This book is the first work to systematically study the development of large-size economies. From a completely new perspective, it defines and selects a set of representative large-size economies. It first analyzes the basic characteristics of large-size economies and the mechanisms behind economic growth, and then explores how a country’s scale shapes industrialization, urbanization, institutional change, and governance structures, describing a path for a major economy to an economic powerhouse. The book is selected for China’s National Achievements Library of Philosophy and Social Sciences and has made notable contributions to the development of China’s economic discourse system.