Women in Africa are much more likely to work than those in any other region of the world, according to Mary Hallward-Driemeier, an economist at the World Bank. But they still find it difficult to make a decent living because of the kind of work they are doing. In the following interview with David Schulman of the International Monetary Fund, Ms. Hallward-Driemeier says the amount of income a woman earns depends on the kind of work she is doing. And African women are disproportionately involved in the business of self-employment.