... 互补品（Complementary Goods） 正常商品与低档商品（Normal Goods and Inferior Goods） 吉芬商品（Giffen Goods） ...
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normal goods and inferior goods
正常商品和次品
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Economists call the things that we spend larger portions of our income on as we get more income superior goods, those that stay static as a portion normal ones and those that shrink as a percentage inferior.
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