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The US economy 'all but stagnated' in the first three months of the year. It grew at an annual rate of just 0.2%. We find out more from Benjamin Friedman, an economist at Harvard University. Technology journalist Rupert Goodwins explains how one tweet may have cost Twitter's shareholders almost $8bn. And, Â鶹Éç business correspondent Theo Leggett tells the story of the British trader accused of helping to trigger Wall Street's 'Flash Crash' in 2010.