Which of the following costs exhibits both decreasing and increasing marginal costs over a specific range of activity?

Which of the following costs exhibits both decreasing and increasing marginal costs over a specific range of activity? 




A. Semivariable cost.
B. Curvilinear cost.
C. Step-fixed cost.
D. Step-variable cost.
E. Fixed cost.


Answer: B. Curvilinear cost.


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