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HIRAGA Kazuki

    Graduate School of Economics Department of Economics　Associate Professor
Last Updated :2024/08/28

Researcher Information

J-Global ID

Research Areas

  • Humanities & social sciences / Economic policy
  • Humanities & social sciences / Public economics, labor economics

Published Papers

Research Grants & Projects

  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2023/04 -2026/03 
    Author : 宮崎 憲治; 平賀 一希; 郡司 大志
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2022/04 -2025/03 
    Author : 眞鍋 雅史; 植杉 威一郎; 平賀 一希; 吉野 直行
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2021/04 -2024/03 
    Author : 植杉 威一郎; 眞鍋 雅史; 吉野 直行; 平賀 一希
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2020/04 -2023/03 
    Author : 宮崎 憲治; 平賀 一希; 郡司 大志
     
    本年度も、既存研究の整理とともに、論文作成をおこなった。月に2回の頻度でオンラインツールzoomを使って共同研究者2名と定期的にやり取りが続いている。 論文「Tax Deduction Matters: The Laffer Curve, the Elasticity of Taxable Income, and the Tax Revenue Elasticity」を、昨年度の研究実績で予定した通りに、日本経済学会2021年度春季大会（オンライン）に報告することができた。京都大学の西山先生がコメンテーターであったが彼およびフロアのコメントをもとに改訂し、査読雑誌へ投稿した。最初の雑誌については残念ながらリジェクトであったが、いくつかの建設的なコメントをもとに改訂中である。 また昨年投稿中であった、論文「An Industrial-Organization Approach to Conventional and Unconventional Monetary Policy」が国際査読雑誌Economic Notesに掲載された。現在、これをもとに新たな論文を作成中であり、次年度中の完成を目指している。 また本年度、税務大学校との共同研究の応募があり、そこでは租税に関する個表データが扱えるということで申請した。4月に結果が発表され、研究課題の方向性が同じであった中央大学の國枝先生たちのグループと共同で採択されることになった。これを活用して、本研究課題の成果をより充実させたい。
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2019/04 -2023/03 
    Author : 平賀 一希
     
    わが国においては、消費増税の必要性が広く議論されている。消費増税に対する様々な意見がある状況の中で、2019年10月に消費税率を10％に引き上げるとともに、食料品などに対して8％に税率を据え置く軽減税率が導入されることが予定されている。消費課税、特に軽減税率が導入されることで、経済全体だけでなく、産業別の資源配分や価格にも影響を与えることが予想されている。そこで、本研究は、①中間投入財など財が複数存在する経済における消費課税のあり方として従価税と従量税のどちらが望ましいのか、②複数財が存在する経済において消費税率はすべき一律にすべきか、ないしは異なる税率を設定すべきか、③消費増税前後における各財の生産、価格がどの程度変化するかの３つのテーマについて、産業組織論における寡占理論や動学的一般均衡モデルを用いた理論分析、および産業別価格・物価指数データを用いた実証分析を試みる。 本研究では、消費税に関する理論研究を進めることにより、課税理論についての知見を深め、マクロモデルに税制を含める際の新たな論点を提示する。具体的には、予期された消費増税ショックに対する物価指数および産業別の影響を通時的に見ていくことが考えられる。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2017/04 -2021/03 
    Author : Miyazaki Kenji
     
    This research project has produced several papers in both fiscal and monetary policy aspects. On the fiscal side, one paper uses estimates of average marginal tax rates on factor incomes in Japan to demonstrate that the tax revenue elasticity is greater than 1 without social security deduction and less than 1 with such deductions. It theoretically shows that the tax revenue elasticity is always 1 when tax rate is proportional without deduction and that it deviates from 1 with tax deduction. On the monetary side, another paper uses an industrial-organization model of the banking industry with money creation to examine the effect of conventional and unconventional monetary policy on the money stock. It considers quantitative monetary easing, qualitative monetary easing, and a negative interest rate on excess reserve balances as unconventional monetary policy.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2016/04 -2019/03 
    Author : Hiraga Kazuki
     
    This project investigates effects of fiscal policy on regional and (or) sectoral economic variables in both empirical and theoretical analyses. I obtain the three main research outputs. First output is the investigation of "Wagner's law" in local government. Second is the empirical study of effect of public investment on sectoral stock price returns, and third is the theoretical inspection of consumption tax on final and intermediate goods.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2016/04 -2019/03 
    Author : KOZUKA Masafumi
     
    Our studies developed in this project consist of two categories: macroeconomic analysis and investment, stock price and financial institution. About the former category, we obtained the following evidences; with tax increase shock, desirable target of monetary policy is the price including the consumer tax; Balassa=Samuelson effects had decreased after 1997 in Japan; tax elasticity are different from the type of income due to the tax system. About the latter category, we obtained the following results; the effects of public investment on stock price are noticeable under the zero-interest bound; The situation of financial constrain of small-medium enterprises are different from the area, and we recommend that Japanese government has to introduce the different regulation of credit guarantee system by region.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2013/04 -2016/03 
    Author : KOZUKA Masafumi; HIRAGA Kazuki; FUJII Takao
     
    In this research project, we verify the lending behavior of banking sector to small and medium-sized enterprises (hereafter, SMEs) and investment behavior of SMEs. Regarding the lending behavior for SMEs, we obtained following results. First, bank lending had negative relationship with interest rate, and did not grow in the periods of quantitative easing policy. And second, the lending behavior of shinkin banks is different from that of domestic banks after the periods of quantitative easing policy, for the difference in the basic policy. As for the lending investment behavior of SMEs (mainly manufacturing), we focus on the relationship between exchange rate and investment, for exchange rate is regarded as important factor for manufacturing industries. And the empirical results show that there is little relationship between them.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2011 -2013 
    Author : HIRAGA Kazuki; EGUCHI Masataka
     
    This research investigates the method for evaluating the sustainability of the government debt using dynamic general equilibrium. We obtain the three achievements. First, we explain the weak condition of wide sense of the sustainability using simple economic model. Second, we induce the sustainability condition in both the government debt and economics using overlapped generation model. Finally, we develop the new method for investigating the sustainability connecting fiscal stabilization rule and statistical methods.

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