Anyone familiar with basic statistics is familiar with the concept of a bell curve. A bell curve is a visual representation of normal data distribution, in which the median represents the highest ...

Not so, says Charles Murray, author of a provocative new book called Real Education. You may also know him as the much-loathed co-author of The Bell Curve, and stop reading right here.

The average tenure of a company on the S&P 500 has dropped from 33 years in 1965 to 20 years today. Why? Because they fail to anticipate the second half of the bell curve.