Are the wealthy addicted to money, competition, or just feeling important? Yes.

"Billionaires should not exist," Senator Bernie Sanders said last month. And, at the Democratic presidential debate this week, he said that the wealth disparity in America is "a moral and economic outrage."

"Senator Sanders is right," said Tom Steyer, a businessman from California who happened to be the only billionaire onstage that night (as far as we know).

"No one on this stage wants to protect billionaires — not even the billionaire wants to protect billionaires," noted Senator Amy Klobuchar.

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It's an idea that's going around. Mark Zuckerberg,

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No one has a retirement number these days

Without constant work, we must face the nature of existence

Rich people know too many rich people

Money is like alcohol but for money

The rich suspect the roller coaster is about to crash

And the rich become anxious and isolated