As a General Rule,oligopoly Exists When the Four-Firm Concentration Ratio

question 71

Multiple Choice

As a general rule,oligopoly exists when the four-firm concentration ratio:

• A) exceeds the Herfindahl index.
• B) is less than the Herfindahl index.
• C) is 40 percent or more.
• D) is 15 percent or more.

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