What is the concentration ratio in the industry


There are six firms in the industry. Suppose their sales in the year 2006 are as follows:

Firm   Sales (10 millions of dollars)

A                    100
B                     80
C                     50
D                     40
E                      40
F                      20

Question 1. What is the concentration ratio in the industry

(a) if you use the four-firm concentration ratio;

(b) if you use the HHI index.

Question 2. Would you regard this industry as oligopolistic? Why or why not?

Question 3. Suppose that firm A merges with firm F. What now will be the concentration ratio in the industry?

Question 4. Suppose that after they merge, firms A and F go out of business. What now will be the concentration ratio in this industry?

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