According to Jevon's paradox[0], this would lead to more consumption of resources. We're already straining at the limits of the Earth. Depletion and collapse won't be good for anyone.
> provide higher quality advice to everyone at an absurdly low cost
Given every LLM's propensity to hallucinate, the only quality advice is that which can be followed back to a human expert-vetted source. But we already have people who don't check sources and get bad advice.
> revolutionise research
Maybe, but AI is also being used in a mass spread of misinformation.
> a step-change improvement in the quality of economic management
I don't know exactly what you mean by this, but from what I'm seeing so far, this looks like it will massively increase wealth disparity, which is bad for most people.