Most of the time, when you have a strong man, that indicates independence and a strong will. Strong willed people tend to stick to themselves and take care of themselves BY THEMSELVES. That's one translation lol
The answer is... In hazardous situations, the instinct to survive overcomes everything else.
Low- costing workers many make sense, but I will give a suggestion.
You could use :- Low- waged workers, that is because they are given low wages.