Comment by palmotea

It's pretty obvious: once automation and wealth concentration get so extreme, the economy will get weird and stop being "capitalist" as we understand it.

For instance: it'd expect money to become near-meaningless, and the economic activity of the trillionaire class will consist mostly of direct extraction and consumption of resources (basically a personal autarky). There may be some barter of things like energy, raw materials, and maybe a small amount of proprietary items.

Given the lack of need to pay labor and the direct control of more resources than they'll ever need, the trillionaire will direct the world enonomy to towards pet projects (e.g. an Elon Musk commanding his robot army to build a giant steel pyramid on the moon in his honor, because why not? It'll be cool!).