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...

This paper briefly summarizes and discusses that type of new growth models which are based on externalities created by investments in human capital. ***** TURKCE OZET: Bu makalede, yeni/içsel buyume modellerinin beseri sermayeye dayali turlerini ozetlemekte ve degerlendirmektedir. [Calisma...

I show that in a conventional Ramsey model, between one-fourth and one- half of income differences across countries can be explained by a single factor: The steady-state effect of large, persistent differences in national average IQ on worker productivity. These differences in cognitive...