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Michael Porter has argued that a firm's strengths ultimately fall into one of two headings: cost advantage and differentiation. By applying these strengths in either a broad or narrow scope, three generic strategies result: cost leadership, differentiation, and focus. These strategies are applied at the business unit level.
Michael Porter is the author of 18 books and numerous articles including Competitive Strategy, Competitive Advantage, Competitive Advantage of Nations, and On Competition. A six-time winner of the McKinsey Award for the best Harvard Business Review article of the year, Professor Porter is the most cited author in business and economics.