Abstract

We examine the market quality effects of technology upgrades juxtaposed with short sale bans. Between 2011 and 2013, the Spanish Stock Exchange launched a smart trading platform (SIBE-Smart), imposed two short sale bans, and introduced colocation to facilitate high speed trading. We find that the SIBE-Smart introduction leads to reduced market quality. Although colocation improves some dimensions of liquidity, it does not attract additional high speed trading. Our results indicate that the effects of the two technology enhancements cannot overcome the negative effects of the short sale bans and overall market quality declines significantly. These results are in contrast to existing studies that attribute enhanced market quality to increased fast trading resulting from technological inducements. We conclude that the beneficial effects of technological upgrades that attract fast trading, improving liquidity and price efficiency, are negated in the presence of regulatory restrictions.

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