There's a reason it's called capital-ism and not freemarket-ism.

In a true free market the exploited would be paid what their labor is actually worth and could be easily be able to retire in 5-10 years max.
It doesn't make sense that a construction worker can build 200 homes worth 500k each over a decade, but he can't afford to own even a much cheaper one.
Or when he buys one, he has to get a mortgage to spend the next 30 years paying it.
Jobs like these are the ones that produce the most real wealth of all society and they logically should be the ones that paid the most.
There are historical precedents of this happening. Sweden used to be an extremely laissez-faire economy (and still partially is), and industrial workers used to earn more than literal doctors and lawyers.

The current monetary system requires that the more critical and necessary workers be paid the least, to force them to keep working, while people with the most useless jobs (white collars) are paid the most to drive consumption and increase the GDP.
Without the exploited class being kept in near poverty to force them to produce goods and services, the fiat currency would be worthless.