Large Orders in Small Markets: On Optimal Execution with Endogenous Liquidity Supply
62 Pages Posted: 6 Feb 2019 Last revised: 31 Oct 2019
Date Written: October 30, 2019
We solve a Stackelberg game where a large uninformed seller executes optimally, fully cognizant of the response of Cournot-competitive market makers. The game therefore endogenizes both demand and supply of liquidity. The closed-form solution yields several insights. First, stealth trading is both privately and socially costly because market makers incur additional cost not knowing when execution ends. Second, the presence of a large seller does not unambiguously benefit other participants. Market makers benefit only if there is enough risk-absorption capacity or if the execution period is short. Other investors benefit only when the seller sells at high enough intensity.
Keywords: large orders, market making, liquidity supply, liquidity demand
JEL Classification: G10
Suggested Citation: Suggested Citation