Automated Liquidity Provision and the Demise of Traditional Market Making

Details Automated Liquidity Provision and the Demise of Traditional Market Making Automated Liquidity Provision and the Demise of Traditional Market Making

2010-07-14

arxiv.org/abs/1007.2352v1

Economy

Quantitative Finance

Trading and Market Microstructure

22 pages, 4 figures

Scientific paper

Traditional market makers are losing their importance as automated systems have largely assumed the role of liquidity provision in markets. We update the model of Glosten and Milgrom (1985) to analyze this new world: we add multiple securities and introduce an automated market maker who uses the relationships between securities to price order flow. This new automated participant transacts the majority of orders, sets prices that are more efficient, and increases informed and decreases uninformed traders' transaction costs. These results can explain the recent dominance of high frequency trading in US markets and the corresponding increase in trading volume and decrease in transaction costs for US stocks.

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