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According to Porter, the nature of competitiveness in a given industry can be viewed as a composite of five forces: 1) Rivalry among competing firms, 2) Potential entry of new competitors, 3) Potential development of substitute products, 4) Bargaining power of suppliers, & 5) Bargaining power of consumers. Rivalry among competing firms is usually the most powerful of the five competitive forces. The strategies pursued by one firm can be successful only to the extent that they provide competitive advantage over the strategies pursued by rival firms. Changes in strategy by one firm may be met with retaliatory countermoves, such as lowering prices, enhancing quality, adding features, providing services, extending warranties, and increasing advertising. The intensity of rivalry among competing firms tends to increase as the number of competitors increases, as competitors become more equal in size and capability, as demand for the industry's products declines, and as price cutting becomes common. Rivalry also increases when consumers can switch brands easily; when barriers to leaving the market are high; when fixed costs are high; when the product is perishable; when consumer demand is growing slowly or declines such that rivals have excess capacity or inventory; when the products being sold are commodities (not easily differentiated, such as gasoline); when rival firms are diverse in strategies, origins, and culture; and when mergers and acquisitions are common in the industry. As rivalry among competing firms intensifies, industry profits decline, in some cases to the point where an industry becomes inherently unattractive.
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