Answer:
I think it is profit
Explanation:
Workers were often working in gross, crammed conditions. They made little pay, but it was for the benefit of the workforce.
The owners were delighted with such a high increase in the working population. This increased their margins, which is why I suggest profit. Other than that, I do not know about quality control. I would assume they wanted good products, but the best answer (in my opinion) is profit.
