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Margin lending and stock market volatility

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  • Peter Fortune

Abstract

Margin loans have long been associated in the popular mind with instability in security markets, and the potential for margin lending to exacerbate the amplitude of cycles in stock prices has received considerable attention in the years since the Crash of 1929. Despite the many empirical studies of the association between margin loans or margin requirements and the volatility of stock returns, there has been no definitive answer, and the consensus among financial economists is that margin lending plays little, if any, role in shaping the probability distribution of returns on common stocks. Perhaps as a result of this, the Federal Reserve System's margin requirements have not been changed since 1974. ; This study addresses the role of margin requirements from the vantage points of economic theory and the historical record. The author reviews many of the key empirical studies of the link between margin requirements and stock prices. Economic theory suggests many reasons that the link might be weak, and this is supported by many of the empirical studies. ; The author estimates a model of the returns on common stocks in the period 1975-2001. The model includes information on the amount of margin debt outstanding. He concludes that margin loans are a statistically significant factor in the determination of stock returns, and that the effect is stronger and more reliable for the NASDAQ Composite index than for the S&P 500 index. However, the economic significance of margin debt is so low that this study is not able to support a return to the active margin policy that existed prior to 1974.

Suggested Citation

  • Peter Fortune, 2001. "Margin lending and stock market volatility," New England Economic Review, Federal Reserve Bank of Boston, pages 3-25.
  • Handle: RePEc:fip:fedbne:y:2001:p:3-25:n:4
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    References listed on IDEAS

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    3. Wu, Wei-Hwa, 2021. "Extendible stock loan," The North American Journal of Economics and Finance, Elsevier, vol. 58(C).
    4. Bernard McSherry & Berry K. Wilson, 2020. "Margin practices and requirements during the National Banking Era: An early example of macro‐prudential regulation," Review of Financial Economics, John Wiley & Sons, vol. 38(S1), pages 210-225, March.
    5. Guanghui Huang & Weiqing Gu & Wenting Xing & Hongyu Li, 2012. "Active margin system for margin loans using cash and stock as collateral and its application in Chinese market," Papers 1202.5180, arXiv.org.
    6. Brumm, Johannes & Grill, Michael & Kubler, Felix & Schmedders, Karl, 2015. "Margin regulation and volatility," Journal of Monetary Economics, Elsevier, vol. 75(C), pages 54-68.
    7. Guanghui Huang & Wenting Xin & Weiqing Gu, 2012. "Active margin system for margin loans and its application in Chinese market: using cash and randomly selected stock as collateral," Papers 1202.4913, arXiv.org, revised Feb 2012.
    8. John H. Huston & Roger W. Spencer, 2009. "Speculative excess and the Federal Reserve's response," Studies in Economics and Finance, Emerald Group Publishing Limited, vol. 26(1), pages 46-61, March.
    9. Zhang, Ting & Li, Honggang, 2013. "Buying on margin, selling short in an agent-based market model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 392(18), pages 4075-4082.
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    11. Guo, Ruqiang & Liu, Linjie & Liu, Yuyuan & Zhang, Liang, 2024. "Evolution of trust in the N-player trust game with the margin system," Applied Mathematics and Computation, Elsevier, vol. 473(C).
    12. Joyce Hsieh & Chien-Chung Nieh, 2010. "An overview of Asian equity markets," Asian-Pacific Economic Literature, The Crawford School, The Australian National University, vol. 24(2), pages 19-51, November.
    13. Michael Grill & Karl Schmedders & Felix Kubler & Johannes Brumm, 2012. "Margin Requirements and Asset Prices," 2012 Meeting Papers 533, Society for Economic Dynamics.
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