Natural resources can make diversification and structural change more challenging. This chapter focuses on why public policy matters. International competitiveness depends on both relative prices and on the policy and institutional changes and investments that governments make to enhance it. Drawing on the five country case studies in this volume, the authors suggest lessons for the design of policies to promote structural change in Africa’s resource exporters. They address the three key themes—managing the boom, the construction sector, and linking industry to the resource—then propose ideas for widening options for structural change. These include reforms to deal with ‘Dutch disease’, expanding the concept of structural change from a focus on industrialization to ‘industries without smokestacks’, and investing in knowledge.