单选题:市场需求的调查中,(  )是指现时无法实现,但随着收入水平的提高或商品价格的降低等因素的变化,在今后可以实现的需求。

题目内容:
市场需求的调查中,(  )是指现时无法实现,但随着收入水平的提高或商品价格的降低等因素的变化,在今后可以实现的需求。 A.有效需求
B.潜在需求
C.增长需求
D.供应需求

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