U-6 adds all workers marginally attached to the labor force, plus total employed part time for economic reasons as a percent of the civilian labor force.

In other words, the U-6 unemployment rate counts not only people without work seeking full-time employment (the more familiar U-3 rate), but also counts “marginally attached workers and those working part-time for economic reasons.”

Federal Reserve chair Janet Yellen has repeatedly cited the U-6 unemployment rate between 2014 and 2016.

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