Some stock charts climb to seemingly impossible heights, at incredible speeds. Surely, the gains must be followed by a sharp drop -- right?

But that's not always the case.

The surging stocks might have risen for good reasons. An innovative business strategy earned a long-lived business advantage. The shifting sands of the consumer market presented a genuine opportunity with years of future upside. Or perhaps the doubters in a deep downturn were wrong all along, and it's just time for a formerly beaten-down stock to reflect its true long-term value.

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Source Fool.com