So let's say 20 people, each of them starts with 20 dollars, and over time, each of them gets 5 dollars per second, and as they get their money, they randomly give 4 dollars to each other, so what's going to happen to their money? What if, as the rich (the people with the most money) increase their share of total wealth, the amount of money they receive per turn from the system also increases as their share of total wealth?
I call this the predatory effect.