April 2000 - If urban overconcentration really is an issue, it ought to affect economic growth rates in a robust, consistent fashion. And it does. Not only is there an optimal degree of urban concentration that varies with country income, but departures from optimal concentration result in...

The paper examines whether there is a significant relationship between economic growth and the degree of urban concentration, as measured by primacy, or the share of the largest metro area in national urban population. Is there reason to believe many countries have excessive primacy and how...

GDP growth is often measured poorly for countries and rarely measured at all for cities or subnational regions. We propose a readily available proxy: satellite data on lights at night. We develop a statistical framework that uses lights growth to augment existing income growth measures, under...