Why do some nations prosper while others do not? Economists usually turn to measures such as gross domestic product or per capita income to answer this question, but interdisciplinary theorist Cesar Hidalgo argues that we can learn more by measuring a country’s ability to make complex products. In Why Information Grows, Hidalgo combines the seemingly disparate fields of economic development and physics to present this new rubric for economic growth. He believes that we should investigate what makes some countries more capable than others. Complex products—from films to robots, apps to automobiles—are a physical distillation of an economy’s knowledge, a measurable embodiment of its education, infrastructure, and capability. Economic wealth accrues when applications of this knowledge turn ideas into tangible products; the more complex its products, the more economic growth a country will experience. A radical new interpretation of global economics, Why Information Grows overturns traditional assumptions about the development of economies and the origins of wealth and takes a crucial step toward making economics less the dismal science and more the insightful one.