Hedge fund bosses were 'heroes', says Michael Lewis

More than two years after the worst of the financial crisis, the analysis of what happened goes on. Much of it deals with the financial geeks who actually spotted the bust coming - the handful of hedge fund investors who realised the US subprime housing market was built on sand and about to collapse. They made serious money from betting that the market would fail.

The celebrated US author and journalist Michael Lewis has just written The Big Short, talking to those who saw the writing on the wall when no-one else did. For the BBC's Business Daily, Lesley Curwen asked him whether he thought the characters in his book caused the crisis by igniting a flame which led to the market meltdown