To explain cross-country income differences, research has recently focused on the so-called deep determinants of economic development, notably institutions and geography. This article shows that it is not only absolute geography, in terms of for instance climate or being landlocked, but also...

We study the distribution of economic activity, as proxied by lights at night, across 250,000 grid cells of average area 560 square kilometers. We first document that nearly half of the variation can be explained by a parsimonious set of physical geography attributes. A full set of country...