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Robust price bounds for the forward starting straddle

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  • David Hobson
  • Martin Klimmek

Abstract

We consider the problem of giving a robust, model-independent, lower bound on the price of a forward starting straddle with payoff $|F_{T_{1}} - F_{T_{0}}|$ , where 0>T 0 >T 1 . Rather than assuming a model for the underlying forward price (F t ) t≥0 , we assume that call prices for maturities T 0 >T 1 are given and hence that the marginal laws of the underlying are known. The primal problem is to find the model that is consistent with the observed call prices and for which the price of the forward starting straddle is minimised. The dual problem is to find the cheapest semi-static subhedge. Under an assumption on the supports of the marginal laws, but no assumption that the laws are atom-free or in any other way regular, we derive explicit expressions for the coupling which minimises the price of the option, and the form of the semi-static subhedge. Copyright Springer-Verlag Berlin Heidelberg 2015

Suggested Citation

  • David Hobson & Martin Klimmek, 2015. "Robust price bounds for the forward starting straddle," Finance and Stochastics, Springer, vol. 19(1), pages 189-214, January.
    • Handle: RePEc:spr:finsto:v:19:y:2015:i:1:p:189-214
    DOI: 10.1007/s00780-014-0249-4
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    References listed on IDEAS

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    More about this item

    Keywords

    Martingale coupling; Martingale optimal transport; Model-independent bounds; Static hedging; forward starting straddle; 91G20; 60G42; G11; G13;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G13 - Financial Economics - - General Financial Markets - - - Contingent Pricing; Futures Pricing

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