【李明哲】評論

（A）關聯（B）感謝（C）無（D）除

【Moomin White】評論

缺少文章內容Public goods are those commodities from whose enjoyment nobody can be effectively excluded. Everybody is free to enjoy the benefits of these commodities, and one person’s utilization does not reduce the possibilities of anybody else’s enjoying the same good. Examples of public goods are not as rare as one might expect. A flood control dam is a public good. Once the dam is built, all persons living in the area will benefit—___36__ their own contribution to the construction cost of the dam. The same __37___ for highway signs or aids to navigation. Once a lighthouse is built, no sh...