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But as things get automated and cheaper that’s actually negative gdp growth. So it won’t pay your retirement

If things get cheaper, you can live off less income from your investments .

Yep, and in such a world, a reasonable level of taxation would eventually be able to pay for a modest lifestyle for everyone who wanted it.

In a world of such dramatic surplus, it's either that or violent revolution, so I'm fairly sure it would sort itself out.