选择题:商品X和Y的价格按相同的比率上升,而收入不变,预算线( )

题目内容:
商品X和Y的价格按相同的比率上升,而收入不变,预算线( )

选择一项:
A. 向左下方平行移动
B. 不变动
C. 向右上方平行移动
D. 向左下方或右上方平行移动
参考答案:

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