103鐵路高員級 經濟學 (Cournot競爭) - 考試
By Megan
at 2014-06-19T18:17
at 2014-06-19T18:17
Table of Contents
Q21
假設雙占市場上只有甲廠商與乙廠商,且兩家廠商生產的邊際成本皆固定為20,
若兩家廠商進行古爾諾競爭(Cournot Competition),當市場需求為 P=50-Q 時,
則市場均衡價格為:
(A)P=10 (B)P=20 (C)P=30 (D)P=40
答案:(C)
想法:
MCa=20,TCa=40q^0.5
πa= TRa-TCa = (50-qa-qb)*qa-40q^0.5
= 50qa-qa^2-qaqb-40q^0.5
dπa/dqa=0,50-22qa=qb
50-22qb=qa
聯立求解後 答案不對
請教哪裡算錯了呢,謝謝~~
--
假設雙占市場上只有甲廠商與乙廠商,且兩家廠商生產的邊際成本皆固定為20,
若兩家廠商進行古爾諾競爭(Cournot Competition),當市場需求為 P=50-Q 時,
則市場均衡價格為:
(A)P=10 (B)P=20 (C)P=30 (D)P=40
答案:(C)
想法:
MCa=20,TCa=40q^0.5
πa= TRa-TCa = (50-qa-qb)*qa-40q^0.5
= 50qa-qa^2-qaqb-40q^0.5
dπa/dqa=0,50-22qa=qb
50-22qb=qa
聯立求解後 答案不對
請教哪裡算錯了呢,謝謝~~
--
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