If a job doesn't add more value than minimum wage, there are only a few possibilities. One is that the work gets done by an illegal immigrant. If that's not an option, the work is offshored. Finally, if the first two options aren't possible, the work simply doesn't get done.
Or, the wage is out balanced across the departments.
I used to work in welding shops, so lets take a welding shop as an example.
Mechanical Engineers - were at the top of the chain, they got paid the most to design the parts.
Supervisor - next highest paid
Forearm - next highest
Fitter and welder - next
Helper/Laborer - last
The helper barely added enough to the job to justify the wage. On the other hand, the engineer was not paid as high as engineers working in chemical plants or overseas.
The welder and fitter did not make as much as people working in the refineries, but we did not have the dangers of explosions either.
In the overall grand scheme of things, the team has to balance out. You take from one department to make sure another department can do its job. Without the last department the part could not get finished. We can not outsource moving a 30 ton part to china to preform a trivial job description. The owner of the company had to decrease the wages across the board to make sure we had laborers. That way everyone gets a paycheck, and the parts get built.