If the long-run average total cost curve for a firm is horizontal in a relevant range of production, then it indicates that there (B) are constant returns to scale.
As the description states, if a firm's long-run average total cost curve is horizontal in a relevant production range, it shows that there are consistent returns to scale.
Therefore, if the long-run average total cost curve for a firm is horizontal in a relevant range of production, then it indicates that there (B) are constant returns to scale.
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Complete question:
If the long-run average total cost curve for a firm is horizontal in a relevant range of production, then it indicates that there
A. isn't a minimum efficiency scale.
B. are constant returns to scale.
C. are diseconomies of scale.
D. are economies of scale.