文档介绍：Public Good Demand The demand or benefit from a public good is the sum of the willingness - to pay or benefit by consumers for each unit of the good . Each consumer shares the benefit from each unit of the good . This is unlike a private good , where each consumer gets a private benefit from each unit the consumer purchases without sharing the purchase or benefit with other consumers . Therefore , with a public good the benefit is the sum of the benefits from each consumer that receives a benefit from the unit of output . This is illustrated in the table below : 公共产品的需求和收益是消费者为每单位物品的支付意愿或收益的总和。每一个消费者享有每一单位物品的收益。这不像一个私人物品, 在私人物品中, 每一个消费者在不用与别人一起负担购买和分享收益的情况下, 可以从每一单位的物品购买中得到得到每一单位的私人收益。所以在公共物品中,收益是每个从单位产出得到收益的每个消费者的收益的总和。这将会在下面表格陈述: In the fictitious ( 虚构的) example in the table , the three scientists share a laboratory and are considering jointly purchasing several journal subscriptions . The journal subscriptions would be shared among the scientists . The table simplifies this decision by assuming that the journal subscriptions are similar and the benefit they receive from the first is the highest for all three scientists . The three scientists have mon second choice that they value less ,a third choice , etc ., for the five journals they are considering jointly purchasing subscriptions to. 在表格里虚构的例子中,三个科学家共同享有一间实验室并考虑一起购买几种期刊订阅。期刊订阅将由三个科学家共同享有。通过假设期刊订阅是相似的而且他们从第一本得到的收益是最高的来用表格