📚 How the Price Mechanism Works | 价格机制的运作原理
The price mechanism is the unseen coordinating force of a market economy. It is the process by which the prices of goods and services are determined by the interaction of demand and supply, and by which these prices in turn direct resources to their most efficient uses. In a free market, prices are not set by any person or institution; they emerge from the millions of independent choices made by consumers and producers. This article explains the operational principles of the price mechanism, covering its functions, the adjustment process, its efficiency and its limitations.
价格机制是市场经济中无形的协调力量。它是指商品和服务的价格通过需求与供给的相互作用而决定，进而指导资源实现最有效配置的过程。在自由市场中，价格并非由任何个人或机构设定，而是源于消费者和生产者数百万个独立选择的结果。本文阐释价格机制的运作原理，涵盖其功能、调整过程、效率与局限性。
1. The Dual Functions of Price: Signal and Incentive | 价格的双重功能：信号与激励
The price mechanism works through two complementary functions: signalling and incentivising. These together allow a decentralised system to coordinate economic activity without a central planner.
价格机制通过信号传递和激励诱导这两个互补功能发挥作用。二者共同使一个分散化的系统能够在没有中央计划者的情况下协调经济活动。
Price as a signal: A price carries information about the relative scarcity of a good. A rising price tells consumers that the good is scarcer relative to demand, and tells producers that there is an opportunity to earn higher profits. A falling price signals abundance and reduced profitability.
价格作为信号：价格传递关于商品相对稀缺性的信息。价格上涨告诉消费者该商品相对于需求更为稀缺，同时告诉生产者存在获得更高利润的机会。价格下跌则表明供给充裕、盈利下降。
Price as an incentive: Prices motivate agents to alter their behaviour. Higher prices encourage producers to increase supply and consumers to reduce quantity demanded; lower prices produce the opposite response. This incentive structure channels resources toward uses where consumer valuation is highest.
价格作为激励：价格促使经济主体改变行为。较高的价格鼓励生产者增加供给，促使消费者减少需求量；较低的价格则引发相反的反应。这种激励结构引导资源流向消费者评价最高的用途。
2. The Price Mechanism and the Basic Economic Problem | 价格机制与基本经济问题
Every society faces the fundamental problem of scarce resources and unlimited wants. The price mechanism answers the three basic questions of resource allocation without conscious direction.
每个社会都面临资源稀缺与欲望无穷的基本矛盾。价格机制在没有有意识指令的情况下，回答了资源配置的三个基本问题。
What to produce? Consumers 'vote' with their spending. Goods that are demanded strongly command high prices and generate profits, so producers are induced to supply them. Unprofitable goods are produced less.
生产什么？消费者用支出进行'投票'。需求强劲的商品价格高、利润大，生产者因而被诱导去供给这些商品。无利可图的商品则被减少生产。
How to produce? Competition forces producers to use the most efficient methods. Firms that adopt lower-cost technologies can charge lower prices and gain market share.
如何生产？竞争迫使生产者采用最有效的方法。采用低成本技术的企业能够降低价格并赢得市场份额。
For whom to produce? Output goes to those who are willing and able to pay the market price. Consumers with greater purchasing power command a larger share of goods and services.
为谁生产？产品流向那些愿意并有能力支付市场价格的人。购买力更强的消费者能够获得更大份额的商品和服务。
3. Market Equilibrium and the Adjustment Process | 市场均衡与调整过程
The price mechanism is a dynamic process that continually moves the market toward equilibrium. Equilibrium occurs where quantity demanded equals quantity supplied.
价格机制是一个动态过程，不断推动市场趋向均衡。均衡出现在需求量等于供给量之处。
Qd = Qs
If the price is above the equilibrium level, quantity supplied exceeds quantity demanded, creating an excess supply (surplus). Producers are left with unsold stocks and cut prices. As the price falls, quantity supplied falls and quantity demanded rises until the surplus is eliminated.
如果价格高于均衡水平，供给量超过需求量，形成超额供给（过剩）。生产者面临库存积压，于是降低价格。随着价格下跌，供给量减少，需求量增加，直到过剩被消除。
Conversely, if the price is below equilibrium, quantity demanded exceeds quantity supplied, creating an excess demand (shortage). Competition among consumers pushes the price upward, which simultaneously discourages demand and encourages supply, restoring equilibrium.
反之，如果价格低于均衡，需求量超过供给量，形成超额需求（短缺）。消费者之间的竞争推动价格上升，价格上升一方面抑制需求，另一方面鼓励供给，从而恢复均衡。
4. Demand Shifts and the Price Mechanism | 需求变动与价格机制
The price mechanism also copes with shifts in demand. When a non-price determinant of demand changes, the entire demand curve moves, and the price mechanism re-establishes equilibrium at a new price and quantity.
价格机制还能应对需求的变动。当需求的非价格决定因素变化时，整条需求曲线移动，价格机制在新的价格和数量上重新建立均衡。
For example, if incomes rise, the demand for normal goods increases at every price. The initial equilibrium price is now too low: a shortage appears. The upward pressure on price signals producers to expand output. The market settles at a higher price and a higher quantity traded.
例如，如果收入增加，正常商品在每一价格下的需求都会增加。初始均衡价格现在过低：出现短缺。上升的价格压力向生产者发出扩大产出的信号。市场最终在更高的价格和
Published by TutorHao | A-Level Economics Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图