Book excerpt: The simple but sweeping premise of this book is that a fourth, entrepreneurial economy is emerging. This will be as different from the information economy as that was from the industrial economy before it. Last century we popularized knowledge work, transforming from an industrial economy dependent on child labor to an information economy dependent on adult education. This century we will popularize entrepreneurship, changing what it means to be an employee. Since medieval times, the West has been defined by agricultural, industrial, and information economies. These three economies have transformed religion, politics, and finance. An emerging entrepreneurial economy promises to transform business. Perhaps the most interesting prediction is that social invention will be as common for the next generation as technological invention became in the last century. The Fourth Economy: Inventing Western Civilization is a wildly optimistic book that will change how you think about the past and your future.