The majority of the world's poor, by income poverty and multi-dimensional poverty, now live in countries officially classified by the World Bank as middle-income countries. Of course nothing happens when a country crosses a (somewhat) arbitrary threshold in per capita income but it does matter...

This paper argues that attempts at state-building in Afghanistan have led to institutions that are not robust. The state institutions and organizations continue to be highly dependent on external resources and technical expertise, and lack of critical mass of people able and willing to maintain...

Do populations grow as countries become richer? In this paper we estimate the effects on population growth of shocks to national income that are plausibly exogenous and unlikely to be driven by technological change. For a panel of over 139 countries spanning the period 1960-2007 we interact...