Noah Smith, Columnist

The Rich Are Different. They're Better Investors.

This is a big cause of rising inequality, and it won't be easy to fix.

The more you make, the smarter you get -- and vice verse.

Photographer: Thomas Trutschel/Photothek/Getty Images
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What if the rich get richer because they know how to invest their money more effectively? New research shows that this may be a factor behind the rise in inequality.

Different investors have different levels of sophistication. Why?