【单选题】【消耗次数：1】
用实物交换模型中介绍的无差别曲线的概念，讨论雇员和雇主之间的协议关系，若以雇员一天的工作时间t和工资w分别为横坐标和纵坐标，画出雇员无差别曲线族的示意图，以下分析正确的是（ ）
①
工作时间越长，则雇员的工资应越高，曲线应该是上升的。
②
雇员希望工资的增长率大于工作时间的增长率，曲线应该为上凸的。
③
工作时间越长，则雇员的工资应越高，曲线应该是下降的。
④
雇员希望工资的增长率小于工作时间的增长率，曲线应该为下凸的。
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