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Why Can Margin Requirements Increase Volatility and Benefit Margin Constrained Investors?

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  • Yajun Wang

Abstract

We propose a tractable equilibrium model to examine how margin requirements affect asset prices, market volatility, and market participants’ welfare. We show that margin requirements can have opposite effects on market volatility when they constrain different investors and thus can help explain why empirical results have been mixed. Contrary to one of the main regulatory goals, we find that even though margin requirements restrict borrowing and shorting, they can significantly increase market volatility. In addition, margin requirements can make margin constrained investors better off and can lead to a greater return reversal. Our analysis also provides new empirically testable implications.

Suggested Citation

  • Yajun Wang, 2016. "Why Can Margin Requirements Increase Volatility and Benefit Margin Constrained Investors?," Review of Finance, European Finance Association, vol. 20(4), pages 1449-1485.
    • Handle: RePEc:oup:revfin:v:20:y:2016:i:4:p:1449-1485.
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    File URL: http://hdl.handle.net/10.1093/rof/rfv041
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    References listed on IDEAS

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    1. Hardouvelis, Gikas A, 1990. "Margin Requirements, Volatility, and the Transitory Components of Stock Prices," American Economic Review, American Economic Association, vol. 80(4), pages 736-762, September.
    2. Thierry Foucault & David Sraer & David J. Thesmar, 2011. "Individual Investors and Volatility," Journal of Finance, American Finance Association, vol. 66(4), pages 1369-1406, August.
    3. Grossman, Sanford J & Stiglitz, Joseph E, 1980. "On the Impossibility of Informationally Efficient Markets," American Economic Review, American Economic Association, vol. 70(3), pages 393-408, June.
    4. Darrell Duffie, 2010. "Presidential Address: Asset Price Dynamics with Slow‐Moving Capital," Journal of Finance, American Finance Association, vol. 65(4), pages 1237-1267, August.
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    Cited by:

    1. Yanxi Li & Siu Kai Choy & Mingzhu Wang, 2022. "The potential built‐in supply effect from margin trading in the Chinese stock market," The Financial Review, Eastern Finance Association, vol. 57(4), pages 835-861, November.
    2. Hong Liu & Yajun Wang, 2019. "Asset Pricing Implications of Short-Sale Constraints in Imperfectly Competitive Markets," Management Science, INFORMS, vol. 65(9), pages 4422-4439, September.
    3. Kryzanowski, Lawrence & Perrakis, Stylianos & Zhong, Rui, 2021. "Financial oligopolies and parallel exclusion in the credit default swap markets," Journal of Financial Markets, Elsevier, vol. 56(C).
    4. Váradi, Kata & Ladoniczki, Sára Kata, 2018. "Elszámolóházak alapbiztosítéki követelményeinek számítási módszertana [Numerical methodology in the basic insurance requirements of clearing houses]," Közgazdasági Szemle (Economic Review - monthly of the Hungarian Academy of Sciences), Közgazdasági Szemle Alapítvány (Economic Review Foundation), vol. 0(7), pages 780-809.

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