One of every two people in Sub-Saharan Africa survives on less than $1.25 a day. That proportion has changed little over the past three decades, unlike in Asia and elsewhere, so the region's share of global poverty has risen from one-tenth to almost one-third since 1980. About 70 percent of today's 400 million poor Africans live in rural areas and depend directly or indirectly on farming for their livelihoods. While that rural share was even higher in the past, it means policies affecting the incentives for farmers to produce and sell farm products remain a major influence on the extent of Africa's poverty. The case studies help address questions such as the following: where is there still a policy bias against agricultural production? To what extent are some farmers now being protected from import competition? What are the political economic forces behind the more-successful reformers, and how do they compare with those in less-successful countries where major distortions in agricultural incentives remain? How important have domestic political forces been in bringing about reform, as compared with international forces? What explains the cross commodity pattern of distortions within the agricultural sector of each country? What policy lessons and trade implications can be drawn from these differing experiences with a view to ensuring better growth-enhancing and poverty-reducing outcomes in the study's focus countries and in the region's other economies?