On certain stochastic control problems arising in optimal trade executionWe start with certain stochastic control problems where the control process 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 discuss how to extend the class of controls, first, from finite-variation processes to semimartingales and, second, beyond semimartingales. The need for such extensions arises when we introduce stochastically evolving liquidity parameters into the optimal trade execution problem.
The exposition covers some ideas from [1] and proceeds with [2].
This is a joint work with Julia Ackermann and Thomas Kruse.
References:
[1] Julia Ackermann, Thomas Kruse and Mikhail Urusov. Càdlàg semimartingale strategies for optimal trade execution in stochastic order book models. Finance and Stochastcis 25, 757-810, 2021. arXiv:
https://arxiv.org/abs/2006.05863[2] Julia Ackermann, Thomas Kruse and Mikhail Urusov. Reducing Obizhaeva-Wang type trade execution problems to LQ stochastic control problems. Accepted in Finance and Stochastics, 2023. arXiv:
https://arxiv.org/abs/2206.03772