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A public good has two attributes: nonexcludability, which means the producer can't prevent the use of the good by others, and nonrivalry, which means that many people can use the good simultaneously.
公共品具备两种特征：一、非排它性：即生产者无法排除购买者以外的其他人使用这一产品，二、非竞争性：意指许多人可以同时使用该产品。
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