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But $500 billion later, experts worry about the impact on the world's biggest economy, already facing a crippling housing crisis.

"The short-term economic consequences of the war have been manageable and modest. But the long-term consequences will be substantial," said Mark Zandi, chief economist of Moody's Economy.com.

Much of the problem, economists say, is that every month of combat adds more than $10 billion to a U.S. debt that now tops $9 trillion.