The essential complement to the path-breaking book Competitive Strategy, Michael E. Porter's Competitive Advantage explores the underpinnings of competitive advantage in the individual firm.

 Competitive Advantage introduces a whole new way of understanding what a firm does. Porter's groundbreaking concept of the value chain disaggregates a company into activities, or the discrete functions or processes that represent the elemental building blocks of competitive advantage.

Competitive Advantage, 1985