假设消费者的效用函数为:u(x,y)= x a y b ,x和y分别代表两种不同消费品的消费数量,a、b>0。现假设y 为纵轴,x 为横轴,那么消费者的无差异曲线斜率为( )
A.
-bx/ay
B.
-by/ax
C.
-ay/bx
D.
-ax/by
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