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  3. It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.

It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.

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问题     It would be difficult to have a society like ours without public goods such as defense, transportation, and other services.
    A public good is one that a person can use without reducing the use of it for another person. One of the best examples of a pubic good is national defense. One person can benefit from our national defense without reducing another person’s benefits. In fact, it is difficult to keep any person in our society from enjoying the benefits of national defense.
    The market system does not work well in producing public goods. This is because a person who refuses to pay for a public good cannot be kept from using it. Suppose that the neighbors in a high crime area decide to hire a police force. Each neighbor, except Mrs. Smith, agrees to pay $100 a year for it. Mrs. Smith refuses to pay because she knows that if all the others pay the $100, the police will guard the area anyway. So Mrs. Smith can enjoy the services of the police force without paying $100.
    The market system has no way to deal with this type of problem. For this reason, we cannot ask each person to make a direct payment in the form of product price. Therefore, we collect money for public goods by using taxes.  
The person who does not pay for a public good______.
选项 A、keeps himself from using its benefit
B、cannot enjoy its benefit at any time
C、fails to keep its benefit from being used
D、enjoys its benefit all the same
答案D
解析 根据题目中的does not pay for a public good定位到第三段第二句。该句中的because表明原因：人们无法禁止那些拒绝为公共服务付费的人享用公共服务，换句话说，即使拒绝付费，也还是能够享用公共服务的。因此D项的表述正确。
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