NO.PZ2023061903000097
问题如下：
Q. A company is experiencing economies of scale when:选项：
A.cost per unit increases as output increases.
B.it is operating at a point on the LRAC curve at which the slope is negative.
C.it is operating beyond the minimum point on the long-run average total cost curve.
解释：
B is correct. Economies of scale occur if, as the firm increases output, cost per unit of production falls. Graphically, this definition translates into an LRAC with a negative slope.
请问B和C选项什么意思
