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eal income per head in much of sub-Saharan Africa grew rapidly in the 1960s, but faltered following the first OPEC oil price shock in 1973-74, and then stagnated or fell from the late 1970s to the early 1990s. Africa also saw a broad wave of authoritarian rule sweep the continent in the 1960s and early 1970s. Since 1990, however, the African political landscape has experienced significant changes, many in the direction of greater pluralism and democracy. Moreover, where civil strife has been avoided, Africa has seen a broad tendency towards rapid growth for several years after 1995.
Ndulu et al. (Sun,) studied this question.