【单选题】【消耗次数：1】
短期边际成本曲线呈U型，是因为
①
技术水平变化
②
要素价格先上升后下降
③
要素价格先下降后上升
④
边际产量先递增后递减
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相关题目
【单选题】
边际成本递增规律是：在一定的生产技术条件下，随着产量增加，边际成本开始时，逐渐下降，当边际成本下降到一定程度时，再增加产量边际成本会（）。
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大幅减少
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不变
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以上答案都不正确
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