Our data source is the 1979 cohort of the National Longitudinal Survey of Youth (NLSY79). [. . .] We limit our sample to Caucasian women aged 25 and over. [. . .] Regression results indicate that blonde women receive a wage premium equivalent in size to the return for an extra year of schooling. A significant blondeness effect is also evident in the marriage market. Blonde women are no more or less likely to be married; but, their spouse's wages are around 6% higher than the wages of other spouse's.
Blonde women earn more, have husbands who earn more
David W. Johnston. Physical Appearance and Wages: Do Blondes Have More Fun? (Economic Letters 108, s. 10-12):