This chapter reviews the ideas that have been developed to describe the emergence and change of structures in three fields: Economics, Management, and Design of Technologies. The chapter focuses on one empirical setting, the economy, and more specifically how firms, industries, and technologies change over time. Today’s industrialized economies are very different from the economies before the industrial revolution. The chapter presents key theoretical ideas from evolutionary economics, management, and technology that try to explain why and how economy has been so dramatically transformed over the past 400 years. You can download a draft of chapter here or find the book in your library or buy it at Amazon.com or MIT Press.