Based on class notes, match the definitions below to the appropriate term.

A$.$ occurs when the value of using a system positively depends on the number of other system users.

A$.$ A positive network extenality

C$.vv$ is generally defined as something that makes it difficult to start a new business in an

$8.$ Economies of scale industry.

C$.$ A barrier$-$to$-$entry

is defined as a reduction in unit average cost achieved by spreading fixed costs over a D$.$A commodity high volume of units.

is defined as something that makes it difficult to change from one provider to a

E$.$ A switching cost competing provider of some product or service.

F$.$ A digital product is a product that can be delivered over a telecommunications network. is a product that cannot be differentiated $($e$.$g$.$ all units are the same$)$