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On the support of extremal martingale measures with given marginals: the countable case

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  • Luciano Campi
  • Claude Martini

Abstract

We investigate the supports of extremal martingale measures with pre-specified marginals in a two-period setting. First, we establish in full generality the equivalence between the extremality of a given measure $Q$ and the denseness in $L^1(Q)$ of a suitable linear subspace, which can be seen in a financial context as the set of all semi-static trading strategies. Moreover, when the supports of both marginals are countable, we focus on the slightly stronger notion of weak exact predictable representation property (henceforth, WEP) and provide two combinatorial sufficient conditions, called "2-link property" and "full erasability", on how the points in the supports are linked to each other for granting extremality. When the support of the first marginal is a finite set, we give a necessary and sufficient condition for the WEP to hold in terms of the new concepts of $2$-net and deadlock. Finally, we study the relation between cycles and extremality.

Suggested Citation

  • Luciano Campi & Claude Martini, 2016. "On the support of extremal martingale measures with given marginals: the countable case," Papers 1607.07197, arXiv.org, revised Mar 2019.
    • Handle: RePEc:arx:papers:1607.07197
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    References listed on IDEAS

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    1. Beatrice Acciaio & Martin Larsson & Walter Schachermayer, 2016. "The space of outcomes of semi-static trading strategies need not be closed," Papers 1606.00631, arXiv.org.
    2. Alfred Galichon & Pierre Henri-Labordère & Nizar Touzi, 2013. "A stochastic control approach to No-Arbitrage bounds given marginals, with an application to Lookback options," Sciences Po publications info:hdl:2441/5rkqqmvrn4t, Sciences Po.
    3. Luciano Campi, 2004. "Arbitrage and completeness in financial markets with given N-dimensional distributions," Decisions in Economics and Finance, Springer;Associazione per la Matematica, vol. 27(1), pages 57-80, August.
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    Cited by:

    1. Acciaio, Beatrice & Larsson, Martin, 2017. "Semi-static completeness and robust pricing by informed investors," LSE Research Online Documents on Economics 68502, London School of Economics and Political Science, LSE Library.

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