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Consider a given market for product X. The total sales of all rms selling the product are $2 million. Ranking the rmssales from highest to
Consider a given market for product X. The total sales of all rms selling the product are $2 million. Ranking the rmssales from highest to lowest, we nd the top four rmssales to be $260,000, $220,000, $150,000, and $130,000. (a) Calculate the four-rm concentration ratio (CR4). (b) Suppose this is all the information we have. We do not have the information to work out the HHI (HerndahlHirschman Index). Can you suggest an upper bound and a lower bound for the HHI
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