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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。
Unlike a physical market, however, buyers and sellers don't have to all be in the same place, they just have to be looking to conduct the same economic transaction.
不过，这里和有形的市场不同，买方和卖方并不需要同时处在一个地方，他们只需要期望进行同一场经济交易即可。
It's important to keep in mind that prices and quantities are the outputs of the supply and demand model, not the inputs.
有一个很重要的点需要记住，那就是：价格与数量都是由供给需求模型决定的结果，而不是它的决定因素。
It's also important to keep in mind that the supply and demand model only applies to competitive markets — markets where there are many buyers and sellers all looking to buy and sell similar products.
还有一点很重要的是：供给需求模型仅适用于竞争性市场——也就是有很多买方和卖方想在此交易相似商品的地方。
Markets that don't satisfy these criteria have different models that apply to them instead.
那些不满足这些要求的市场则适用不同的模型。
The Law of Supply and The Law of Demand
供给需求模型的法则
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