External Economies of Scale Arise When the Cost Per Unit

Multiple Choice

External economies of scale arise when the cost per unit

A) falls as the industry grows larger and rises as the average firm grows larger.
B) rises as the industry grows larger and falls as the average firm grows larger.
C) falls as the industry and the average firm grows larger.
D) remains constant over a broad range of output.
E) rises as the industry and the average firm grows larger.