学校小考的题目 可是想不出是为什麽 Suppose that Martin owns a lighthouse, and Lewis owns a bearby port. Martin's lighthouse benefits only those ships that enter Lewis's port. Which of the following statements is "not" correct? A. Martin's lighthouse may be considered a private good. B. Martin can reduce the free-rider problem by charging Lewis a usage fee. C. Martin can exclude Lewis's port form benefiting from the lighthouse by simply truning the power off. D. Martin's lighthouse may be considered a common resource. 答案是d 不过我不知道d错在哪? 我觉得a也是错的 感觉应该是无法排它 也不具敌对性 想请高手帮忙解答一下 谢谢~ --

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