When network externalities are present:

A) we can obtain the market demand curve simply by summing individuals' demands.
B) one person's demand also depends on the demands of other people.
C) a person's demand cannot be affected by the number of other people who have purchased the good.
D) the social cost of production is larger than the private cost.

Network Externalities

The effect that the number or size of users of a product or service has on the value of that product or service to other users.

Market Demand Curve

A graphical representation showing the relationship between the price of a good and the quantity of that good that all consumers in the market are willing to purchase at each price point.

Individuals' Demands

A reference to the total quantity of a good or service that an individual consumer is willing and able to purchase at various prices.