I think this book is a great achievement. It is packed with useful information and thought-provoking analysis and discussion. The work on technological development is, especially, a very valuable original contribution to the work in this field. The book illuminates the technological trajectory so often ignored by economists, but which underlies Schumpeter s "clusters" of innovations, and the emphasis on trunk innovations and analysis of their role is of particular interest. Christopher Freeman, SPRU Science and Technology Policy Research, University of Sussex, UK and Maastricht University, The Netherlands This pathbreaking book addresses the economics of technological change as revealed by a unique methodology that uncovers the true nature of technological development. Masaaki Hirooka bases this new approach to the economics of technological change on the recognition of the nonlinear dynamic nature of innovation. In order to provide a richer understanding of technological development, the book focuses on the period of innovation prior to market launch, grounding the analysis within a distinct innovation paradigm. This is expressed using three logistic trajectories technology, development and diffusion which make it possible to interpret and better understand technology foresight, infrastructure formation, long business cycles and national innovation systems. The author emphasizes the importance of the timing of innovation commitment, knowledge transfer between and within these trajectories, and the evolutionary character of innovation. Those with an interest in economics, macroeconomics, technological change and evolutionary economics will find this book to be a highly stimulating and fascinating read.