Cost behavior is considered curvilinear whenever a straight line is a reasonable approximation for the relation between cost and activity.

Question

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If cost behavior is curvilinear, a straight line is not a reasonable approximation for the relation between cost and activity. Instead, the relationship between cost and activity is nonlinear, which means the cost changes at a non-constant rate as the activity changes.

Cost Behavior Is Considered Curvilinear Whenever a Straight Line Is