教甄◆英文-國小題庫下載題庫

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 ship of any nationality can be effectively excluded from the utilization of the lighthouse for navigational purposes. National defense is another example. Even a person who__38___ military expenditures or did not pay any taxes will benefit from the protection provided. 

It is no easy task to determine the social costs and social benefits ___39__ a public good. There is no practicable way of charging drivers for looking at highway signs, sailors for watching a lighthouse, and citizens for the security provided to them through national defense. Because the market does not provide the necessary signals, economic analysis ___40__ for the impersonal judgment of the marketplace.