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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.
The main challenge for business strategy is to find a way of achieving a sustainable competitive advantage over the other competing products and firms in a market. A competitive advantage is an advantage over competitors gained by offering consumers greater value, either by means of lower prices or by providing greater benefits and service that justifies higher prices. Porter suggested four generic business strategies that could be adopted in order to gain competitive advantage.