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Algorithmic Trading and Market Quality: International Evidence

Published online by Cambridge University Press:  13 October 2020

Ekkehart Boehmer*
Affiliation:
Singapore Management University Lee Kong Chian School of Business
Kingsley Fong
Affiliation:
University of New South Wales Business School k.fong@unsw.edu.au
Juan (Julie) Wu
Affiliation:
University of Nebraska–Lincoln College of Business juliewu@unl.edu
*
eboehmer@smu.edu.sg (corresponding author)

Abstract

We study the effect of algorithmic trading (AT) on market quality between 2001 and 2011 in 42 equity markets around the world. We use an exchange colocation service that increases AT as an exogenous instrument to draw causal inferences about AT on market quality. On average, AT improves liquidity and informational efficiency but increases short-term volatility. Importantly, AT also lowers execution shortfalls for buy-side institutional investors. Our results are surprisingly consistent across markets and thus across a wide range of AT environments. We further document that the beneficial effect of AT is stronger in large stocks than in small stocks.

Information

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Michael G. Foster School of Business, University of Washington

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