I. This book analyzes the evolution of organizational structures in large US companies from the 1800s to 1960. It focuses on four major companies that pioneered the "multidivisional" structure in the 1920s: Du Pont, General Motors, Standard Oil, and Sears.
II. In the 1800s, railroads developed more complex administrative hierarchies of field units, departments, and central offices to manage growth. Later, other industries integrated vertically through acquisitions or consolidation, but lacked strong administrative structures.
III. By the 1920s, centralized functional departments had become standard, but lacked flexibility. The four pioneering companies responded to new strategies of diversification and global expansion by decentralizing into product/regional divisions