a. Calculate the four-firm concentration ratios for 2006 and 2011. Analyze the industry changes during this five-year period.

b. Calculate the eight-firm concentration ratios for 2006 and 2011. Does this index give you any different indication about changes in the industry over the same period?

c. Calculate the Herfindahl-Hirschman Indexes for 2006 and 2011. What information does this index tell you about changes in the industry? How does this information differ from the four-firm and eight-firm indexes?

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Market Share 2006 Market Share 2011 Firm A 10% 32% 8% 5% 12% 12% 20% 29% 21% 9% 2% 1% 5% 4% 2% Н 6% B. D.