A note on lower bounds of martingale measure densities

Details A note on lower bounds of martingale measure densities A note on lower bounds of martingale measure densities

2005-05-19

arxiv.org/abs/math/0505411v1

Mathematics

Functional Analysis

9 pages

Scientific paper

For a given element $f\in L^1$ and a convex cone $C\subset L^\infty$, $C\cap L^\infty_+=\{0\}$ we give necessary and sufficient conditions for the existence of an element $g\ge f$ lying in the polar of $C$. This polar is taken in $(L^\infty)^*$ and in $L^1$. In the context of mathematical finance the main result concerns the existence of martingale measures, whose densities are bounded from below by prescribed random variable.

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