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?