When Is a Bubble Not a Bubble?

The following article has been adapted from "Value: The Four Cornerstones of Corporate Finance" by McKinsey & Co.'s Tim Koller, Richard Dobbs and Bill Huyett. The publisher is John Wiley & Sons.

It's easy to construe all instances of sharply rising, then falling, stock prices as bubbles, but most of the time they're not.

True stock-price bubbles are essentially nonexistent at the level of the aggregate economy, very rare in specified industry sectors and not common for individual companies. The fact that they are so rare makes it all the more important for the value-minded executive to be able to spot them.

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