In the long run, with an increase in the plant size, _____ . A. The short-run average

Question:

In the long run, with an increase in the plant size, _____ .
A. The short-run average total cost curve shifts downward
B. The long-run average cost curve slopes downward
C. The short-run average total cost curve shifts downward if economies of scale exist
D. The average total cost of production rises

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