Artificial states are those in which political borders do not coincide with a division of nationalities desired by the people on the ground. We propose and compute for all countries in the world two new measures how artificial states are. One is based on measuring how borders split ethnic groups...

We provide new measures of ethnic, linguistic and religious fractionalization for about 190 countries. These measures are more comprehensive than those previously used in the economics literature and we compare our new variables with those previously used. We also revisit the question of the...

We present a model that links heterogeneity of preferences across ethnic groups in a city to the amount and type of public good the city supplies. We test the implications of the model with three related datasets: US cities, US metropolitan areas, and US urban counties. Results show that...

Politicians may use disguised' redistributive policies in order to circumvent opposition to explicit tax-transfer schemes. First, we present a theoretical model that formalizes this hypothesis; then we provide evidence that in US cities, politicians use public employment as such a redistributive...

This paper describes a simple model of technology adoption which combines the two engines of growth emphasized in the recent growth literature: human capital accumulation and technological progress. Our model economy does not create new technologies, it simply adopts those that have been created...

In the new millennium, the Western aid effort towards Africa has surged due to writings by well-known economists, a celebrity mass advocacy campaign, and decisions by Western leaders to make Africa a major foreign policy priority. This survey contrasts the predominant "transformational" approach...

Soviet growth over 1960-89 was the worst in the world after we control for investment and human capital; the relative performance worsens over time. The declining Soviet growth rate over 1950-87 is explained by the declining marginal product of capital; the rate of TFP growth is roughly constant...

We assemble a dataset on technology adoption in 1000 B.C., 0 A.D., and 1500 A.D. for the predecessors to today's nation states. We find that this very old history of technology adoption is surprisingly significant for today's national development outcomes. Although our strongest results are for...

Does economic development depend on geographic endowments like temperate instead of tropical location, the ecological conditions shaping diseases, or an environment good for grains or certain cash crops? Or do these endowments of tropics, germs, and crops affect economic development only through...

This paper analyzes the structural relationship between policies that distort resource allocation and long-ten growth. It first reviews briefly the Solow model in which steady-state growth depends only on exogenous technological change. Policy distortions do affect the rate of growth in the...