 This topic has 3 replies, 2 voices, and was last updated Aug2010:28 pm by Zee Tan.

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Up::18
Hi I hope everyone is doing well. i have a few questions that I am not sure i fully understand. Thank you in advance to whoever can help.
I understand calculating before the merger 80%. but, after the merger. I don’t understand why the last F10% is not included in the answer below
Below is the market share of firms in the FMCG industry. The market shares are before merger of A and B.
A â€“ 30%
B â€“ 20%
C â€“ 15%
D â€“ 15%
E â€“ 10%
F â€“ 10%
What is the 4firm concentration ratio before and after merger?
A Before merger â€“ 75%, after merger â€“ 90%
B Before merger â€“ 80%, after merger â€“ 90%.
C Before merger â€“ 85%, after merger â€“ 95%.
Explanation:
B is Correct.
NFirm concentration ratio: It is the sum of the market shares of the largest N firms. It is almost zero for perfect competition and 100 for monopoly.
The 4firm concentration ratio before the merger is 30 + 20 + 15 + 15 = 80%. After the merger of A and B, the ratio will be 50 + 15 + 15 + 10 = 90%. This industry is highly concentrated. Section 7. LO.g.
Same with this question. i got the first part of the question correct. but, not the second part.
Below is the market share of firms in the FMCG industry. The market shares are before merger of A and B.
A â€“ 30%
B â€“ 20%
C â€“ 15%
D â€“ 15%
E â€“ 10%
F â€“ 10%
What is the 4firm HHI before and after merger?
A Before merger â€“ 0.170, after merger â€“ 0.305.
B Before, merger â€“ 0.175, after merger â€“ 0.350.
C Before merger â€“ 0.175, after merger â€“ 0.305
Your answer was Correct.
Explanation:
C is correct. Before merger 4firm HHI = 0.30Â² + 0.20Â² + 0.15Â² + 0.15Â² = 0.175.
After merger 4firm HHI = 0.50Â² + 0.15Â² + 0.15Â² + 0.10Â² = 0.305
Section 7.


Up::1
Firms before merger:
A â€“ 30%B â€“ 20%C â€“ 15%D â€“ 15%E â€“ 10%F â€“ 10%
So the firms used in the 4firm concentration ratio are A, B, C and D (4 top firms) = 30 + 20 + 15 + 15 = 80%.
HHI also uses the same 4 top firms.
After the merger, the firms will look like this:
NewCo â€“ 30% + 20% = 50%C â€“ 15%D â€“ 15%E â€“ 10%F â€“ 10%
So the firms used in the 4firm concentration ratio and HHI are NewCo, C, D and E (4 top firms).
Therefore 4firm concentration ratio after merger = 50 + 15 + 15 + 10 = 90%.
HHI therefore = 0.50Â² + 0.15Â² + 0.15Â² + 0.10Â² = 0.305



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