Development of a country is conventionally measured by GDP, but that can mask a growing inequality in that nation and makes no reference to freedoms, rights or education. The philosopher Martha Nussbaum outlines her 'human capabilities' approach which she has developed with the Nobel Prize winning economist Amartya Sen. She tells Laurie that her index can be applied around the world and across all cultures as an index which measures how populations are flourishing or flailing. Producer: Charlie Taylor.