Less than a dollar a day

Published: March 2, 2012, 11:50 p.m.

Tim Harford assesses how global poverty is measured, as the World Bank releases the latest figures on the number of people living on less than a dollar a day. What progress has been made, and how useful a benchmark is this \u201cdollar a day\u201d global poverty line? This programme was originally broadcast on the BBC World Service.