This three-volume set brings together the seminal contributions of the emerging new literature on alternative frameworks and methodologies for analyzing economic phenomena involving change. They focus on change as a central phenomenon, and innovative activity is at the heart of much of the work. Building on a rich intellectual heritage dating back to an earlier tradition represented by scholars such as Josef Schumpeter and Frank Knight, they seek to explain how and why firms are diverse, and how firms, industries, and regions change over time. Volume I (17 articles) discusses the product life cycle and industrial evolution, the start-up of new firms, sources and implications of diversity, the size distribution of firms, and growth. Volume II (18 articles) covers survival, learning and adaptation, productivity, and turbulence. Volume III (20 articles) addresses persistence, evolution and horizontal market structure, regional evolution, international competitiveness of industries, and public policies.The set lacks a subject index.