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the top four firms in industry A have market shares of 30, 25,10,and 5 percent, respectively. The top firms in industry B have market shares of...

the top four firms in industry A have market shares of 30, 25,10,and 5 percent, respectively. The top firms in industry B have market shares of 15,12,8,and 4 percent,repectively. Calculate the four-firm concentration ratios for the two industries. Which industry is more concentrated?

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