Rural-Urban migration in Africa: TheorY, Policies and Research Implication by Derek Byerlee.

Throughout the developing world, countries are experiencing rapid rate of urbanization. In Africa, urban growth are among the highest in the world, averaging about 7 percent annually, with several cities having growth rate in excess of 10 percent.Associated with this urbanisation has been a large increase in open urban unemployment which generally aceeds 10 percent of urban labour force and consists largely of young school leavers.
Rural urban migration accounts for over half the growth of most African cities. At the same time out migration of labor from agriculture has been one factor leading to national food deficits and rising food prices in many African countries. For this reasons, there is wide spread concern that the rate of rura-urban migration should be slowed.
source:International migration review, Vol. 8.No,4.(Winter 1974) pp.546-566. published by: The centre for migration studies of new york . Available at http://www.jstor.org/stable/3002204 accessed 30/03/2010.