This book examines how agricultural innovation arises in four African countries--Ghana, Kenya, Tanzania, and Uganda-- through the lens of agribusiness, public policies, and specific value chains for food staples, high value products, and livestock. Determinants of innovation are not viewed individually but within the context of a complex agricultural innovation system involving many actors and interactions. The volume is based on qualitative interviews with agribusiness representatives that were designed to shed light on their experiences on public policies that either enhances or impedes...