All of the following are barriers to entry except

A) network effects.
B) control of scarce resources.
C) externalities.
D) economies of scale.

Barriers To Entry

Factors that make it difficult for new firms to enter an industry, such as high initial investment, legal restrictions, or strong brand loyalty among consumers.

Network Effects

The phenomenon whereby increased numbers of people or participants improve the value of a good or service.

Economies Of Scale

The benefit that larger operations have, which allows them to produce goods or services at a lower unit cost as production scales up.