Increasingly, economists concur that innovation processes are far from equilibrium phenomena. Indeed, these processes are characterized by complex qualitative changes in the relations between producers, sellers and users, from which new products and new markets emerge. In order to understand such processes, many economists have begun to draw on ideas and methods from “the sciences of complex systems” literature. In this paper, I examine in detail three concepts from this literature, and I show how, taken together, these concepts provide a foundation for a complexity theory of innovation. I briefly characterize these concepts as follows: 1.The “more is different”principle The need to reach new potential consumers in the face of increased...