单选题:在价格为100元时,商品的需求价格弹性为0.5,则价格下跌到99元时,需求量将(  )

题目内容:
在价格为100元时,商品的需求价格弹性为0.5,则价格下跌到99元时,需求量将(  ) A.下降50%
B.上升50%
C.下降0.5%
D.上升0.5%
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