If the U.S. government closes for three to four weeks, economic growth in the fourth quarter would decrease by as much as 1.4 percentage points, Moody's Analytics Chief Economist Mark Zandi says. A shutdown longer than two months would "likely precipitate another recession," he said. Macroeconomic Advisers predicts a two-week closure would reduce Q4 gross domestic product by 0.3 percentage point.

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