Elon Musk:

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

Like if you scale the economy, the output of goods and services to a level much greater than could possibly be consumed by the number of humans on the planet, then you have an age of abundance.

That is difficult for us to wrap our minds around because our entire evolutionary history has been an evolution of constraints, of where we didn’t have enough food or we didn’t have enough heat.