Optimal execution in a fractional setting with reinforcement learning
Matthieu Garcin, Jiang Pu, Thomas Verrier
Abstract
We consider the problem of optimal liquidation with linear market impact, as in the seminal work of Almgren and Chriss, but with an asset driven by a fractional Brownian motion. For $H \neq 1/2$, we observe that the deterministic solution given by Almgren and Chriss is no longer optimal. We develop a strategy to exploit the information induced by the correlation between price increments. The strategy is derived from a policy gradient algorithm, parameterized by a neural network, trained to maximise the CARA utility, for which our method allows for significant improvements.
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