Posted by anita on Sunday, December 14, 2008 at 9:03pm.
The concentration ratio is usually thought of as the percent of an industry (i.e., market share) made up of the top 4 (sometimes 5) firms in the industry. If 4/20 = 20% of the firms make up 20% of the industry, then the all firms in the industry must be very close in size and the industry is likely to be highly competitive.
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