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arXiv 1407.3154q-fin.PM
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给定清算时间分布的资产的投资组合优化

Portfolio optimization in the case of an asset with a given liquidation time distribution

Ljudmila A. Bordag, Ivan P. Yamshchikov, Dmitry Zhelezov

摘要:

对含有低流动性资产的投资组合进行管理是一个繁琐的问题。买方提出的价格可能与卖方估计的账面价值相差很大,另一方面,卖方不能立即清算他的投资组合,并等待更有利的报价。为了减少这种情况下的损失,我们需要开发新的方法。将理论推向实际需要的步骤之一是考虑到非流动资产清算的时滞。在全球金融危机时期,这一任务对从业人员来说尤为重要。在Merton的连续时间最优消费框架下,我们考虑了一个具有非流动性资产、风险资产和无风险资产的投资组合的最优化问题。虽然标准的布莱克-斯科尔斯市场描述了投资的流动性部分,但非流动性资产在具有规定的清算时间分布的随机时刻出售。在清算的时刻,它产生了额外的流动财富,依赖于非流动资产的账面价值。投资者的对数效用函数是HARA型效用的极限情况。不同的分布的非流动性资产的清算时间正在考虑-一个经典的指数分布和威布尔分布,更实际相关。在一定条件下,我们证明了这两种情况下粘性解的存在性。应用数值方法,我们比较了经典的默顿的战略和最优消费分配策略的投资组合与不同的变现时间分布的非流动性资产。

英文摘要:

Management of the portfolios containing low liquidity assets is a tedious problem. The buyer proposes the price that can differ greatly from the paper value estimated by the seller, the seller, on the other hand, can not liquidate his portfolio instantly and waits for a more favorable offer. To minimize losses in this case we need to develop new methods. One of the steps moving the theory towards practical needs is to take into account the time lag of the liquidation of an illiquid asset. This task became especially significant for the practitioners in the time of the global financial crises. Working in the Merton's optimal consumption framework with continuous time we consider an optimization problem for a portfolio with an illiquid, a risky and a risk-free asset. While a standard Black-Scholes market describes the liquid part of the investment the illiquid asset is sold at a random moment with prescribed liquidation time distribution. In the moment of liquidation it generates additional liquid wealth dependent on illiquid assets paper value. The investor has the logarithmic utility function as a limit case of a HARA-type utility. Different distributions of the liquidation time of the illiquid asset are under consideration - a classical exponential distribution and Weibull distribution that is more practically relevant. Under certain conditions we show the existence of the viscosity solution in both cases. Applying numerical methods we compare classical Merton's strategies and the optimal consumption-allocation strategies for portfolios with different liquidation-time distributions of an illiquid asset.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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