问

问题如下：

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 where 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 a long-run average cost curve (LRAC) with a negative slope.

考点：规模经济

解析：经济规模阶段，产量的增加会导致单位成本的降低。A不入选

在长期总成本曲线上，这表示为曲线下降的阶段，即曲线的斜率为负。B入选

该阶段位于曲线最低点的左侧而非右侧。C不入选