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| 恩格尔定律即:随着家庭收入增加，收入中用于食物的开支比例相对减少 | |||
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| 德国统计学家恩格尔定律 (即家庭收入增加, 其用于食物开支比例相对减少) | |||
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| 恩格尔定律 | |||
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| 恩格尔定律 | |||
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