How did mass production change the roles in the workplace?
The work once done by apprentices was now done only by skilled craftsmen.
The work once done by skilled workers was now done by machines and unskilled workers.
Skilled workers who could use machines were now in more demand than unskilled workers.
Skilled workers now took on more unskilled workers as apprentices to learn their trades
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I'd probably go with the second option - the work done by skilled workers was now done by machines and skilled workers.
There was still a need for skilled trades in specialty positions, but because mass production broke down the processes of building something, it technically meant anyone with some skill could do the work without knowing too much about the rest of the system. Many, "low skilled" workers could find jobs in factories, pushing back on the need for skilled workers to fill in the gaps -- or train expensive replacements.
*unskilled workers, not skilled workers (for the answer, my bad)