اثر عدم قطعیت سیاستی و اقتصادی بر بی‌ثباتی بخش بانکی در بورس اوراق بهادار تهران (رویکرد پارامتر – متغیر زمان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری رشته مدیریت مالی، دانشکده مدیریت، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشیار رشته مدیریت مالی، دانشکده مدیریت، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران

10.22051/jfm.2024.41325.2720

چکیده

هدف اصلی پژوهش حاضر بررسی تاثیر عدم قطعیت (نااطمینانی) اقتصادی و­ سیاست­های دولتی بر بی­ثباتی قیمتی بخش بانکی در  بورس اوراق بهادار تهران با در نظر گرفتن ناپایداری ساختاری در پارامترهای مدل می­باشد. در این راستا، به منظور برآورد نااطمینانی متغیرهای پژوهش، انواع مدل های متقارن، نامتقارن و غیر خطی GARCH برآورد شده و در نهایت بر اساس معیارهای اطلاعاتی و معنی­داری ضرایب عدم تقارن، مدل EGARCH به عنوان الگوی بهینه انتخاب گردید. در ادامه تاثیر شاخص­های نااطمینانی بر بی­ثباتی شاخص بخش بانکی در قالب مدل خودبازگشتی برداری پارامتر متغیر-زمان (TVP-VAR) مورد بررسی قرار گرفت. در این پژوهش از داده­های ماهانه در دوره زمانی 1389:4-1399:6 استفاده شده است. نتایج برآورد نهایی مدل پژوهش حاکی از متغیر بودن ضرایب تاثیر شاخص­های نااطمینانی بر بی­ثباتی بخش بانکی است. به صورتی­که تاثیر عدم قطعیت سیاست­های دولتی (متغیر نااطمینانی درآمدهای مالیاتی) بر بی­ثباتی بخش بانکی در ابتدا منفی و در انتهای دوره مثبت برآورد شده است. بر اساس توابع عکس­العمل آنی (IRF)، تأثیر نااطمینانی تورم به عنوان شاخص نااطمینانی اقتصادی بر بی‌ثباتی بخش بانکی مثبت برآورد شده است. همچنین، تاثیر نااطمینانی سیاست­های دولتی از کانال نااطمینانی نرخ ارز تاثیری مثبت بر تلاطم بخش بانکی در بورس اوراق بهادار داشته­است. با این حال نااطمینانی سیاست­های دولتی بر اساس شاخص نااطمینانی درآمدهای مالیاتی تاثیرگذاری منفی بر بی­ثباتی قیمتی بخش بانکی داشته­است و این تاثیر به تدریج کاهش پیدا کرده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Political and Economic Uncertainty on the Instability of the Banking Sector in Tehran Stock Exchange (time-varying parameter approach)

نویسندگان [English]

  • Davoud Hasani 1
  • Mirfeiz Fallahshams 2
  • Gholamreza Zomorodian 2
1 PhD in Financial Management, Department of Management, Central Tehran Branch, Islamic Azad University, Tehran, Iran
2 Associate Professor, Financial Management, Central Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The main purpose of this study is to investigate the impact of economic uncertainty and government policies on the price volatility of the banking sector in the Tehran Stock Exchange, considering the structural instability in the model parameters. In this regard, in order to estimate the uncertainty of the variables, a variety of symmetric, asymmetric and non-linear GARCH models were estimated, and finally, based on the information criteria and the significance of the asymmetry coefficients, the EGARCH model was selected as the optimal model. In the following, the effect of uncertainty Indicators on the instability of the banking sector index was investigated by the time-varying parameter autoregressive (TVP-VAR). In this research, monthly data were used in the period of 2010:7-2020:9. The results of the final estimation of the research model indicate that the impact coefficients of uncertainty indicators on the instability of the banking sector are variable. In such a way that the effect of the uncertainty of government policies (uncertainty of tax revenues) on the instability of the banking sector estimated negative at the beginning and positive at the end of the period. Based on the impulse response function (IRF), the effect of inflation uncertainty as the indicator of economic uncertainty on the instability of the banking sector is positive. Also, the impact of government policy uncertainty through the exchange rate uncertainty channel has had a positive impact on the volatility of the banking sector in the stock exchange. However, the uncertainty of government policies based on the uncertainty index of tax revenues has had a negative impact on the price volatility of the banking sector, and this impact has gradually decreased.

کلیدواژه‌ها [English]

  • Banking sector instability
  • Economic uncertainty
  • Government policy uncertainty
  • Time-varying parameter autoregressive (TVP-VAR)
 
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