Fed might expand its bond-buying program, Bernanke says

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Ben Bernanke, chairman of the Federal Reserve, said the central bank might expand its $600 billion bond-buying program in order to spur economic growth in the U.S. "We're not very far from the level where the economy is not self-sustaining," Bernanke said. "It's very close to the border. It takes about 2.5% growth just to keep unemployment stable, and that's about what we're getting.

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