Machines can make widgets much faster than people. But machines don't ever buy any widgets. If people don't buy widgets there's no reason for machines to make them. Thus the widget industry collapses because no one can afford widgets anymore.
The capitalists answer is to make widgets even cheaper yet...
This business of replacing people with machines has been going on since the industrial revolution started. Did you know that in South Africa they call traffic lights "robots". Citation
I'll have to ask some SA buddies, never heard that before.
But then again, I didn't know Die Antwoord hated Lady Gaga so much either.
Maybe I don't know nuthin!
Eventually no one can afford widgets, and the capitalists at the top will have to figure out a way for everyone to have an income of some kind.