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Extension theorems for linear operators on $L_\infty$ and application to price systems

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  • Jocelyne Bion-Nadal
  • Giulia Di Nunno

Abstract

In an $L_\infty$-framework, we present a few extension theorems for linear operators. We focus the attention on majorant preserving and sandwich preserving types of extensions. These results are then applied to the study of price systems derived by a reasonable restriction of the class of equivalent martingale measures applicable. First we consider equivalent martingale measures with bounds on densities and the corresponding prices bounded by linear minorant and majorant. Then we consider prices bounded by bid-ask dynamics. Finally we study price systems consistent with no-good-deal pricing measures for given bounds on the Sharpe ratio. Within this study we introduce the definition of dynamic no-good-deal pricing measure.

Suggested Citation

  • Jocelyne Bion-Nadal & Giulia Di Nunno, 2011. "Extension theorems for linear operators on $L_\infty$ and application to price systems," Papers 1102.5501, arXiv.org.
    • Handle: RePEc:arx:papers:1102.5501
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    References listed on IDEAS

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    1. Freddy Delbaen & Shige Peng & Emanuela Rosazza Gianin, 2010. "Representation of the penalty term of dynamic concave utilities," Finance and Stochastics, Springer, vol. 14(3), pages 449-472, September.
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