Over the past decade six of the world's ten fastest-growing countries were African. In eight of the past ten years, Africa has grown faster than East Asia, including Japan. Even allowing for the knock-on effect of the northern hemisphere's slowdown, the IMF expects Africa to grow by 6% this year and nearly 6% in 2012, about the same as Asia.

The commodities boom is partly responsible. In 2000-08 around a quarter of Africa's growth came from higher revenues from natural resources. Favourable demography is another cause. With fertility rates crashing in Asia and Latin America, half of the increase in population over the next 40 years will be in Africa. But the growth also has a lot to do with the manufacturing and service economies that African countries are beginning to develop. The big question is whether Africa can keep that up if demand for commodities drops.

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