What importance are average cost and marginal cost in economic analysis?

Answer:
Average cost: determines the accounting profit maximisation and minimal point where the firm can remain profitable.
Marginal cost: determines economic profit maximisation and minimal 'shut-down' point where the firm should still operate, even if at an accounting loss.

Note: Average cost (AC) and marginal cost (MC) are related. The rate of change of AC is always positive when MC is positive.
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