以下为句子列表：
英文: It begins with the scarcity hence competition postulate; it views economics as a theory of choice subject to constraints; it employs price theory as an essential part of the analysis of institutions; and it sees changes in relative prices as a major force
中文: 它开始于稀缺和竞争假设；它把经济学看成是受约束的选择理论；它把价格理论用作为制度分析的必要部分；而且它把相对价格的变化看成是导致制度变迁的主要力量。
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英文: Hedonic price theory has some advantages, and is a practical method to research urban housing price.
中文: 特征价格理论在研究城市商品住宅价格上具有一定的优势,它是目前我国研究城市商品住宅价格的实用方法。
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