Which of the following "goods" is the best example of a pure public good?

Question

Quizplus · Accepted Answer

National defense is the best example of a pure public good because it is non-excludable and non-rivalrous. Non-excludable means that it is impossible to exclude someone from benefiting from national defense once it is provided. Non-rivalrous means that one person's consumption of national defense does not diminish another person's consumption. Highways, mail delivery, and welfare programs are not pure public goods because they are at least partially excludable and/or rivalrous in nature.

Which of the Following "Goods" Is the Best Example of a Pure