US national debt: Is $32 trillion a big number?

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The level of US government debt has just surpassed 32 trillion dollars. Negotiations over raising the borrowing limit once again went down to the wire a few weeks ago. But how concerned should we all be about how much the US government borrows? We investigate with the help of Kent Smetters, professor at the Wharton School of the University of Pennsylvania and Betsey Stevenson, Professor of Economics and Public Policy at the University of Michigan. Presenter: Charlotte McDonald Producer: Jon Bithrey Editor: Richard Vadon Production Co-ordinator: Brenda Brown Sound engineer: Graham Puddifoot (Photo: View of the US National Debt Clock in midtown Manhattan, New York City. Credit: Eduardo Munoz Alvarez /Getty Images)