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arXiv 1102.2050math.PRq-fin.PR
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关于不含半鞅的金融资产的随机分析

On stochastic calculus related to financial assets without semimartingales

Rosanna Coviello, Cristina Di Girolami, Francesco Russo

摘要:

本文并没有先验地假设金融资产价格的演变是半鞅。由于投资者的可能策略是自融资的,以前的价格被迫是有限的二次变化过程。如果容许策略类$\mathcal{A}$是有限制的,则不排除无套利性质。用$\mathcal{A}$ -鞅的概念代替了经典鞅的概念。给出了一个与$\mathcal{A}$ -鞅有关的微积分,并给出了一些例子.无套利,可行性,套期保值和内部人效用最大化的一些应用程序进行了扩展。最后我们重新讨论了Bender-Sottinen-Valkeila型无套利条件。

英文摘要:

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 $\mathcal{A}$ of admissible strategies is restricted. The classical notion of martingale is replaced with the notion of $\mathcal{A}$-martingale. A calculus related to $\mathcal{A}$-martingales with some examples is developed. Some applications to no-arbitrage, viability, hedging and the maximization of the utility of an insider are expanded. We finally revisit some no arbitrage conditions of Bender-Sottinen-Valkeila type.

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