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Market dominance
There are several ways of calculating market dominance. The most direct is market share. This is the percentage of the total market serviced by a firm or brand. A declining scale of market shares is common in most industries that is, if the industry leader has say 50% share, the next largest might have 25% share, the next 12% share, the next 6% share, and all remaining firms combined might have 7% share. Market share is not a perfect proxy of market dominance. The influences of customers, suppliers, competitors in related industries, and government regulations must be taken into account. Although there are no hard and fast rules governing the relationship between market share and market dominance, the following are general criteria Market shares within an industry might not exhibit a declining scale. There could be only two firms in a duopolistic market, each with 50% share; or there could be three firms in the industry each with 33% share; or 100 firms each with 1% share. The concentration ratio of an industry is used as an indicator of the relative size of leading firms in relation to the industry as a whole. One commonly used concentration ratio is the four-firm concentration ratio, which consists of the combined market share of the four largest firms, as a percentage, in the total industry. The higher the concentration ratio, the greater the market power of the leading firms.
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