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1. Suppose that the distribution of sales within an industry is as shown in the

ID: 1100161 • Letter: 1

Question

1.       Suppose that the distribution of sales within an industry is as shown in the table.

                                            

Firm

               Share   of Total Market Sales

A

13

B

10

C

8

D

7

E

5

F

4

G

2

H

2

All Other

49

Total

100%

a)      What is the four-firm concentration ratio for this industry? ____

b)      What is the eight-firm concentration ratio for this industry? ____

  

Firm

     

               Share   of Total Market Sales

     

A

     

13

     

B

     

10

     

C

     

8

     

D

     

7

     

E

     

5

     

F

     

4

     

G

     

2

     

H

     

2

     

All Other

     

49

     

Total

     

100%

  

Explanation / Answer

a)      What is the four-firm concentration ratio for this industry? answer: 38%

b)      What is the eight-firm concentration ratio for this industry? answer: 51%