More proof, for those who need it but will likely reject it, that labor is subject to the same principles of price-driven supply and demand as any other commodity.
Denmark has a two-tier minimum wage. There is one wage for those under the age of 18, and a higher wage for those over that age.
At age 18, the minimum wage increases by 40%. As workers approach and pass their 18th birthday, the employment rate drops by a third.
http://marginalrevolution.com/marginalrevolution/2017/06/minimum-wage-evidence-danish-discontinuity.html