Optimal Liquidation under Stochastic Liquidity

Dirk Becherer, Todor Bilarev and Peter Frentrup

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Abstract: We solve explicitly a two-dimensional singular control problem of finite fuel type for infinite time horizon. The problem stems from the optimal liquidation of an asset position in a financial market with multiplicative and transient price impact. Liquidity is stochastic in that the volume effect process, which determines the inter-temporal resilience of the market in spirit of Predoiu, Shaikhet and Shreve (2011), is taken to be stochastic, being driven by own random noise. The optimal control is obtained as the local time of a diffusion process reflected at a non-constant free boundary. To solve the HJB variational inequality and prove optimality, we need a combination of probabilistic arguments and calculus of variations methods, involving Laplace transforms of inverse local times for diffusions reflected at elastic boundaries.

Date: 2016-03, Revised 2017-11
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Citations: View citations in EconPapers (7)

Published in Finance Stoch (2018), 22/1: 39-68

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