Business InsiderMar 10, 2018'We all better listen up': The CEO of an FX trading firm says Wall Street needs to pay attention to the breakneck growth of crypto exchangesverified_publisherBusiness Insider - Frank Chaparro• Cryptocurrency-exchanges are growing fast thanks to the booming market for digital coins.• That has David Mercer, the CEO of LMAX Exchange, a foreign exchange trading firm, warning Wall Street that crypto-exchanges might soon come after their respective businesses. Some of most powerful people on Wall …