The U.S. recession may not be coming to an end and there is a risk the economy may experience a "double-dip" contraction, said Martin Feldstein, a professor of economics at Harvard University.

"There is a real danger this is going to be a double dip and that after six months or so we'll have some more bad news," Feldstein, the former head of the National Bureau of Economic Research and Reagan administration adviser, said today in an interview on Bloomberg Television. "We could slide down again in the fourth quarter."

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