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In the wake of the financial crisis and with the rapid rise of new technologies, award-winning economist and journalist, Paul Mason, believes we're on the cusp of a seismic economic shift, of a kind yet to be seen in human history. So has capitalism had its day? Watch him argue his case with Douglas Murray, Zoe Williams, Julia Powles and Pat Kane.The Guardian Live event took place on 22 July and was chaired by Observer editor John Mulholland.