As researchers with a focus on government and private-sector actions that benefit the bottom of the pyramid, LIRNEasia has an interest in understanding poverty and who is poor. This summary report by the Economist gives a good overview of World Bank and ADB research on the subject. Of course, those interested are recommended to go to the sources for the real thing.
BTW, for those who wonder why we keep saying that South Asia is the home to the world’s largest concentration of poor people, the answer is that the World Bank states that 595.5 million people live on below USD 1.25 (purchasing parity) in South Asia. Sub-Saharan Africa only has 384.2 million.