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The Labour Participation Rate in the US is 62.9%, compared with 78.8% in the UK, where unemployment rate is 4.2%.

That means that in the US, in addition to the 4.1% who are unemployed, there are another 37.1% who don't have a job, but aren't classified as unemployed for one reason or another, compared with "only" 21.2% in the UK.