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The mean–variance relation: A 24-hour story

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  • Wang, Wenzhao

Abstract

This paper investigates the mean–variance relation during different time periods within trading days. We reveal that there is a positive mean–variance relation when the stock market is closed (i.e., overnight), but the positive relation is distorted when the market is open (i.e., intraday). The evidence offers a new explanation for the weak risk-return tradeoff in stock markets.

Suggested Citation

  • Wang, Wenzhao, 2021. "The mean–variance relation: A 24-hour story," Economics Letters, Elsevier, vol. 208(C).
    • Handle: RePEc:eee:ecolet:v:208:y:2021:i:c:s016517652100330x
    DOI: 10.1016/j.econlet.2021.110053
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    References listed on IDEAS

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    More about this item

    Keywords

    Mean–variance relation; Overnight return; Risk-return tradeoff;
    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
    • G41 - Financial Economics - - Behavioral Finance - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making in Financial Markets

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