Actually, I think there are jobs where the pay/workload do not balance, so people will tend to avoid those jobs.
If you want me to dig a ditch with a shovel in clay muck for $5.25 an hour, I'm gonna look for work elsewhere if there is another job that pays the same with a lesser workload.
Digging ditches in clay muck is extremely hard work.
There are illegal aliens willing to do it for $5.25 an hour. Don't forget they'll want government entitlements. They'll send a part of their income back to their real home (a foreign country). ETC. ETC. ETC.
So long as they'll eventually vote Democrat after they have been given amnesty. And so long as the free traitors can make a small fortune by paying them so low... then all is right with the world. According to the elites.