How inequality breeds billionaires across Africa

25 years ago, Africa had zero billionaires. Today, it has 23, and the four richest have as much wealth as 750 million Africans combined. But how is this concentration of wealth taxing Africa's poorest people? Eddy Micah Jr. talks to Kwesi Obeng reseracher at Oxfam, Africa and DW's Olisa Chukwuma in Lagos