According to some estimates, high-frequency trading by investment banks, hedge funds and other players accounts for 60% to 70% of all trades in U.S. stocks, explaining the enormous increase in trading volume over the past few years.
High frequency trading, or abitrage trading, is simply a form of arbitrage using high speed computers. We like arbitrage, for it makes markets more efficient. Flash trading is open to abuse like front-running: we don't like market abuse 
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