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【单选题】
若一个模型仅有两种商品,假定这两种商品的边际总效用是正的,下列陈述中哪一个不能从这一假定中推断出?
A.
消费者的无差异曲线是向下倾斜的
B.
没有两条无差异曲线会相交
C.
无差异曲线凹向原点
D.
沿着任何从原点出发的射线，无差异曲线离原点愈远，所代表的效用就愈高
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