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Shorting in Speculative Markets

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  • MARCEL NUTZ
  • JOSÉ A. SCHEINKMAN

Abstract

In models of trading with heterogeneous beliefs following Harrison‐Kreps, short selling is prohibited and agents face constant marginal costs‐of‐carry. The resale option guarantees that prices exceed buy‐and‐hold prices and the difference is identified as a bubble. We propose a model where risk‐neutral agents face asymmetric increasing marginal costs on long and short positions. Here, agents also value an option to delay, and a Hamilton‐Jacobi‐Bellman equation quantifies the influence of costs on prices. An unexpected decrease in shorting costs may deflate a bubble, linking financial innovations that facilitated shorting of mortgage‐backed securities to the collapse of prices.

Suggested Citation

  • Marcel Nutz & José A. Scheinkman, 2020. "Shorting in Speculative Markets," Journal of Finance, American Finance Association, vol. 75(2), pages 995-1036, April.
    • Handle: RePEc:bla:jfinan:v:75:y:2020:i:2:p:995-1036
    DOI: 10.1111/jofi.12871
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    References listed on IDEAS

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    Cited by:

    1. Julien Pénasse & Luc Renneboog & José A Scheinkman & Stijn Van Nieuwerburgh, 2021. "When a Master Dies: Speculation and Asset Float [Optimal financial crises]," The Review of Financial Studies, Society for Financial Studies, vol. 34(8), pages 3840-3879.
    2. Peter Bank & Ibrahim Ekren & Johannes Muhle‐Karbe, 2021. "Liquidity in competitive dealer markets," Mathematical Finance, Wiley Blackwell, vol. 31(3), pages 827-856, July.
    3. Qin, Meng & Mirza, Nawazish & Su, Chi-Wei & Umar, Muhammad, 2023. "Exploring Bubbles in the Digital Economy: The Case of China," Global Finance Journal, Elsevier, vol. 57(C).
    4. Johannes Muhle‐Karbe & Marcel Nutz & Xiaowei Tan, 2020. "Asset pricing with heterogeneous beliefs and illiquidity," Mathematical Finance, Wiley Blackwell, vol. 30(4), pages 1392-1421, October.
    5. Sheng, Jiliang & Xu, Si & An, Yunbi & Yang, Jun, 2022. "Dynamic asset pricing in delegated investment: An investigation from the perspective of heterogeneous beliefs of institutional and retail investors," Economic Modelling, Elsevier, vol. 107(C).
    6. Yves Achdou & Charles Bertucci & Jean-Michel Lasry & Pierre-Louis Lions & Antoine Rostand & José A. Scheinkman, 2022. "A class of short-term models for the oil industry that accounts for speculative oil storage," Finance and Stochastics, Springer, vol. 26(3), pages 631-669, July.

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