今年普考經濟學概要第17題(已解決) - 普考
By Edward Lewis
at 2014-07-05T17:43
at 2014-07-05T17:43
Table of Contents
一完全競爭廠商的邊際成本函數為SMC=q^2 -8q +20,
平均變動成本函數為AVC=(1/3 q^2)-4q+20,
固定成本為100,當價格為68時,其生產者剩餘為?
A.376 B.476 C.576 D.675
補習班的答案是B.476
請教各位怎麼計算的?
我用利潤函數一階微分=0求出q=12,但是二階微分應該要<0才能成立...偏偏就不是<0,
然後就卡住了。
請求各位指教。
--
平均變動成本函數為AVC=(1/3 q^2)-4q+20,
固定成本為100,當價格為68時,其生產者剩餘為?
A.376 B.476 C.576 D.675
補習班的答案是B.476
請教各位怎麼計算的?
我用利潤函數一階微分=0求出q=12,但是二階微分應該要<0才能成立...偏偏就不是<0,
然後就卡住了。
請求各位指教。
--
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