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arXiv 0907.3282q-fin.TRmath.OCmath.PR
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具有市场冲击的最优执行问题

An Optimal Execution Problem with Market Impact

Takashi Kato

摘要:

研究了连续时间市场模型中考虑市场冲击的最优执行问题。我们将该问题转化为一个随机控制问题,并研究了相应的值函数的性质。我们发现,在时间原点的右连续性与大销售的市场冲击的强度有关,否则价值函数是连续的。此外,我们还证明了相应的哈密顿-雅可比-贝尔曼方程的半群性质(Bellman原理),并将其值函数表示为粘性解.我们介绍了一些例子,其中的最优策略的形式完全改变,这取决于交易者的证券持有量和最优策略在Black-Scholes型市场与非线性市场冲击不是块清算,而是逐步清算,即使当交易者是风险中性的。

英文摘要:

We study an optimal execution problem in a continuous-time market model that considers market impact. We formulate the problem as a stochastic control problem and investigate properties of the corresponding value function. We find that right-continuity at the time origin is associated with the strength of market impact for large sales, otherwise the value function is continuous. Moreover, we show the semi-group property (Bellman principle) and characterise the value function as a viscosity solution of the corresponding Hamilton-Jacobi-Bellman equation. We introduce some examples where the forms of the optimal strategies change completely, depending on the amount of the trader's security holdings and where optimal strategies in the Black-Scholes type market with nonlinear market impact are not block liquidation but gradual liquidation, even when the trader is risk-neutral.

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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