Differences in worker skill cause modest differences in wages within a country, but are associated with massive differences in productivity across countries (Hanushek and Kimko, 2000). I build upon Kremer’s (1993) O-ring theory of production to explain this stylized fact. I posit that there...

A recent line of research demonstrates that cognitive skills - IQ scores, math skills, and the like -have only modest influence on individual wages, but are strongly correlated with national outcomes. It this largely due to human capital spillovers? This paper argues that the answer is yes. It...

We provide evidence that individuals selected from societies with high human capital are more likely to cooperate when placed in an environment comparable to the state of nature: The world of New York City diplomatic parking. National average IQ, a robust predictor of economic growth, is found...

In the cross-country literature, cognitive skills are robust predictors of economic growth. We investigate claims by psychologists that the same is true at the state level. In a variety of specifications using four proxies for average state IQ used in the psychology literature, little evidence...

Social science research has shown that intelligence is positively correlated with patience, while growth theory predicts that more patient countries will save more. In a closed economy, that means high average IQ countries will become more capital-­intensive. In an open economy, high average IQ...

Coordination games have become a critical tool of analysis in fields such as development and institutional economics. Understanding behavior in coordination games is an important step towards understanding the differing success of teams, firms and nations. This paper investigates the...

National measures of cognitive skill, including IQ tests, have received attention recently as a possible driver of cross-country productivity differences. In a parallel literature, national measures of entrepreneurial activity and pro-entrepreneurship policies have received similar attention....

It is now well established that highly developed countries tend to score well on measures of social capital and have higher levels of generalized trust. In turn, the willingness to trust has been shown to be correlated with various social and environmental factors (e.g. institutions, culture) on...