The point of the story really was that most rich people, those who don't work for a living but live off of capital assets are in a position of economic power where their wealth accumulates. When the real economy grows a few percent per year but the wealthy gain 10-20% every year their wealth comes at the expense of everyone else.

This is the trickle up economy where the few people at the top suction all the wealth to themselves. And the rate at which they acquire it exceeds the rate at which they spend it.