Liquidity Provision by Automated Market Makers

29 Pages Posted: 15 Oct 2020 Last revised: 17 Nov 2020

See all articles by Jun Aoyagi

Jun Aoyagi

University of California, Berkeley - Department of Economics

Date Written: May 14, 2020

Abstract

A growing number of blockchain-based decentralized exchanges have adopted automated market makers to attract liquidity, and they replace the traditional order book system for trade execution. This paper studies the equilibrium liquidity provision via constant product market makers, one of the simplest and widely adopted algorithms of automated market making. The model derives the optimal behavior of liquidity providers and the aggregate size of the liquidity pool on a constant product market. As suggested by the traditional market microstructure literature, I demonstrate that information asymmetry between traders leads to an adverse selection problem and plays a key role in determining equilibrium liquidity on an automated market. Moreover, when liquidity providers are strategic, I find that competition between them exhibits both strategic substitution and complementarity, making the best response function of each liquidity provider non-monotonic in her rivals' liquidity supply. The model also shows that the equilibrium market liquidity tends to be stable and does not diverge or evaporate even if a (small) temporary shock hits the market.

Keywords: automated market makers, constant product market makers, decentralized exchanges, Uniswap, blockchain, strategic liquidity provision

Suggested Citation

Aoyagi, Jun, Liquidity Provision by Automated Market Makers (May 14, 2020). Available at SSRN: https://ssrn.com/abstract=3674178 or http://dx.doi.org/10.2139/ssrn.3674178

Jun Aoyagi (Contact Author)

University of California, Berkeley - Department of Economics ( email )

CA
United States

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