Question: As a general rule, oligopoly exists when the four - firm concentration ratio is 4 0 percent or more. yields a Herfindahl index below 5

As a general rule, oligopoly exists when the four-firm concentration ratio
is 40 percent or more.
yields a Herfindahl index below 500.
is 50 percent or more.
equals the Herfindahl index.
As a general rule, oligopoly exists when the four

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