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arXiv 1602.01070q-fin.MFmath.PR
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带交易成本和随机内点的效用最大化的一个注记:数值模型和凸对偶

A note on utility maximization with transaction costs and random endoment: numéraire-based model and convex duality

Lingqi Gu, Yiqing Lin, Junjian Yang

摘要:

本文研究了有比例交易成本和有界随机禀赋条件下终端财富的效用最大化问题。特别是,我们将自己限制在基于数值的模型中,并使用仅支持R+的效用函数。在一致价格系统存在的假设和自然正则性条件下,建立了标准的凸对偶结果。准确地说,我们首先将与一致价格系统相关的鞅密度的集合的对偶域扩大到一组可加测度;然后效用最大化问题的对偶形式可以被视为Cvitanić-Schachermayer-Wang(2001)的论文在比例交易成本下的扩展。

英文摘要:

In this note, we study the utility maximization problem on the terminal wealth under proportional transaction costs and bounded random endowment. In particular, we restrict ourselves to the numéraire-based model and work with utility functions only supporting R+. Under the assumption of existence of consistent price systems and natural regularity conditions, standard convex duality results are established. Precisely, we first enlarge the dual domain from the collection of martingale densities associated with consistent price systems to a set of finitely additive measures; then the dual formulation of the utility maximization problem can be regarded as an extension of the paper of Cvitanić-Schachermayer-Wang (2001) to the context under proportional transaction costs.

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