The following table represents the market share percentage for each firm in a hypothetical industry.

a. Calculate the four-firm concentration ratio for this industry.
b. Calculate the Herfindahl-Hirschman Index (HHI) for this industry.
c. Would the justice department consider this industry as un-concentrated, moderately concentrated, or concentrated? Why?
d. Suppose firms B.D and F wanted to merge. What would be the value of the 1-1HI following this merger? Would the justice department most likely challenge this merge? Why or why not?

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A B C Firm D E F G H Market Share 19 11 15 12 20 10