Gates, Buffett to biz students: We're still bullish on capitalism...Okay, billionaires

Much of the fun of observing the friendship between Warren Buffett and Bill Gates is derived from the fact that they are such unlikely comrades. In Gates, you have the 54-year-old quintessential tech geek billionaire. And in Buffett, the revered 79-year-old homespun, value-investor billionaire. What could they possibly have in common?

Oh yeah, billions. Together, the two are worth a combined $100 billion, an announcer pointed out during an event in New York Thursday organized to let future business leaders -- MBA students at Columbia University -- ask questions of the fabled capitalists.