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Martingales and arbitrage in securities markets with transaction costs


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  • Kallal, Hedi
  • Jouini, Elyès
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    We derive the implications from the absence of arbitrage in dynamic securities markets with bid-ask spreads. The absence of arbitrage is equivalent to the existence of at least an equivalent probability measure that transforms some process between the bid and the ask price processes of traded securities into a martingale. The martingale measures can be interpreted as possible linear pricing rules and can be used to determine the investment opportunities available in such an economy. The minimum cost at which a contingent claim can be obtained through securities trading is its largest expected value with respect to the martingale measures.

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    Bibliographic Info

    Paper provided by Paris Dauphine University in its series Economics Papers from University Paris Dauphine with number 123456789/5630.

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    Date of creation: Jun 1995
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    Publication status: Published in Journal of Economic Theory, 1995, Vol. 66, no. 1. pp. 178-197.Length: 19 pages
    Handle: RePEc:dau:papers:123456789/5630

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    Keywords: Investment; linear pricing rules; bid-ask spreads;

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