    藪友良, 東洋経済新報社, 2023年04月,  ページ数: 426

  • 入門 実践する統計学

    藪友良, 東洋経済新報社, 2012年09月,  ページ数: 358

論文 【 表示 / 非表示

  • The demand for money at the zero interest rate bound

    Watanabe T., Yabu T.

    Journal of Applied Econometrics 38 ( 6 ) 968 - 976 2023年09月

    ISSN  08837252

     概要を見る

    This paper undertakes both a narrow and wide replication of the estimation of a money demand function conducted by Ireland (American Economic Review, 2009). Using US data from 1980 to 2013, we show that the substantial increase in the money-income ratio during the period of near-zero interest rates is captured well by the log–log specification but not by the semi-log specification, contrary to the result obtained by Ireland (2009). Our estimate of the interest elasticity of money demand over the 1980–2013 period is about one-tenth that of Lucas's paper published in 2000, which used a log–log specification. Finally, neither specification satisfactorily fits post-2015 US data.

  • Japan’s voluntary lockdown: further evidence based on age-specific mobile location data

    Watanabe T., Yabu T.

    Japanese Economic Review 72 ( 3 ) 333 - 370 2021年07月

    ISSN  13524739

     概要を見る

    Changes in people’s behavior during the COVID-19 pandemic can be regarded as the result of two types of effects: the “intervention effect” (changes resulting from government orders for people to change their behavior) and the “information effect” (voluntary changes in people’s behavior based on information about the pandemic). Using age-specific mobile location data, we examine how the intervention and information effects differ across age groups. Our main findings are as follows. First, the age profile of the intervention effect shows that the degree to which people refrained from going out was smaller for older age groups, who are at a higher risk of serious illness and death, than for younger age groups. Second, the age profile of the information effect shows that the degree to which people stayed at home tended to increase with age for weekends and holidays. Thus, while Acemoglu et al. (2020) proposed targeted lockdowns requiring stricter lockdown policies for the oldest group in order to protect those at a high risk of serious illness and death, our findings suggest that Japan’s government intervention had a very different effect in that it primarily reduced outings by the young, and what led to the quarantining of older groups at higher risk instead was people’s voluntary response to information about the pandemic. Third, the information effect has been on a downward trend since the summer of 2020. It is relatively more pronounced among the young, so that the age profile of the information effect remains upward sloping.

  • Japan’s voluntary lockdown

    Watanabe T., Yabu T.

    Plos One 16 ( 6 June )  2021年06月

     概要を見る

    Japan’s government has taken a number of measures, including declaring a state of emergency, to combat the spread COVID-19. We examine the mechanisms through which the government’s policies have led to changes in people’s behavior. Using smartphone location data, we construct a daily prefecture-level stay-at-home measure to identify the following two effects: (1) the effect that citizens refrained from going out in line with the government’s request, and (2) the effect that government announcements reinforced awareness with regard to the seriousness of the pandemic and people voluntarily refrained from going out. Our main findings are as follows. First, the declaration of the state of emergency reduced the number of people leaving their homes by 8.5% through the first channel, which is of the same order of magnitude as the estimates obtained for lockdowns in the United States. Second, a 1% increase in new infections in a prefecture reduces people’s outings in that prefecture by 0.027%. Third, the government’s requests are responsible for about one quarter of the decrease in outings in Tokyo, while the remaining three quarters are the result of citizens obtaining new information through government announcements and the daily release of the number of infections. The findings suggest that what mattered for containing the spread of COVID-19 was not strong, legally binding measures but the provision of appropriate information that encouraged people to change their behavior.

  • Japanese Foreign Exchange Interventions, 1971-2018: Estimating a Reaction Function Using the Best Proxy

    Takatoshi Ito, Tomoyoshi Yabu

    Journal of the Japanese and International Economies  58 2020年12月

    研究論文(学術雑誌), 査読有り

  • 為替介入と外貨準備―運用損益の長期推計

    伊藤隆敏、藪友良

    日本経済研究 (公益社団法人日本経済研究センター)  74   98 - 127 2017年03月

    研究論文(学術雑誌), 査読有り

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KOARA(リポジトリ)収録論文等 【 表示 / 非表示

競争的研究費の研究課題 【 表示 / 非表示

  • 非線形時系列手法を用いたマクロ経済分析

    2020年04月
    -
    2024年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 藪 友良, 基盤研究(C), 補助金,  研究代表者

  • 非線形時系列手法を用いた為替レートの分析

    2017年04月
    -
    2020年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 藪 友良, 基盤研究(C), 補助金,  研究代表者

  • 国際金融の時系列分析

    2014年04月
    -
    2018年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 藪 友良, 基盤研究(C), 補助金,  研究代表者

 

担当授業科目 【 表示 / 非表示

  • 統計学Ⅰ

    2025年度

  • 研究会Qd

    2025年度

  • 研究会Qc

    2025年度

  • 研究会Qb(過年度)

    2025年度

  • 研究会Qb

    2025年度

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