Ten years ago, the world watched as the biggest financial meltdown in history unfolded. The crash plunged the world into recession, lost millions of families their homes and its shadow still hangs over our politics today. And when the Queen went to the London School of Economics, she asked the question everyone wanted the answer to: why did no one see it coming?

Aditya Chakrabortty, senior economics commentator at the Guardian newspaper, chairs a discussion between four economists who can claim they did.