The principle of nonexclusion for pure public goods means that the benefits of the good:

Question

BlackTom AI · Accepted Answer

Nonexclusion means that no one can be prevented from enjoying the good’s benefits, even if they do not pay for it.

1. Relevant knowledge points and concepts
- Public goods are characterized by nonexcludability and nonrivalry. Nonexcludability (nonexclusion) means individuals cannot be effectively excluded from using the good. Nonrivalry means one person’s consumption does not reduce another’s enjoyment. Examples: national defense, public fireworks, lighthouse signals. The “free-rider” problem arises when nonexclusion prevents charging users.

2. Step-by-step reasoning
- Identify the phrase “principle of nonexclusion for pure public goods” as referring to nonexcludability.
- Translate that to behavior of benefits: if a good is nonexcludable, providers cannot withhold the benefits from nonpayers.
- Therefore, whether a consumer pays or refuses to pay, they still receive the good’s benefits when the good is provided.

3. Calculations and intermediate steps
- No numerical calculation is required. The logical intermediate steps are: public good → nonexcludability → inability to exclude nonpayers → benefits cannot be withheld from consumers who don’t pay.

4. Why the correct answer is correct
- The option “cannot be withheld from consumers even if they refuse to pay” exactly captures nonexcludability: benefits of the public good are accessible to all once provided, making exclusion infeasible. This statement directly states the essence of the nonexclusion principle.

5. Why the other options are incorrect
- “Are shared”: vague and incomplete; shared could describe many goods and does not specify the inability to exclude nonpayers. 
- “Can be priced”: incorrect because nonexcludability typically prevents effective pricing or charging individual users.
- “Are not reduced to any one consumer when a given quantity is consumed by another”: this describes nonrivalry (consumption by one does not reduce availability to others), not nonexclusion.

6. Conclusion
The correct answer is “cannot be withheld from consumers even if they refuse to pay,” which matches the provided answer and accurately reflects the principle of nonexclusion for pure public goods.

The principle of nonexclusion for pure public goods means that the benefits of the good:单项选择题

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