Question

city streets, sewage systems, and police protection are all examples of:
a. exclusive goods.
b. luxury goods.
c. private goods.
d. public goods.

Explanation:

City streets, sewage systems, and police protection are non-excludable (people cannot be prevented from using them) and non-rival (one person's use does not reduce availability for others), which are the core traits of public goods. Exclusive, luxury, and private goods do not match these characteristics.

Answer:

d. public goods.