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HEY PRESTO: as if by magic, Nigeria has declared itself the biggest economy in Africa. Overnight, with the wave of a statistical wand, it has added 89% to its GDP, now worth $510 billion, and soared past the previous leader, South Africa, worth $370 billion. Nothing has changed in Nigeriaâs real economy, except the way it is measured. Yet the magic matters. The GDP revision is not mere trickery.
LAST month Kai Krause, a computer-graphics guru, caused a stir with a map entitled The True Size of Africa , which showed the outlines of other countries crammed into the outline of the African continent.ive years ago sub-Saharan Africa's economy was no bigger than that of the city of Chicago. (Imagine Chicago with 46 different ministers of education, transportation, finance etc., and 46 customs border inspection systems.