A storied pizza chain with sinking sales. The reluctant in-house acknowledgment that a lousy product was to blame.

As the S&P 500 continues its perilous ascent up the sheer rock face of worry that is today’s stock market, it’s hard not to marvel at the dizzying heights it’s been able to achieve.

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Why Warren Buffett, David Tepper And Other Top Billionaire Investors Are Piling Into Floundering UnitedHealth Stock