【多选题】【消耗次数：1】
劳动力需求( )。
①
是一种派生需求
②
是有效需求
③
是雇主对劳动力所有权的购买
④
取决于生产要素的替代能力
参考答案：
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在其他条件不变时，下列关于劳动力需求正确的说法是（）
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劳动力需求随工资率提高而减少
②
劳动力需求随工资率提高而增加
③
无论工资率如何变化，劳动力需求始终减少
④
无论工资率如何变化，劳动力需求始终增加
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