Home buyers are moving quickly to take advantage of a tax credit that will expire at the end of April. But the increased volume has not helped prices recover, and many are worried what will happen to the housing market when the tax credit is no longer available to buyers. "If you have a short-run program to stimulate demand, it's always tricky to figure out how you gently remove it without going off a precipice," said James Poterba, an economist at the Massachusetts Institute of Technology.

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