兩題關於市場的觀念題 - 經濟

來源: 99年台大研究所

科目: 經濟分析

問題:

Assume the following for a certain industry:

(1) there is no incentives for firms to enter or exit the industry;
(2) for some firms in the industry, short-run ATC is greater than long-run
ATC at the level of output where MR=MC
(3) all firms in the industry are currently producing the quantity of
output at which MR=MC.
ps. ATC:平均總成本 MR:邊際收入 MC:邊際成本
Is the industry in long-run competitive equilibrium?

(A) Yes.
(B) No, because of (2)
(C) No, because of (2) and (3)
(D) No, because of (1) and (2)
(E) No, because of (1), (2), and (3)


我的想法:

這三個敘述感覺都和長期均衡不衝突阿...所以我選(A) 但我這邊的參考解答是給(C)

還是這題目的意思其實是問哪個敘述能直接判斷為長期均衡?

不好意思 還有一題順便在同一篇問...

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來源: 98年台北企管

科目: 經濟學

問題:

If there is perfect certainty, a competitive firm will necessarily

(A) seek to maximize its immediate profits rather than long-run returns

because otherwise it will go broke.

(B) maximize the ratio of the present value of its sales to the present value

of its cost.

(C) equalize its profits in all periods.

(D) equalize its sales in all periods.

(E) none of the above.


請問這題是在問什麼觀念還是理論? 讀書的時候沒印象看過類似的部分...

直覺下去寫的話 我是看它有提到"perfect certainty"

可能是指可以預知未來市場發展? 所以我選(B) 但解答是給(A)

但若照A的敘述 以長期收入極大為目標為何一定會破產呢? 搞不懂...


希望有人能指出我的盲點 回答任何一題都很感謝!

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