【单选题】【消耗次数：1】
随着产量的增加,平均固定成本（）
①
在开始时下降,然后趋于上升
②
在开始时上升,然后趋于下降
③
一直趋于上升
④
一直趋于下降
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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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