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Asymmetric volatility structure of equity returns: Evidence from an emerging market

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  • Umar, Muhammad
  • Mirza, Nawazish
  • Rizvi, Syed Kumail Abbas
  • Furqan, Mehreen

Abstract

This study aims to evaluate the volatility structure of equity returns in an emerging market. We test the persistence and asymmetries in the volatility structure of equity returns in the Pakistan stock exchange (PSX) between 2006 and 2020. The volatility dynamics are assessed using multiple symmetric and asymmetric variants of GARCH family models. We also introduce News Impact Curves to analyze the presence of asymmetries in the volatility of the returns. Our results demonstrate that the volatility is persistent only in daily returns but not in weekly and monthly returns. Similarly, asymmetries were observed for daily returns implying that news arriving in the market continuously does impact investors' sentiment and behavior. However, this phenomenon subdues when the period is extended, reflecting that PSX is efficient in semi-strong form. These findings have important implications for asset management, instrument pricing, cost of capital estimations, and portfolio optimization.

Suggested Citation

  • Umar, Muhammad & Mirza, Nawazish & Rizvi, Syed Kumail Abbas & Furqan, Mehreen, 2023. "Asymmetric volatility structure of equity returns: Evidence from an emerging market," The Quarterly Review of Economics and Finance, Elsevier, vol. 87(C), pages 330-336.
    • Handle: RePEc:eee:quaeco:v:87:y:2023:i:c:p:330-336
    DOI: 10.1016/j.qref.2021.04.016
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    More about this item

    Keywords

    GARCH; Asymmetric volatility; News impact curves; Equity returns;
    All these keywords.

    JEL classification:

    • C58 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Financial Econometrics
    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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