Suddenly it's the thing everyone is talking about. Income inequality. In North Africa and the Middle East, jobless youth sparked the Arab Spring. In the United States, the growing gap between rich and poor is the “meta concern” of the Occupy Wall Street movement. Worldwide, frustrations appear to be on the rise. And, in sub-Saharan Africa, sustained economic growth may have produced tremendous advances, but a large proportion of the population is still living in poverty. Here, the underlying situation is a little more complex. In July, I wrote about the importance of inclusive growth and whether economic growth was a necessary or a sufficient condition for poverty reduction. Our latest Regional Economic Outlook for Sub-Saharan Africa takes that thinking a step further, with new analysis that looks at how living standards for the poorest households have actually been changing in some countries in the region.