The economist who first warned of America's K-shaped recovery says this is his worst fear for the US

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• Peter Atwater is worried the K-shaped economy could create a caste system in the US.
• He's worried a "caste effect" could put the American dream further out of reach for many.
• Still, the economist sees the K-shaped divide between high- and low-earners fading eventually.

The economist who first warned the US about the K-shaped economy says he sees the potential for the situation to get worse.

Peter Atwater, the economist who's...