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Margin Rules, Informed Trading in Derivatives and Price Dynamics

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  • K. John
  • A. Koticha
  • R. Narayanan

Abstract

We analyze the impact of option trading and margin rules on the behavior of informed traders and on the microstructure of stock and option markets. In the absence of binding margin requirements, the introduction of an options market causes informed traders to exhibit a relative trading bias towards the stock because of its greater information sensitivity. In turn, this widens the stock's bid-ask spread. But when informed traders are subject to margin requirements, their bias towards the stock is enhanced or mitigated depending on the leverage provided by the option relative to the stock, leading to wider or narrower stock bid-ask spreads. The introduction of option trading, with or without margin requirements, unambiguously improves the informational efficiency of stock prices. Margin rules improve market efficiency when stock margins and options margins (relative to stock margins) are sufficiently large or small but not when they are of moderate size.

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  • K. John & A. Koticha & R. Narayanan, "undated". "Margin Rules, Informed Trading in Derivatives and Price Dynamics," New York University, Leonard N. Stern School Finance Department Working Paper Seires 99-047, New York University, Leonard N. Stern School of Business-.
    • Handle: RePEc:fth:nystfi:99-047
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    References listed on IDEAS

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    Cited by:

    1. Koedijk, Kees & de Jong, Cyriel & Schnitzlein, Charles, 2002. "Stock Market Quality in the Prescence of a Traded Option," CEPR Discussion Papers 3173, C.E.P.R. Discussion Papers.

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