The Figure Given Below Shows the Aggregate Demand and Supply

Multiple Choice

The figure given below shows the aggregate demand and supply curves of a perfectly competitive market.Figure 10.7

-Barriers to entry do not occur when:

A) economies of scale in production exist in an industry.
B) firms requires a professional license or franchise agreement.
C) the firm that introduces a product is granted a patent.
D) a firm controls a scarce resource.
E) diseconomies of scale in production exist in an industry.