The Regional Public Goods Initiative (RPGI) supports countries in Latin America and the Caribbean and has provided US$73 million finance for the provision of public goods across the region.
RPGI支持拉丁美洲以及加勒比海区域的国家并且给予了7300万美金的财政支持以帮助跨区月的公共货物。
请阅读下面的文献并回答下面几个关于公共货物的选项哪个是对的？
(Source： adapted from http-yAvww.iadb.org/en/topics/regional-integratiori/ what-is-the-regional-puWic-goods-program,2803.html)
A The private sector is able to exclude people from consuming public goods
B They may be under provided by the private sector
C There is rivalry in the consumption of public goods
D They are only available to some consumers
(a) Answer
(b) Explanation
请选择答案，并解释。
来源：2015年1月Edexcel考试局 I A-Level 阶段Economics考试 Unit 1
参考答案：B
Explanation:
Definition of public goods: non-rivalrousand non-excludable. Non-rivalrous means that consumers are not in competition regarding consuming the good; non-excludable means that producers can not effectively exclude the non-payers from receiving the good.
Examples of public goods include street-lighting,national defence, etc.
A:the private sector can exclude the non-payers from receiving the good as the price act as a signal of resource allocation
B:due to the non-excludable nature of public goods, suppliers have no incentive to produce them as they are unable to extract profits from public goods due to free riding. Hence public goods are usually under-provided by the private sector suppliers
C:public good consumption is non-rivalrous
D:if public goods are only available to some consumers, this suggests exclud ability
解题思路
做选择题时最好的办法就是使用排除法。
对于这种类型的题目考生应该注意这样的语句，这些语句或许是在谈论公共商品的特点。清除错误选择最快速方法将是查看所有关于私人货品的描述。
不要忘记，您始终应该通过问题中给出的关键词的定义开始作答。
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