Define total cost, average total cost, and marginal cost. How are they related?
定义总成本，平均总成本，边际成本。它们之间关系是什么？
It is drawn to intersect both average total cost and average variable cost at their lowest points.
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。
Does a firm's price equal the minimum of average total cost in the short run, in the long run, or both? Explain.
企业产品的价格在短期等于最低平均总成本还是长期等于最低平均总成本，还是两者都等于？
How and why does a firm's average-total-cost curve differ in the short run and in the long run?
为何一个企业的短期平均总成本和长期平均总成本不一致？
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.
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。
In general, what is the shape of the average-total-cost curve?
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?
一般来说，平均总成本曲线是什么形状？
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