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The Definition and Importance of the Supply and Demand Model 供给需求模型的定义与重要性 Forming the basis for introductory concepts of economics, the supply and demand model refers to the combination of buyers' preferences comprising the demand and the sellers' preferences comprising the supply, which together determine the market prices and product quantities in any given market. 作为经济学入门概念的基础，供给需求模型指的是：买方的偏好构成了需求，卖方的偏好构成了供给，而两者结合起来决定了商品在任意市场形态中的价格和数量。 In a capitalistic society, prices are not determined by a central authority but rather are the result of buyers and sellers interacting in these markets. 在一个资本主义社会中，价格并不是由一个中央权威制定的，而是这些市场中买方和卖方互动的结果。 | 
