【简答题】【消耗次数：1】
需求理论表明，需求量与价格成反方向变动，这个规律的根源在于_____ 。
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相关题目
【单选题】
正常物品价格上升导致需求量减少的原因在于（）。
①
替代效应使需求量增加，收入效应使需求量减少
②
替代效应使需求量增加，收入效应使需求量增加
③
替代效应使需求量减少，收入效应使需求量减少
④
替代效应使需求量减少，收入效应使需求量增加
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