Recently Richard Lynn and Tatu Vanhanen have presented evidence that differences in national IQ account for the substantial variation in national per capita income and growth. However, their findings must be considered as highly problematic. The authors neither make use of state‐of‐the‐art methodological techniques nor can they substantiate their theoretical claims. More precisely the authors confuse IQ with human capital and fail to adequately discuss the causal sequence of their argument.

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