Its certainly possible technically (and legally in some cases). Italy has a 0.02% tax on transactions lasting less than half a second: http://www.dw.de/italy-fi

Its certainly possible technically (and legally in some cases). Italy has a 0.02% tax on transactions lasting less than half a second: http://www.dw.de/italy-first-to-slap-tax-on-high-speed-stock-trading/a-17060424 http://www.dw.de/italy-first-to-slap-tax-on-high-speed-stock...