“…Examining the NYSE and NASDAQ markets, Hendershott et al (2011a,b) and Hasbrouck and Saar (2013) report that bid-ask spreads and volatility improved during times of increased HFT, while Jarnecic and Snape (2014) document that on the London Stock Exchange (LSE) HFT is associated with shorter order duration and thinner depths that increase the transience of prices. Carrion (2013) and Brogaard et al (2014a) extend these studies by investigating the relation between HFT and information efficiency/price discovery and document that HFT is associated with improved impounding of information into markets. However, Jain and McInish (2012) find that HFT increases tailrisk in Japan, while Boehmer et al (2014) in their global study report that HFT increases short-term volatility, leading to further negative externalities in the market, as modelled by Biais et al (2012).…”