Automated dealing could âtrigger a number of risks for orderly trading and financial stabilityâ, the European Central Bank has warned, in an unusual intervention in the debate over the role of âhigh-frequencyâ trading in markets. The comments come as the growth of high-frequency trading shows no sign of abating with exchanges continuing to upgrade trading systems to accommodate such traders. ... The bank also said the high number of orders generated by HFT âmay put market infrastructures under severe stressâ. While such traders were often mentioned as providers of liquidity in the markets, the ECB said âunexpected stress situations may lead them to a sudden withdrawal with lasting liquidity disruptionâ. http://www.ft.com/cms/s/0/e23ddc24-4044-11e0-9140-00144feabdc0.html#axzz1EhvtFspg