consumption quantity index
... 消费-收入关系式 consumption-income relation 消费数量指数 consumption quantity index 消费水平 consumption level ...
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多数经济学家认为居民消费价格指数（CPI）的计算方法才是正确的，因为这个公式模仿了那些购买数量很少而价格却相对比较高的物品的消费者的行为。
Most economists think that the CPI method is the right one, because its formula mimics the behaviour of consumers, who buy less of a product that is becoming relatively dearer.
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