Modeling financial assets without semimartingales

Details Modeling financial assets without semimartingales Modeling financial assets without semimartingales

2006-06-26

arxiv.org/abs/math/0606642v1

Mathematics

Probability

53 pages

Scientific paper

This paper does not suppose a priori that the evolution of the price of a financial asset is a semimartingale. Since possible strategies of investors are self-financing, previous prices are forced to be finite quadratic variation processes. The non-arbitrage property is not excluded if the class ${\cal A}$ of admissible strategies is restricted. The classical notion of martingale is replaced with the notion of ${\cal A}$-martingale. A calculus related to ${\cal A}$-martingales with some examples is developed. Some applications to the maximization of the utility of an insider are expanded.

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