Jack Lew: We are not facing a market crisis like 2008

As United States Treasury Secretary, Jacob or "Jack" Lew is in charge of steering the world's biggest economy.

In the wake of the stock market turmoil, he has been playing down fears that we could be facing a new financial crisis.

At the World Economic Forum in Davos, the BBC's Economics Editor Kamal Ahmed asked him how optimistic he is about the global economy this year.

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