作为经济学介绍性概念的基础，供求模型是指包括需求的买方偏好和包括供应的卖方偏好的组合，它们共同决定任何给定市场的市场价格和产品数量。在资本主义社会，价格不是由中央政府决定的，而是买卖双方在这些市场相互作用的结果。然而，与实物市场不同，买卖双方不必在同一个地方，他们只需要进行同样的经济交易。重要的是要记住，价格和数量是供需模型的输出，而不是输入。同样重要的是要记住，供需模型只适用于竞争性市场——有许多买家和卖家都希望购买和销售类似产品的市场。不满足这些标准的市场具有不同的模型，而适用于它们。供求模型可以分为需求规律和供给规律两部分。根据需求定律，供给价格越高，对该产品的需求量就越低。法律本身规定，“其他条件都一样，随着产品价格的上升，需求量下降；同样，随着产品价格的下降，需求量增加。”这在很大程度上与购买更贵物品的机会成本相关，其中预期是：购买者必须放弃消费他们更看重的东西来购买更贵的产品，他们很可能会想买得更少。类似地，供给定律与将在特定价格点销售的数量相关。本质上与需求定律相反，供给模型表明，价格越高，由于营业收入的增加而提供的数量越高，取决于以更高的价格销售更多的产品。需求中的供给之间的关系在很大程度上依赖于维持两者之间的平衡，其中市场中的供给永远不会比需求多或少。 想想在现代应用中，以15美元发行的新DVD为例。因为市场分析已经表明，现在的消费者不会在电影价格上花费太多，所以公司只发行100份，因为供货商的机会成本对于需求来说太高了。但是，如果需求增加，价格也会增加，导致供应量增加。相反，如果发行100张，需求量只有50张DVD，那么试图销售市场不再需要的其余50张DVD的价格就会下降。供求模型中固有的概念进一步为现代经济学讨论提供了支柱，特别是当它适用于资本主义社会时。没有对这个模型的基本理解，几乎不可能理解复杂的经济理论世界。
英国谢菲尔德大学经济学Essay代写:供求模型
As the basis of introductory concepts in economics, supply and demand model refers to a combination of buyer’s preferences including demand and seller’s preferences including supply, which together determine market prices and product quantities in any given market. In capitalist society, prices are not determined by the central government, but by the interaction between buyers and sellers in these markets. However, unlike the real market, buyers and sellers do not have to be in the same place, they only need to do the same economic transactions. It is important to remember that price and quantity are the output of the supply and demand model, not the input. It is also important to remember that the supply-demand model applies only to competitive markets, where many buyers and sellers want to buy and sell similar products. Markets that do not meet these criteria have different models that apply to them. The supply and demand model can be divided into two parts: demand law and supply law. According to the law of demand, the higher the supply price, the lower the demand for the product. The law itself stipulates that “all other conditions are the same, as the price of the product rises, the demand decreases; similarly, as the price of the product falls, the demand increases.” This is largely related to the opportunity cost of purchasing more expensive items, with the expectation that buyers will have to give up consuming what they value more to buy more expensive products, and they will probably want to buy less. Similarly, the law of supply is related to the quantity that will be sold at a particular price point. Essentially contrary to the law of demand, the supply model shows that the higher the price, the higher the quantity provided due to the increase of business income, depends on selling more products at a higher price. The relationship between supply and demand depends to a great extent on maintaining the balance between them, in which supply in the market will never be more or less than demand. Think of a new DVD for $15 in modern applications. Because market analysis has shown that current consumers will not spend too much on film prices, the company only issues 100 copies, because the opportunity cost of suppliers is too high for demand. However, if demand increases, prices will also increase, leading to an increase in supply. On the contrary, if 100 DVDs are issued and only 50 DVDs are needed, the price of the remaining 50 DVDs that are no longer needed in the attempt to sell the market will drop. The concepts inherent in the supply and demand model further support the discussion of modern economics, especially when they apply to capitalist society. Without a basic understanding of this model, it is almost impossible to understand the complex world of economic theory.
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