A new study has revealed that blonde women earn seven percent more on average than women with other hair colors.
The University of Queensland study, which surveyed 13,000 women, showed that blondes also marry wealthier men, who earn six percent more than the husbands of other women.
The research showed that the difference in pay remained the same even when factors such as height and education were removed.
No other hair colour had the same effect.
The study does not explain just why blondes earned more and have wealthier husbands.
However, study's lead author Dr David Johnston said: "Blonde women are often depicted as being more attractive than other women, but also less intelligent.
"But it seems the association between blondes and beauty dominates any perception that they have low intelligence.
"This could explain why the 'blondeness effect' is evident in the marriage market," he added.
The study has been published in the journal Economics Letters.