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In particular, the definition of the concentration ratio does not use the market shares of all the firms in the industry and does not account for the distribution of firm size. Also, it does not provide much detail about competitiveness of an industry. [1] The following example exposes the aforementioned shortfalls of the concentration ratio.
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 ...
In economics, market concentration is a function of the number of firms and their respective shares of the total production (alternatively, total capacity or total reserves) in a market. [1] Market concentration is the portion of a given market's market share that is held by a small number of businesses.
Unlike the N-firm concentration ratio, large firms are given more weight in the HHI and as a result, the HHI conveys more information. However the HHI has its own limitations as it is sensitive to the definition of a market, therefore meaning you cannot use it to cross-examine different industries, or do analysis over time as the industry changes.
N-firm concentration ratio, N-firm concentration ratio is a common measure of market structure. This gives the combined market share of the N largest firms in the market. [ 9 ] For example, if the 5-firm concentration ratio in the United States smart phone industry is about .8, which indicates that the combined market share of the five largest ...
Supposing that firms share all the market, each one with a participation of and market share = / =, then the index can be expressed as = + (), where is the statistical variance of the firm shares, defined as = = where = is the mean of participations. If all firms have equal (identical) shares (that is, if the market structure is completely ...
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The higher the four-firm concentration ratio is, the less competitive the market is. When the four-firm concentration ration is higher than 60, the market can be classified as a tight oligopoly. A loose oligopoly occurs when the four-firm concentration is in the range of 40-60. [21]