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We've replaced human jobs in the past not just made them more efficient. Horses (and all the jobs to do with them) were completely displaced by cars. Those jobs aren't more efficient, they're gone. Similar with many other jobs during the industrial revolution. This is not a zero sum game. For an economy to exist we need consumers. For consumers to exist we need people to have jobs and be paid. So the equilibrium is t…
I think that's really unimaginative and not thinking about it right. If you control the basic resources and own the tools needed to convert those into whatever you want, why does the "economy" even matter? If you can get anything you want without needing anything from the other 95% of people, having "consumers" in the sense you're thinking doesn't matter any more.