Elon Musk:

My prediction is that there will effectively be universal high income. In fact, it's not clear to me that money will even matter in the future.

Like if you increase the economy, the output of goods and services to a much greater level than can be consumed by the number of people on the planet, then you have an age of plenty.

It's hard for us to wrap our minds around the fact that our entire evolutionary history has been an evolution of constraints, of a place where we didn't have enough food or we didn't have enough heat.