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A concentration ratio (CR) is the sum of the percentage market shares of (a pre-specified number of) the largest firms in an industry. An n-firm concentration ratio is a common measure of market structure and shows the combined market share of the n largest firms in the market.
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 ...
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 ...
Understanding the market concentration is important for firms when deciding their marketing strategy. As well, empirical evidence shows that there exists an inverse relationship between market concentration and efficiency, such that firms display an increase in efficiency when their relevant market concentration decreases. [24]
For example, a 4-firm concentration ratio measures the total market share of the four largest firms in an industry. In order to calculate the N-firm concentration ratio, one usually uses sales revenue to calculate market share, however, concentration ratios based on other measures such as production capacity may also be used. For a monopoly ...
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]
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The Theory of the Firm: Critical Perspectives on Business and Management. Taylor and Francis. v. I–IV. Chapter preview links, including Bengt Holmström and Jean Tirole, "The Theory of the Firm," v. I, pp. 148–222; Holmstrom, Bengt R.; Tirole, Jean (1989). "Chapter 2 the theory of the firm". Handbook of Industrial Organization Volume 1. Vol. 1.