In two thousand five thirt ten percent of the world's population lived off less than the equivalent of a dollar a day. The poor are no less rational than any one else, quite the contrary, precisely because they have so we often find them putting much careful thought into their choices. They have to be sophisticated economists just to survive. To progress, we have to abandon the habit of reducing the poor to cartoon characters and take the time to really understand their lives in all their complexity and richness.