Earlier quoted context omitted.
"As for the real world you can observe demand satiation right now among different ranks of the rich. Look at billionaires. They consume much more than the man who has only a few million in the bank, but sub-linearly more." Which is why the growing wealth inequalities are bad for the overall economy. The rich can't spend their money with enough scale or velocity.
But the money of the rich is in circulation in the form of investments. Why is retail spending better for the economy? I'm genuinely interested.
This is fine so long as investments move. We have such a high degree of aggregation of capital now that it sort of doesn't. It's sort of ... pinned down in the light cast by the public markets.
Even mutual finds are just now coming of age, much less the things that were innovations on them.