Thomas Goll () (Institut für Mathematische Stochastik, Universität Freiburg i. Br., Eckerstraße 1, 79104 Freiburg i. Br., Germany Manuscript) Ludger Rüschendorf () (Institut für Mathematische Stochastik, Universität Freiburg i. Br., Eckerstraße 1, 79104 Freiburg i. Br., Germany Manuscript)
Abstract
In this paper we give a characterization of minimal distance martingale measures with respect to f-divergence distances in a general semimartingale market model. We provide necessary and sufficient conditions for minimal distance martingale measures and determine them explicitly for exponential Lévy processes with respect to several classical distances. It is shown that the minimal distance martingale measures are equivalent to minimax martingale measures with respect to related utility functions and that optimal portfolios can be characterized by them. Related results in the context of continuous-time diffusion models were first obtained by He and Pearson (1991b) and Karatzas et al. (1991) and in a general semimartingale setting by Kramkov and Schachermayer (1999). Finally parts of the results are extended to utility-based hedging.
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Find related papers by 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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