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In 2014, journalist Michael Lewis caused a storm with his book Flash Boys which concluded markets were rigged against ordinary investors. The book lifted the lid on the world of high speed financial traders who manage to take a tiny slice of millions of transactions, without taking any risks at all. Two of the stars of the book - who helped Lewis expose how these traders operate - have now started a new stock exchange to protect investors from being picked off by the speed merchants. Our Technology Editor David Grossman reports.