What a year it has been for the shares of (NYSE: C)! The past 52 weeks have been good for the S 500 index (SNPINDEX: ^GSPC), which is up 16% over that span. But it has been amazing for Citigroup's stock, which is up roughly 50%, more than three times the gain of the S 500.

Don't rush out to follow the crowd on this one. Take a moment to consider Benjamin Graham's view that paying too much for a great business can turn it into a bad investment.

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Source Fool.com