I disagree with the underlying presumption. We've been using animal labour since at least the domestication of wolves, and mechanical work since at least the ancient Greeks invented water mills. Even with regard to humans and incentives, slave labour (regardless of the name they want to give it) is still part of official US prison policy.

Economics is a way to allocate resources towards production, it isn't limited to just human labour as a resource to be allocated.

And it's capitalism specifically which is trying to equate(/combine?) the economy with incentives, not economics as a whole.

> Now if AGI make people's work redundant, and makes economy grow 100-10000x times... what does that measure mean at all?

From the point of view of a serf in 1700, the industrial revolution(s) did this.

Most of the population worked on farms back then, now it's something close to 1% of the population, and we've gone from a constant threat of famine and starvation, to such things almost never affecting developed nations, so x100 productivity output per worker is a decent approximation even in terms of just what the world of that era knew.

Same deal, at least if this goes well. What's your idea of supreme luxury? Super yacht? Mansion? Both at the same time, each with their own swimming pool and staff of cleaners and cooks, plus a helicopter to get between them? With a fully automated economy, all 8 billion of us can have that — plus other things beyond that, things as far beyond our current expectations as Google Translate's augmented reality mode is from the expectations of a completely illiterate literal peasant in 1700.

> Can produce lots of stuff not needed or affordable by anybody?

Note that while society does now have an obesity problem, we're not literally drowning in 100 times as much food as we can eat; instead, we became satisfied and the economy shifted, so that a large fraction of the population gained luxuries and time undreamed of to even the richest kings and emperors of 1700.

So "no" to "not needed".

I'm not sure what you mean by "or affordable" in this case? Who/what is setting the price of whatever it is you're imagining in this case, and why would they task an AI to make something at a price that nobody can pay?

> So we just hand out welfare tickets to take care of the consumption of the ferocious production, a kind of paperclip-maximizer is doing? I suggest reading the novel Autofac, it might turn out prophetic.

Could end up like that. Plenty of possible failure modes with AI. That's part of the whole AI alignment and AI safety topics.

But mainly, UBI is the other side of the equation: to take care of human needs in the world where we add zero economic value because AI is just better at everything.