论文标题
将Obizhaeva-Wang类型的执行问题减少到LQ随机控制问题
Reducing Obizhaeva-Wang type trade execution problems to LQ stochastic control problems
论文作者
论文摘要
我们从一个随机控制问题开始,其中控制过程是有限变化(可能有跳跃),并在状态动力学和目标功能中充当积分器。这种类型的问题出现在Obizhaeva和Wang(具有有限弹性)的最佳贸易执行的文献流中。我们考虑一个一般框架,价格影响和弹性是随机过程。两者都可以具有扩散组件。首先,我们将问题不断地从有限变化的过程扩展到逐渐可测量的过程。然后,我们将扩展问题减少到线性二次(LQ)随机控制问题。使用有关LQ问题的良好发展的理论,我们描述了获得的LQ One的解决方案,并将其追溯到(扩展)初始贸易执行问题的解决方案。最后,我们通过几个示例来说明结果。除其他外,示例还显示了具有随机(终端和移动)目标的Obizhaeva-wang模型,将初始贸易执行问题扩展到相当大的可逐步测量过程(甚至超出半段落),以及在价格影响过程和/或弹性过程中的扩散组件的影响。
We start with a stochastic control problem where the control process is of finite variation (possibly with jumps) and acts as integrator both in the state dynamics and in the target functional. Problems of such type arise in the stream of literature on optimal trade execution pioneered by Obizhaeva and Wang (models with finite resilience). We consider a general framework where the price impact and the resilience are stochastic processes. Both are allowed to have diffusive components. First we continuously extend the problem from processes of finite variation to progressively measurable processes. Then we reduce the extended problem to a linear quadratic (LQ) stochastic control problem. Using the well developed theory on LQ problems we describe the solution to the obtained LQ one and trace it back up to the solution to the (extended) initial trade execution problem. Finally, we illustrate our results by several examples. Among other things the examples show the Obizhaeva-Wang model with random (terminal and moving) targets, the necessity to extend the initial trade execution problem to a reasonably large class of progressively measurable processes (even going beyond semimartingales) and the effects of diffusive components in the price impact process and/or in the resilience process.