The Bell Curve: Intelligence and Class Structure in American Life

work by Herrnstein and Murray

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July 16, 2026

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The Bell Curve: Intelligence and Class Structure in American Life by Richard Herrnstein and Charles Murray argues that intelligence, measured by IQ, is a significant factor in life success. The authors suggest that differences in life outcomes between racial groups are partly due to variations in IQ, speculating that these differences may have a genetic basis.1

However, the scientific consensus is that theories of inherited IQ differences between racial groups lack a basis, with more variability found within groups than between them. Critics point out that intelligence is not clearly defined, and IQ tests can be culture-bound, reflecting educational and cultural experiences rather than innate ability. Evidence suggests that socioeconomic status and educational opportunities play a significant role in IQ test performance. While intelligence has a heritable component, it is also malleable and can be influenced by environmental factors and training.12

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race
The scientific debate over race
…this point of view was The Bell Curve: Intelligence and Class Structure in American Life (1994) by Richard Herrnstein and Charles Murray. This work is a representation of social Darwinism in that the authors argue not only that minority or low-status races have innate deficiencies but that poor people of…
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…this point of view was The Bell Curve: Intelligence and Class Structure in American Life (1994) by Richard Herrnstein and Charles Murray. This work is a representation of social Darwinism in that the authors argue not only that minority or low-status races have innate deficiencies but that poor people of…
Read More

human intelligence
Heritability and malleability of intelligence
In their book The Bell Curve (1994), Richard Herrnstein and Charles Murray argued that IQ is important for life success and that differences between racial groups in life success can be attributed in part to differences in IQ. They speculated that these differences might be genetic. Such claims,…
Read More
In their book The Bell Curve (1994), Richard Herrnstein and Charles Murray argued that IQ is important for life success and that differences between racial groups in life success can be attributed in part to differences in IQ. They speculated that these differences might be genetic. Such claims,…
Read More