Kindle. I like the book. It's an economics book to me and I enjoy reading about the framework of technological revolutions. The author's definition of technology does not limit to computer technology. The author means changes in the way people live, function, and work that is so significant and widespread that it is worth calling a technological revolution. In this book, she details 5 distinct enough technological revolutions spanning over 200 years. Industrial Revolution, Age of Steam and Railways, Age of Steel, Electricity and Heavy Engineering, Age of Oil, the Automobile and Mass Production, and Age of Information and Telecommunications. Her research shows that each of these periods last between 40 and 60 years. While the author believes it is helpful to classify and categorize these periods to help explain history, she makes clear that these categorizations in no way mean putting a straightjacket on history or the future. It is meant as a fluid process of history and how to make sense of what happened. Within each period, there are 4 distinct stages that define that period. They are Irruption, Frenzy, Synergy and Maturity. She explains in detail what each of these stages mean and how they interact with each other as well as how they interact with financial capital. Overall, to me, this is an advanced book on how to look at history on technological revolutions and it does have implications for people who want to be an entrepreneur. Perhaps if history repeats itself and the Age of Information and Telecommunications started in 1971, this is 2023 and it has been 52 years since the Age started, this could mean the Maturity phase of this Age and the beginning of a new revolution.