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I'm not sure I'm following the analogy. If robots replace humans, we will have an increase in things to buy due to increased efficiency, but a lot more people will become poorer due to a lack of empolyment. If no other factor is involved, what you'll see is at least an increase in the disequality of distribution of richness between those who have been replaced and those who owns the replacement, proportional to the level of sophistication of the said AI.
People get employed when their work allows an employer to create more value, that a customer can buy, than their wage costs.
Robots need to be designed, built, trained and repaired.
When it comes to wealth inequality that's partly true. Automatization has the potential to create a lot of inequality because skill differences lead to stronger outcome differences.