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On derivatives with illiquid underlying and market manipulation

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Author Info

  • Ulrich Horst
  • Felix Naujokat

Abstract

In illiquid markets, option traders may have an incentive to increase their portfolio value by using their impact on the dynamics of the underlying. We provide a mathematical framework to construct optimal trading strategies under market impact in a multi-player framework by introducing strategic interactions into the model of Almgren [Appl. Math. Finance, 2003, 10(1), 1-18]. Specifically, we consider a financial market model with several strategically interacting players who hold European contingent claims and whose trading decisions have an impact on the price evolution of the underlying. We establish the existence and uniqueness of equilibrium results for risk-neutral and CARA investors and show that the equilibrium dynamics can be characterized in terms of a coupled system of possibly nonlinear PDEs. For the linear cost function used by Almgren, we obtain a (semi) closed-form solution. Analysing this solution, we show how market manipulation can be reduced.

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File URL: http://www.tandfonline.com/doi/abs/10.1080/14697688.2011.552517
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Bibliographic Info

Article provided by Taylor & Francis Journals in its journal Quantitative Finance.

Volume (Year): 11 (2011)
Issue (Month): 7 ()
Pages: 1051-1066

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Handle: RePEc:taf:quantf:v:11:y:2011:i:7:p:1051-1066

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Related research

Keywords: Liquidity modelling; Derivatives pricing; Stochastic models; Game theory; Market manipulation;

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