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Examining the adaptive market hypothesis with calendar effects: International evidence and the impact of COVID-19

Author

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  • Bassiouny, Aliaa
  • Kiryakos, Mariam
  • Tooma, Eskandar

Abstract

This study examines whether the adaptive market hypothesis (AMH) explains calendar anomalies across 16 headline stock market indices in 10 markets. We employ the rolling window analysis and estimate a T-GARCH (1,1) for a long time series that includes two years coinciding with the COVID-19 pandemic. Overall, the empirical results reveal that calendar day anomalies across our sample markets exhibit time-varying behavior, evolving through patterns that shift markets between periods of efficiency and inefficiency, thereby providing support for the AMH framework. The results also highlight the calendar anomalies that reappeared after the onset of the COVID-19 pandemic across international markets.

Suggested Citation

  • Bassiouny, Aliaa & Kiryakos, Mariam & Tooma, Eskandar, 2023. "Examining the adaptive market hypothesis with calendar effects: International evidence and the impact of COVID-19," Global Finance Journal, Elsevier, vol. 56(C).
    • Handle: RePEc:eee:glofin:v:56:y:2023:i:c:s1044028322000795
    DOI: 10.1016/j.gfj.2022.100777
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    Citations

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    Cited by:

    1. Onur Özdemir & Anoop S. Kumar, 2024. "Dynamic Efficiency and Herd Behavior During Pre- and Post-COVID-19 in the NFT Market: Evidence from Multifractal Analysis," Computational Economics, Springer;Society for Computational Economics, vol. 63(3), pages 1255-1279, March.
    2. Chien-Liang Chiu & Paoyu Huang & Min-Yuh Day & Yensen Ni & Yuhsin Chen, 2024. "Mastery of “Monthly Effects”: Big Data Insights into Contrarian Strategies for DJI 30 and NDX 100 Stocks over a Two-Decade Period," Mathematics, MDPI, vol. 12(2), pages 1-22, January.

    More about this item

    Keywords

    Adaptive market hypothesis; Day-of-the-week effect; Calendar anomalies; Rolling window analysis; T-GARCH model; COVID-19;
    All these keywords.

    JEL classification:

    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets

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