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 discusses the emergence of two new middles since the Cold War, namely middle-income countries and people living above absolute poverty but below a security-from poverty-line. The paper sets out what has happened. It is argued that although there has been substantial economic growth,...