Taxes are like a sink for money. In order to have a stable money supply, the government has to take out rather than just issuing new currency to pay bills. However some people are allowed to cheat this system, and they end up with an ever increasing share of the supply.
So quite literally the difference between the wealthy and people who work for a living is that the government doesn't take nearly as much percentage-wise from the wealthy allowing them to both spend and gain in wealth.
It's not a true sink because it isn't destroyed. The government sends it back out.
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