来源: 99年台大研究所 科目: 经济分析 问题: 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:平均总成本 MR:边际收入 MC:边际成本 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: 这三个叙述感觉都和长期均衡不冲突阿...所以我选(A) 但我这边的参考解答是给(C) 还是这题目的意思其实是问哪个叙述能直接判断为长期均衡? 不好意思 还有一题顺便在同一篇问... ---- 来源: 98年台北企管 科目: 经济学 问题: 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. 请问这题是在问什麽观念还是理论? 读书的时候没印象看过类似的部分... 直觉下去写的话 我是看它有提到"perfect certainty" 可能是指可以预知未来市场发展? 所以我选(B) 但解答是给(A) 但若照A的叙述 以长期收入极大为目标为何一定会破产呢? 搞不懂... 希望有人能指出我的盲点 回答任何一题都很感谢! --

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