A minimality property of the minimal martingale measure
Let X be a continuous adapted process for which there exists an equivalent local martingale measure (ELMM). The minimal martingale measure is the unique ELMM for X with the property that local P-martingales strongly orthogonal to the P-martingale part of X are also local -martingales. We prove that if exists, it minimizes the reverse relative entropy H(PQ) over all ELMMs Q for X. A counterexample shows that the assumption of continuity cannot be dropped.
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Volume (Year): 42 (1999)
Issue (Month): 1 (March)
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References listed on IDEAS
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- Norbert Hofmann & Eckhard Platen & Martin Schweizer, 1992.
"Option Pricing Under Incompleteness and Stochastic Volatility,"
Wiley Blackwell, vol. 2(3), pages 153-187.
- N. Hofmann & E. Platen & M. Schweizer, 1992. "Option Pricing under Incompleteness and Stochastic Volatility," Discussion Paper Serie B 209, University of Bonn, Germany.