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arXiv 0901.2070q-fin.PMq-fin.CP
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Lévy市场中状态依赖的效用最大化

State-dependent utility maximization in Lévy markets

Jose E. Figueroa-Lopez, Jin Ma

摘要:

我们重温默顿的投资组合优化问题下有界状态依赖的效用函数,在市场驱动的莱维过程$Z$扩展Karatzas等人的结果。等人(1991)和Kunita(2003)。这个问题是解决使用一个双变分问题,因为它是习惯上做的非马尔可夫模型。这里的一个主要特征是对偶问题的域享有一个明确的“参数化”,建立在Föllmer和Kramkov(1997)的非负上鞅的乘法可选分解之上。作为获得表示结果的关键步骤,我们证明了积分关于泊松随机测度的封闭性,这是一个有趣的结果,它本身扩展了Mémin(1980)关于固定半鞅积分的类似性质。在(i)$Z$的Lévy测度是原子测度且原子个数有限的情况下,或(ii)$ΔS_{t}/S_{t^{-}}=ζ_{t} \vartheta(ΔZ_{t})$是过程$ζ$和确定性函数$\vartheta$的情况下,我们明确地刻画了容许交易策略,并证明了其对偶解是风险中性的局部鞅.

英文摘要:

We revisit Merton's portfolio optimization problem under boun-ded state-dependent utility functions, in a market driven by a Lévy process $Z$ extending results by Karatzas et. al. (1991) and Kunita (2003). The problem is solved using a dual variational problem as it is customarily done for non-Markovian models. One of the main features here is that the domain of the dual problem enjoys an explicit "parametrization", built on a multiplicative optional decomposition for nonnegative supermartingales due to Föllmer and Kramkov (1997). As a key step in obtaining the representation result we prove a closure property for integrals with respect to Poisson random measures, a result of interest on its own that extends the analog property for integrals with respect to a fixed semimartingale due to Mémin (1980). In the case that (i) the Lévy measure of $Z$ is atomic with a finite number of atoms or that (ii) $ΔS_{t}/S_{t^{-}}=ζ_{t} \vartheta(ΔZ_{t})$ for a process $ζ$ and a deterministic function $\vartheta$, we explicitly characterize the admissible trading strategies and show that the dual solution is a risk-neutral local martingale.

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