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[考題] 103身障三等 經濟學 (供需價格)
Jun 10th 2014, 23:05, by kirok

作者kirok (寂靜)

看板Examination

標題[考題] 103身障三等 經濟學 (供需價格)

時間Tue Jun 10 23:05:37 2014

Q.23 假設稻米的市場需求函數是 q=a－bp，q, p 分別是市場需求量與價格，a, b > 0， 則使全體稻農總收益最大的價格是： (A) a/2 (B) a/2b (C) a/3b (D) 2a/3b 答案:(B) 求總收益最大，TR=P*Q 直接把各選項的值丟進去相乘找最大者嗎？ 或是有較快速的判斷解法？ 謝謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 114.41.244.167 ※ 文章網址: http://www.ptt.cc/bbs/Examination/M.1402412741.A.FE5.html

推 lovewhite:TR最大時 MR=0 MR=a/b-2q/b=0 =>q=a/2 帶回需求函數 06/10 23:13

→ lovewhite:得到P=a/2b 06/10 23:14

→ kirok:原來要以獨占市場去解題，懂了!! 非常感謝~ 06/10 23:25

推 akai0928:與獨不獨占無關…真的懂了嗎… 06/10 23:28

→ kirok:應該說面對負斜率的需求線,TR最大時,MR=0 這樣沒錯吧 06/10 23:31

推 mousekeep56:TR=P*Q 對p一次微分=0 不就是B了 @@ 06/10 23:34

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