An FBSDE Approach to Market Impact Games with Stochastic Parameters


Authors
Samuel Drapeau, Peng Luo, Alexander Schied and Dewen Xiong
Date
2021
Journal
Probability, Uncertainty and Quantitative Risk, 6(3):237-260
Abstract
We analyze a market impact game between n risk averse agents who compete for liquidity in a market impact model with permanent price impact and additional slippage. Most market parameters, including volatility and drift, are allowed to vary stochastically. Our first main result characterizes the Nash equilibrium in terms of a fully coupled system of forward-backward stochastic differential equations (FBSDEs). Our second main result provides conditions under which this system of FBSDEs has indeed a unique solution, which in turn yields the unique Nash equilibrium. We furthermore obtain closed-form solutions in special situations and analyze them numerically.
Keywords
FBSDE, Market Impact, Nash Equilibrium
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