Income Inequality and IQ
The importance of intelligence quotient (IQ) to income is analyzed using data from the National Longitudinal Survey of Youth, a study that began in 1979 with 12,686 subjects. Data for this study go through the 1994 interview wave, so that the most recent income data is for 1993. Statistical techniques are used to separate the influence of IQ from the influences of family background. The comparison of siblings who grew up in the same home, but who have different IQs shows that brighter siblings have more education and higher level occupations and are employed more of the time. The data are also used to explore the question of whether the elimination of poverty and ensuring that all children are born into intact families would decrease income inequality in succeeding generations. The analysis suggests that those of below-average intelligence would still earn less than their peers with higher IQs. It is concluded that policy analysts must stop avoiding the reality of human inequality. (Contains 17 tables and 17 endnotes.) (SLD)
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PARENTAL SOCIOECONOMIC STATUS AND
HOW MUCH DIFFERENCE DOES IT MAKE WHETHER
American Enterprise Institute analysis Bell Curve Bell Curve's Bright 90th Bright siblings 75th–89th Bright siblings 90th centile Chairman and CEO Charles Murray Class sample sample Cognitive Class sample Cognitive Elite comparison sibling complete a B.A. differences in mean Dull less Dull siblings 10th–24th Dull siblings less economic effect of IQ family background full NLSY sample Full Utopian NLSY Herrnstein high-IQ Illegitimacy income inequality income redistribution independent variables intact families Korenman labor force less than 10th logit median earned income NLSY Cognitive Class Normal reference group number of children outcomes parental income parental SES index percent Policy Studies population at large poverty poverty line reference group 25th–74th Reference Siblings regression Resident Fellow Resident Scholar sample sample sample sample Very Bright Shared Envi sibling analyses SIBLING DIFFERENCES sibling pairs sibling sample SOURCE total family income twenty-eight through thirty-six Utopian NLSY Cognitive utopian sample Winship