【单选题】【消耗次数：1】
供给曲线是一条倾斜曲线，其倾斜的方向为（ ）
①
右下方
②
右上方
③
左下方
④
左上方
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什么是菲利普斯曲线？为什么向右下方倾斜？
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ideas
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information
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should
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