If more people find jobs, the unemployment rate will definitely fall

Which of the following is an example of a product that is excludable and rival?

A) a motorcycle B) the court system C) Western lowland gorillas D) a NASCAR event

A two-way network that links users and in which the per-unit value of the service increases as the size of the network increases is a:

A. negative externality known as a direct network externality. B. positive externality known as a direct network externality. C. negative externality known as an indirect network externality. D. positive externality known as an indirect network externality.