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当前学科：一、经济学相关理论知识在物业管理中的应用
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对于价格机制在某些领域不能起有效作用的情况我们称之为市场失灵，导致市场失灵的原因主要有（）。
A . 垄断的存在
B . 自由竞争的存在
C . 非对称信息
D . 外部性
E . 公共产品
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