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【多选题】
以下关于需求价格弹性大小与销售收入的论述中,正确的是A.
如果商品富有弹性，则降价可以扩大销售收入
B.
如果商品缺乏弹性，则提高价格可以增加销售收入
C.
如果商品富有弹性，则降价可以提高利润
D.
如果商品为单位弹性，则价格对销售收入没有影响
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