Book excerpt: Modern economies never come to rest. From institutions to activities of production, trade, and consumption, everything is locked in processes of perpetual transformation – and so are our daily lives. Why and how do such transformations occur? What can economic theory tell us about these changes and where they might lead? Ulrich Witt’s book discusses why evolutionary concepts are necessary to answer such questions. While economic evolution is in many respects unique, it nonetheless needs to be seen within the broader context of natural evolution. By exploring this complex relationship, Rethinking Economic Evolution demonstrates the significance of an evolutionary economic theory.