Price goes up dramatically in the face of supply shortages, because when there's a shortage you pick your customers instead of them picking you, and some customers have a lot more money than others. Same reason software engineers make $300K/year after a few years experience (when I started my career 15 years ago $100K was considered a very good mid-career salary, and still is in some locales), and good childcare in the Bay Area now runs about $3000/month, and homes are $3M.

The government is increasingly ignoring the problem, the higher-education-industrial-complex is grabbing workers that would otherwise go into the trades, mass-importation of unskilled labor is slowing down as it becomes more of a political minefield (In the EU and the US).

The confluence of all those factors will squeeze a limited labor pool, and prices will continue to increase. I think it's not unlikely that in 5-10 years we enter a crisis where critical infrastructure starts failing and the government has to start up a "Learn to Weld" program instead of "Learn to Code" program because things have gone so far out of balance.