Human capital plays an important role in the theory of economic growth, but it has been difficult to measure this abstract concept. We survey the psychological literature on cross-cultural IQ tests, and conclude that modern intelligence tests are well-suited for measuring an important form of a nation’s human capital. Using a new database compiled by Lynn and Vanhanen (2002), we show that national average IQ has a robust positive relationship with economic growth. Using a methodology derived from Sala-i-Martin (1997a), we show that in growth regressions that include only robust control variables, IQ is statistically significant in 99.7% of these 1330 regressions. A strong relationship persists even when OECD countries are excluded from the sample. Conditional on GDP per capita in 1960 and other control variables, a 1 point increase in a nation’s average IQ is associated with a persistent 0.13% annual increase in GDP per capita
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