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US Federal Reserve to buy more debt to stimulate economy

13 September 2012 Last updated at 22:41 BST

The current state of the US economy has prompted a significant intervention by the Federal Reserve.

The central bank has announced a series of aggressive measures to stimulate the economy and tackle unemployment, including buying $40bn worth of mortgage debt every month until the outlook for jobs improves.

The economy is a pivotal issue in this year's US presidential election.

Mark Mardell reports.