besides spend it on frivolous shit like yachts and planes and stuff, there's no way it's all liquid. do they just park all their billions in a bunch of investment vehicles and wait for it to propagate itself? don't they get bored of just waiting and watching line go up?
On savings and gov bonds, sure. But if they have a fraction of their wealth sitting in stocks, it is more than enough.
Investment returns != Interest
I mean, in the sense that rectangle != square, sure. But at the end of the day, money is gaining value each period regardless. Shame on me for using the two interchangably.