[請益] 有關完全競爭市場的成本遞增產業
這是在高勝銘個經經典題型看到的題目~~
原文: The long-run market supply curve is likely to slope upward if
選項:(A) additional firms are attracted into the industry in the long run
(B) not all firms have the same costs of production
(C) diminishing marginal product sets in
(D) there are no barriers to entry in the industry
(E) economies of scale exist
講義答案為B
個人想法：本來選Ｃ，後來仔細思考發現Ｃ是會造成ＬＡＣ遞增，應該是
規模不經濟才對。
講義上說會造成長期產業供給線正斜率的原因有（Ｂ）
以及外部不經濟，卻未說明為什麼。請問有誰可以告訴我為何（Ｂ）
可以造成長期產業供給線正斜率嗎？
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