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【单选题】
已知一件衬衫的价格为 80元,一份肯德基快餐的价格为20元,在某消费者关于这两种商品的效用最大化的均衡点上,一份肯德基快餐对衬衫的边际替代率MRS是( )A.
0.25
B.
4
C.
0.4
D.
2.5
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