The Bell Curve: Intelligence and Class Structure in American Life

The Most Argued-Over Social Science Book of the Century

When The Bell Curve appeared in 1994 it detonated a controversy that has not settled in thirty years. Richard Herrnstein, a Harvard psychologist who had spent his career on the experimental analysis of behavior, died of cancer weeks before publication. Charles Murray, already known for Losing Ground, was left to defend it alone. He has been doing so ever since. This Free Press paperback carries Murray's substantial afterword answering the first wave of critics.

What the Book Argues

The central claim is structural rather than sensational: that measured cognitive ability has become a more powerful predictor of life outcomes in America than parental social class, and that this represents a historical change. The authors trace how meritocratic university admissions and a knowledge economy sorted high-ability individuals out of their communities of origin and into one another's company, producing what they call a cognitive elite that is increasingly isolated from the rest of the country.

From there the book runs regression analyses on the National Longitudinal Survey of Youth, arguing that AFQT scores correlate with poverty, unemployment, illegitimacy, welfare dependency, and crime even after controlling for socioeconomic background. The closing section proposes a politics organized around what the authors call "valued places" for people across the ability distribution.

Why It Remains Contested

Two of the twenty-two chapters address group differences in test scores, and those two chapters have defined the book's reception. The statistical methods, the choice of sources, and the inferences drawn from them drew sustained criticism from psychologists, geneticists, economists, and statisticians. The American Psychological Association convened a task force in response; the resulting report, Intelligence: Knowns and Unknowns, agreed with parts of the book and rejected others, particularly on the causes of group gaps. Stephen Jay Gould, Charles Lane, and the contributors to The Bell Curve Wars mounted book-length rebuttals.

It is stocked here as a primary document. Whatever one concludes about its arguments, it shaped two decades of debate about heredity, education, and inequality, and it is repeatedly characterized by people who have not read past the summaries. Read it and argue with it directly.

Paperback. Free Press. With a new afterword by Charles Murray.