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Manpower will always cost less that a robot, no matter in what time, we are easily to replace and even use. Quality of work do no matter, quantity can be but still you need people to buy your shit, no manpower no economy.
This is already not true. Automation has massively reduced the labor required in many industries.
Think about how many millions of labor-hours this thing performs during its lifetime: https://en.wikipedia.org/wiki/Bagger_288
*note the tractor for scale in the bottom left
Universal Robots offers robot arms for a couple of thousand bucks. Much cheaper than human labor.