A firm encountering economies of scale over some range of output will have a

A) rising long-run average cost curve.
B) falling long-run average cost curve.
C) flat long-run average cost curve.
D) rising, then falling, then rising long-run average cost curve.

Long-run Average Cost

The average cost per unit of output over a long period, where all inputs can be adjusted by firms. This includes the cost of changing production levels and entering or exiting an industry.

Economies of Scale

Economies of scale refer to the reduced costs per unit that businesses experience as their operation size increases, typically resulting in lower costs per unit as the scale expands.