Q. A good that is non-rivalries and non-excludable, and whose benefits can not be prices and therefore to which the principle of exclusion does not apply comes under the following heading?
Answer: Pure Public Goods
Notes: Pure public goods are goods or services that are both non-excludable and non-rivalrous in consumption. Non-excludable means that it is impossible to prevent anyone from using the good or service, once it is provided. Non-rivalrous means that one person's use of the good or service does not diminish its availability to others. Examples of pure public goods include national defense, clean air, and knowledge. Because pure public goods are both non-excludable and non-rivalrous, they are often provided by the government, since it is difficult for private businesses to exclude people from using them or to charge them for their use.

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