Heliyon
Volume 9, Issue 4, April 2023, e15084
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Research article
Stock market responses to COVID-19: The behaviors of mean reversion, dependence and persistence

https://doi.org/10.1016/j.heliyon.2023.e15084Get rights and content
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Abstract

We examine stock market responses during the COVID-19 pandemic period using fractional integration techniques. The evidence suggests that stock markets generally follow a synchronized movement before and the stages of the pandemic shocks. We find while mean reversion significantly declines, the degree of persistence and dependence has been increased in the majority of the stock market indices in whole sample analysis covering the period of August 02, 2019 and July 09, 2020. This outcome implies increasing integration and possibly declining benefits of diversification for the global stock portfolio management.

Keywords

Coronavirus
Stock markets
Fractional integration
Long memory
Mean reversion

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Comments from the Editor and two anonymous reviewers are gratefully acknowledged.