单选题 Which of the following most accurately describes the shapes of the average variable cost (AVC) curve and the average cost (AC) curve?
  • A. The AVC curve and the AC curve are both U-shaped.
  • B. The AVC curve is U-shaped and the AC curve declines initially then flattens.
  • C. The AVC curve declines initially then flattens and the AC curve is U-shaped.
【正确答案】 A
【答案解析】[解析] 由下图可知，AVC曲线和AC曲线均为U形。 [*]