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Available for over a year

Just when it seemed the world's biggest economy was getting back on its feet a new set of GDP figures come in suggesting growth in America has slowed. The hope had been that America could provide inspiration - and some desperately needed demand - for the rest of the developed world. Or could it be the figures themselves that are at fault? Can't statistics be used to prove almost anything? Justin Rowlatt and his guests, Professor Nancy Koehn of Harvard Business School, Paul Dales, senior US economist at Capital Economics and Timothy Noah, author of "The Great Divergence, discuss the truth behind the numbers.