So far, the economic impact of the partial government shutdown has been felt mainly by the 800,000 federal workers who are either furloughed or working without pay. But as the shutdown drags on, its effects will ripple through the economy, and could contribute to more uncertainty on Wall Street. 

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Correction (Jan. 14, 2019): A previous version of this story misstated the number of federal workers who have been furloughed. The text has been corrected.