Competitive Advantage: Creating and Sustaining Superior PerformanceThe 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