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Uncertainty, Fear and Herding Behavior: Evidence from Size-Ranked Portfolios

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  • David Y. Aharon

Abstract

This study is aimed at testing the relationship between investors’ uncertainty reflected by market sentiment and herding behavior phenomenon. Using data for 1990–2019 for size-ranked portfolios, the evidence documented here indicates that herding is strongly related to market sentiment as captured by the CBOE’s Volatility Index, the VIX. The results indicate that the VIX, which is also recognized as the fear index, has a substantial impact on herding across all groups and subgroups of size-ranked portfolios. Overall, the effect of VIX exists in most of the quantiles of the cross-sectional absolute deviation distribution. In this context, the scale and magnitude of the fear index impact rises toward the highest parts of the herding distribution. We also show that herding behavior is more pronounced when the market is overwhelmed by sentiment. The findings have several practical implications for investment professionals such as portfolio managers, investment officers, analysts, and other market participants. They also provide academic insights for researchers dealing with market efficiency and investors’ behavior.

Suggested Citation

  • David Y. Aharon, 2021. "Uncertainty, Fear and Herding Behavior: Evidence from Size-Ranked Portfolios," Journal of Behavioral Finance, Taylor & Francis Journals, vol. 22(3), pages 320-337, July.
    • Handle: RePEc:taf:hbhfxx:v:22:y:2021:i:3:p:320-337
    DOI: 10.1080/15427560.2020.1774887
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    Cited by:

    1. Reveley Callum & Shanaev Savva & Bin Yu & Panta Humnath & Ghimire Binam, 2023. "Analyst herding—whether, why, and when? Two new tests for herding detection in target forecast prices," Economics and Business Review, Sciendo, vol. 9(4), pages 25-55, December.
    2. An Pham Ngoc Nguyen & Thomas Conlon & Martin Crane & Marija Bezbradica, 2024. "Herding Unmasked: Insights into Cryptocurrencies, Stocks and US ETFs," Papers 2407.08069, arXiv.org.
    3. Ren, Boru & Lucey, Brian, 2023. "Herding in the Chinese renewable energy market: Evidence from a bootstrapping time-varying coefficient autoregressive model," Energy Economics, Elsevier, vol. 119(C).
    4. Costa, Filipe & Fortuna, Natércia & Lobão, Júlio, 2024. "Herding states and stock market returns," Research in International Business and Finance, Elsevier, vol. 68(C).

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