“…In this study, we take an encompassing approach to understand the impact of AT on an electronic limit order market by examining its effects on three dimensions, namely, (1) bid-ask spreads and market depths, (2) commonality in liquidity, and (3) market liquidity after large market declines.A growing body of literature seeks to understand the impact of AT on markets but these studies provide conflicting results. Some studies argue that AT can benefit market participants and reduce transaction costs by increasing competition among liquidity providers and eliminating information friction (e.g., Hendershott et al, 2011;Riordan and Storkenmaier, 2012).Others emphasize the detrimental effects of AT on market quality, such as the increase in mispricing due to the increase in execution risk (Frino et al, 2016). Algorithmic traders, through their ability to process information rapidly, can also exploit other traders such as those who trade for liquidity reasons (e.g., Cartea and Penalva, 2012).…”