Explain the meaning of a four-firm concentration ratio


What is the meaning of a four-firm concentration ratio? Interpret what a four-firm concentration ratio of 60 % would mean. Interpret what a score of 90% would mean for the four-firm concentration ratio. What are the shortcomings of concentration ratios as measures of monopoly or oligopoly power? These concepts are discussed in the textbook reading for this week.

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Microeconomics: Explain the meaning of a four-firm concentration ratio
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