As global extreme poverty has fallen-by one measure, from close to 2 billion people in 1990 to about 700 million today-the world has learned about antipoverty strategies that work. These experiences should inform the final push to end extreme poverty. In the 1960s and 1970s, when close to half...

The 2014 release of a new set of purchasing power parity conversion factors (PPPs) for 2011 has prompted a revision of the international poverty line. In order to preserve the integrity of the goalposts for international targets such as the Sustainable Development Goals and the World Bank's twin...