Employers across industries have for months complained of a shortage of workers as the unemployment rate creeps to levels unseen in nearly half a century – all while tens of millions of working-aged Americans still lack formal employment without any apparent interest in sending out a resume.

The percentage of workers interested in holding a job who don't currently have one is as low as it's been in years. That's driven much debate among economists, employers and politicians as they attempt to figure out exactly how to better tap the pool of nearly 100 million Americans over the age of 16 who neither have a job nor are actively looking to land one.

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