The level of ethnic diversity is believed to have significant consequences for economic and political development within countries. In this article, we provide a theoretical and empirical analysis of the determinants of ethnolinguistic diversity in the world. We introduce a model of cultural and genetic drift where new groups endogenously emerge among peripheral populations in response to an insufficient supply of collective goods. In line with our model, we find that the duration of human settlements since prehistoric times has a strong positive association with current levels of ethnolinguistic diversity. Diversity is further negatively correlated with the length of modern state experience and with distance from the equator. Our results are thus consistent with both "evolutionary" and "constructivist" hypotheses of ethnolinguistic fractionalization.

Is social capital always important for economic growth? A number of recent micro studies suggest that interpersonal trust and social capital will have its greatest impact on economic performance when court institutions are relatively weak. The conventional wisdom from macro studies, however, is that social capital is unconditionally good for growth. On the basis of the micro evidence, we outline an investment game between a producer and a lender in an incomplete-contracts setting. A key insight is that social capital will have the greatest e¤ect on the total surplus from the game at lower levels of institutional strength and that the e¤ect of social capital vanishes when institutions are very strong. When we bring this prediction to an empirical cross-country growth regression, it is shown that the marginal e¤ect of social capital (in the form of interpersonal trust) decreases with institutional strength. Our results imply that a one standard deviation rise in social capital in weakly institutionalized Nigeria should increase economic growth by 1.8 percentage points, whereas the same increase in social capital only increases growth by 0.3 percentage points in strongly institutionalized Canada.

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The literature on nation-building and nationalism suggests that nation-building a¤ects economic and political performance, mitigates the problems associated with ethnic heterogeneity, but that nationalism, an indicator of successful nation-building, is linked to dismal performance via protectionism and intolerance. This paper shows that there is a nonlinear association between nationalism and government e¤ectiveness, that nationalism leaves no imprint on the e¤ects of ethnic heterogeneity but may be a positive force in former colonies, and that actual trade ‡ows are independent of the level of nationalism in the population.

We provide micro-level evidence on an important channel through which mineral resources may adversely affect development in the long-run: lower educational attainment. Combining Afrobarometer survey data with geocoded data on the discovery and shutdown dates of of gold mines, we show that respondents who had a gold mine within their district when they were in adolescence have significantly lower educational attainment. These results are robust to the omission of individual countries, different definitions of adulthood, the use of alternative data from the Development and Health Surveys (DHS), and buffer-based approaches to define neighborhood. Regarding mechanisms, we conclude that the educational costs of mines are likely due to households making myopic educational decisions when employment in gold mining is an alternative. We explore and rule out competing mechanism such as endogenous migration, a lower provision of public goods by the government, and a higher propensity for violent conflicts in gold mining districts.