长期平均成本曲线是怎么样得到的？
向上倾斜的CC曲线表示厂商数量越多，平均成本越多，各厂商销量越低。交点处为行业的均衡厂商数。
If the number of firms increases, each firm will sell less, so firms will not be able to move as far down their average cost curve.
绘出一家典型企业的边际成本和平均总成本曲线。解释其形状和交点。
Draw the marginal-cost and average-total-cost curves for a typical firm. Explain why the curves have the shapes that they do and why they cross where they do.
这条曲线都是在平均总成本和平均可变成本的最低点分别与它们相交。
It is drawn to intersect both average total cost and average variable cost at their lowest points.
一般来说，平均总成本曲线是什么形状？
In general, what is the shape of the average-total-cost curve?
竞争企业的短期供给曲线是边际成本曲线在平均可变成本曲线以上的那一部分。
The portion of the marginal-cost curve that lies above average variable cost is the competitive firm's short-run supply curve.
竞争企业的短期供给曲线是边际成本曲线在平均可变成本曲线以上的那一部分。
The portion of the marginal-cost curve that lies above average variable cost is the competitive firm's short-run supply curve.
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