The current research emphasis on institutions as key determinants of economic performance, rather than on resources and resource productivity, has uncovered important questions for further research. For example, if institutions are central to economic performance, then what explains observed...

Institutions either promote or constrain economic performance, but which parts of institutions advance or restrict performance, and why do economies sharing similar institutions sometimes perform differently? This paper is a modest attempt at addressing a small part of these questions. It...

I show that in a conventional Ramsey model, between one-fourth and one-half of the global income distribution can be explained by a single factor: The effect of large, persistent differences in national average IQ on the private marginal product of labor. Thus, differences in national average IQ...

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...

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...