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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. Now an essential part of international business thinking, COMPETITIVE ADVANTAGE takes strategy from broad vision to an internally consistent configuration of activities. Its powerful framework provides the tools to understand the drivers of cost and a company s relative cost position. Porter s value chain enables managers to isolate the underlying sources of buyer value that will command a premium price, and the reasons why one product or service substitutes for another. He shows how competitive advantage lies not only in activities themselves but in the way activities relate to each other, to supplier activities, and to customer activities. That the phrases competitive advantage and sustainable competitive advantage have become commonplace is testimony to the power of Porter s ideas. COMPETITIVE ADVANTAGE has guided countless companies, business school students, and scholars in understanding the roots of competition. Porter s work captures the extraordinary complexity of competition in a way that makes strategy both concrete and actionable.