“Ability and Income”, 1943 (; backlinks; similar):
The distribution of intelligence as measured by recognized scales supplemented by other information conforms closely to the normal curve of error, while that of personal income presents a highly skewed J-shaped curve. This discrepancy suggests a complex relationship between intelligence, personal output, and economic success.
Reconciliation of this apparent discrepancy can be made by regarding income as dependent mainly on output, which in turn is related to the contributing abilities by some special function. Confirmation of this theory appears in the fact that in many intellectual fields the distribution of output approaches the J-shaped curve. The intricacies of this relationship highlight the multifaceted nature of economic disparities and the factors contributing to them.
The inequality in personal income is largely, though not entirely, an indirect effect of the inequality in innate intelligence. Yet, mental output and achievement are undoubtedly influenced by differences in social and economic conditions. These findings underscore the complex interplay between innate abilities and the impacts of socioeconomic status on personal outcomes.
This is instanced by the fact that in assessing the influence of innate ability and parental income upon entrance to the universities, it appears from statistical analysis that of the ex-elementary (non-fee-paying) group about 40% of those possessing the necessary intelligence fail to obtain a university education. On the other hand, an equal number of children whose parents pay for their early instruction receive a university education for which their innate abilities alone scarcely equip them. The study sheds light on the substantial barriers to education and achievement posed by economic factors, despite inherent intellectual capabilities.
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