At least one-fourth of the U.S. economy has suddenly gone idle amid the coronavirus pandemic, an unprecedented shutdown of commerce that has darkened stores from Manhattan to Gilpin County, Colo., an analysis conducted for The Wall Street Journal shows.

The study, by the economic-analysis firm Moody’s Analytics, offers one of the most comprehensive looks yet at how much of the world’s largest economy has shut down in the past three weeks, and which states and regions are being slammed the hardest. While the full extent of…

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