The primary difference between private goods and public goods is that:

a. private goods are consumed by private individuals whereas public goods are not consumed by private individuals.
b. private goods often yield externalities but public goods do not
c. property rights can be assigned to public goods but not to private goods.
d. public goods are nonrivalrous in consumption whereas private goods are rivalrous in consumption.

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

there was no passage listed but using the process of elimination i'd say it was d. the high economy would do the opposite. i don't see how low prices would affect it. high unemployment is possible but i feel d is the better answer.