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Equilibrium Pricing in Incomplete Markets under Translation Invariant Preferences

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  • Patrick Cheridito
  • Ulrich Horst
  • Michael Kupper
  • Traian A. Pirvu
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    Abstract

    We provide results on the existence and uniqueness of equilibrium in dynamically incomplete financial markets in discrete time. Our framework allows for heterogeneous agents, unspanned random endowments and convex trading constraints. In the special case where all agents have preferences of the same type and all random endowments are replicable by trading in the financial market we show that a one-fund theorem holds and give an explicit expression for the equilibrium pricing kernel. If the underlying noise is generated by finitely many Bernoulli random walks, the equilibrium dynamics can be described by a system of coupled backward stochastic difference equations, which in the continuous-time limit becomes a multi-dimensional backward stochastic differential equation. If the market is complete in equilibrium, the system of equations decouples, but if not, one needs to keep track of the prices and continuation values of all agents to solve it. As an example we simulate option prices in the presence of stochastic volatility, demand pressure and short-selling constraints.

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    Bibliographic Info

    Paper provided by Sonderforschungsbereich 649, Humboldt University, Berlin, Germany in its series SFB 649 Discussion Papers with number SFB649DP2011-083.

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    Length: 48 pages
    Date of creation: Nov 2011
    Date of revision:
    Handle: RePEc:hum:wpaper:sfb649dp2011-083

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    Related research

    Keywords: Competitive equilibrium; incomplete markets; heterogenous agents; trading constraints; backward stochastic difference equations;

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    References

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