I agree but those are issues orthogonal to the basic rate of unemployment, no? You can have very low unemployment and still have a very poor country if everyone's working for pennies, and that's a real problem. IIRC too low unemployment could be a sign of an unhealthy lack of economic mobility - everyone's stuck in their job and they make barely enough to scrape by, so they're terrified of dropping out of the workforce to pursue education/creative endeavors/a new career.