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Insider trading with penalties

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  • Carré, Sylvain
  • Collin-Dufresne, Pierre
  • Gabriel, Franck

Abstract

We consider a Kyle (1985) one-period model where insider trading may be subject to a penalty that is increasing in trade size. We characterize the solution - the equilibrium price and optimal trading strategy - explicitly and establish existence and uniqueness for an arbitrary penalty function for the case of uniformly distributed noise. We use this framework to capture the difference between legal and illegal insider trading, and identify the set of ‘efficient penalty functions’ that would be optimal for a regulator that seeks to minimize expected uninformed traders' losses for a given level of price informativeness. Simple policies consisting of a fixed penalty upon nonzero trades belong to this set and can be used to implement any efficient outcome. Using numerical analysis, we show the robustness of our results to different distributional assumptions.

Suggested Citation

  • Carré, Sylvain & Collin-Dufresne, Pierre & Gabriel, Franck, 2022. "Insider trading with penalties," Journal of Economic Theory, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:jetheo:v:203:y:2022:i:c:s0022053122000515
    DOI: 10.1016/j.jet.2022.105461
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    Cited by:

    1. Daher, Wassim & Karam, Fida & Ahmed, Naveed, 2023. "Insider Trading with Semi-Informed Traders and Information Sharing: The Stackelberg Game," MPRA Paper 118138, University Library of Munich, Germany.
    2. Wassim Daher & Fida Karam & Naveed Ahmed, 2023. "Insider Trading with Semi-Informed Traders and Information Sharing: The Stackelberg Game," Mathematics, MDPI, vol. 11(22), pages 1-16, November.
    3. Umut c{C}etin, 2023. "Insider trading with penalties, entropy and quadratic BSDEs," Papers 2311.12743, arXiv.org.

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    More about this item

    Keywords

    Kyle model; Non-linear equilibria; Market microstructure; Insider trading; Market regulation; Efficient penalties;
    All these keywords.

    JEL classification:

    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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