"Modern crop production is based on only a few plant species. Particularly in marginal environments of developing agricultural economies, many less well-known agricultural or non-timber forest species, continue to be grown, managed or collected, thus contributing to the livelihood of the poor...

This study focuses on public investments and policy reforms for leveraging growth spillovers at the Africaregional level. It reviews first the theory and evidence of knowledge and growth spillovers generally andsecond the evidence in the African context. Given the limited and scattered evidence...