arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.10108math.OCq-fin.MFq-fin.RM
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最优确定性等价物的随机控制

Stochastic control of optimized certainty equivalents

Julio Backhoff Veraguas, A. Max Reppen, Ludovic Tangpi

摘要:

优化确定性当量(OCEs)是一系列被从业者和学者广泛使用的风险度量。这主要是由于它的易处理性,以及它包含了重要的例子,包括熵风险度量和平均风险值。在这项工作中,我们考虑随机最优控制问题的客观标准是由OCE风险措施,或换句话说,风险最小化问题的控制扩散。由于OCE通常是时间不一致的,因此出现了一个主要困难。然而,通过状态空间的扩大,我们在公平的一般性上实现了时间一致性的各种替代。这使我们能够导出一个动态规划原理,从而恢复(风险中性)随机控制理论的中心结果。特别是,我们表明,我们的风险最小化问题的值可以通过黏性解的Hamilton-Jacobi-Bellman-Issacs方程的特点。在适当的技术条件下,我们进一步建立了后者的唯一性。

英文摘要:

Optimized certainty equivalents (OCEs) is a family of risk measures widely used by both practitioners and academics. This is mostly due to its tractability and the fact that it encompasses important examples, including entropic risk measures and average value at risk. In this work we consider stochastic optimal control problems where the objective criterion is given by an OCE risk measure, or put in other words, a risk minimization problem for controlled diffusions. A major difficulty arises since OCEs are often time inconsistent. Nevertheless, via an enlargement of state space we achieve a substitute of sorts for time consistency in fair generality. This allows us to derive a dynamic programming principle and thus recover central results of (risk-neutral) stochastic control theory. In particular, we show that the value of our risk minimization problem can be characterized via the viscosity solution of a Hamilton--Jacobi--Bellman--Issacs equation. We further establish the uniqueness of the latter under suitable technical conditions.

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