At the same time, rich Americans are able to save more. They have the ability to invest this money. Any money made on these investments benefits the investor, not the economy in general.
The income gap isn't likely to shrink soon. According to the Gini Index, which measures global income gaps, the separation between the rich and poor in America is among the worst in the world. Without dramatic changes to fiscal policy, which is unlikely given the deadlock in Washington, this will be tough to reverse.
"There has been class warfare going on," said Warren Buffett, famed investor and chairman of Berkshire Hathaway, in a September 30 interview on PBS. "It's just that my class is winning. And my class isn't just winning, I mean we're killing them."