📚 Money: Its Functions and Characteristics | 货币：功能与特征
Money is any asset that is widely accepted as payment for goods and services or for the settlement of debts. In a modern economy, money is not valued mainly for its own sake but for what it can buy and for the confidence people have in its future purchasing power.
货币是指被广泛接受用于购买商品和服务或用于清偿债务的任何资产。在现代经济中，人们持有货币主要不是因为货币本身有价值，而是因为它能买到什么，以及人们对它未来购买力的信心。
This topic is central to Cambridge A-Level Economics because it links the basic functions of money to the features that allow money to perform those functions well. A clear distinction between functions and characteristics is essential for exam answers.
这一主题是剑桥 A-Level 经济学的核心内容，因为它将货币的基本功能与使货币能够良好发挥功能所需的特征联系起来。在考试答案中，清楚区分功能与特征至关重要。
1. Defining money and its economic role | 定义货币及其经济作用
In economics, money is defined by its functions rather than by its physical form. It can be notes and coins, but it also includes bank deposits and digital balances that people are willing to accept in exchange.
在经济学中，货币是由其功能而不是由其实物形式来定义的。它可以是纸币和硬币，但也包括人们愿意在交换中接受的银行存款和数字余额。
The essential feature of money is that it acts as a generally accepted medium of exchange. Without this acceptance, an asset may have value, but it is not functioning as money in the everyday sense.
货币的本质特征是它充当了一种被普遍接受的交换媒介。如果没有这种接受性，一种资产可能有价值，但在日常意义上它并没有发挥货币的作用。
Money lowers transaction costs compared with barter. Trade under barter requires a double coincidence of wants, which makes transactions slow and costly for both buyers and sellers.
与物物交换相比，货币降低了交易成本。在物物交换制度下，交易要求需求的双重巧合，这使得买卖双方的交易既缓慢又成本高昂。
2. Function 1: Medium of exchange | 功能一：交换媒介
The primary function of money is to serve as a medium of exchange. Sellers accept money because they know they can use it later to buy other goods and services from different people.
货币的首要功能是充当交换媒介。卖方接受货币，是因为他们知道以后可以用它向不同的人购买其他商品和服务。
This function removes the need for barter. A teacher can sell labour for money and then use that money to buy food, clothing and transport without finding a farmer, tailor and driver who each want a lesson at the same time.
这一功能消除了对物物交换的需要。教师可以用劳动换取货币，然后用货币购买食物、衣服和交通服务，而不必同时找到分别想要上课的农民、裁缝和司机。
As a medium of exchange, money must be easily transferable from one person to another. This is why digital payments and bank transfers are now widely used alongside physical cash in modern economies.
作为交换媒介，货币必须易于在人与人之间转移。这就是为什么在现代经济中，数字支付和银行转账与实物现金一起被广泛使用。
3. Function 2: Unit of account | 功能二：记账单位
Money provides a common measure of value in which prices are quoted. Consumers can compare the value of different goods because prices are expressed in the same monetary unit, such as pounds or dollars.
货币提供了一种共同的价值尺度，价格以这种尺度标出。消费者可以比较不同商品的价值，因为价格都以同一货币单位表示，例如英镑或美元。
Without a unit of account, a barter economy with many goods would require a very large number of bilateral exchange ratios. A monetary unit reduces these to a single set of money prices, which lowers information costs for buyers and sellers.
如果没有记账单位，在一种拥有许多商品的物物交换经济中，就需要大量双边交换比率。货币单位将这些比率简化为单一的一套货币价格，从而降低了买卖双方的信息成本。
Firms also use money as a unit of account when preparing financial statements, calculating profits and setting budgets. This function is important even for assets that are not themselves used as cash in daily transactions.
企业在编制财务报表、计算利润和制定预算时，也使用货币作为记账单位。即使某些资产本身并不在日常交易中充当现金，这一功能仍然很重要。
4. Function 3: Store of value | 功能三：价值储藏
Money can be held over time and used for future purchases. To perform this role, money must retain at least a reasonable share of its purchasing power between the time it is received and the time it is spent.
货币可以被持有并在未来用于购买。要发挥这一作用，货币必须在获得和支出之间至少保持合理份额的购买力。
Under high inflation, money becomes a poor store of value because its real purchasing power falls quickly. People may then switch into foreign currency, real assets such as property, or indexed financial assets to protect their wealth.
在高通胀下，货币会成为糟糕的价值储藏手段，因为它的实际购买力迅速下降。人们可能会转向外币、房地产等实物资产或指数化金融资产，以保护自己的财富。
Deflation can make money gain value over time, but it also discourages spending and can harm economic activity. For this reason, central banks generally aim for low and stable inflation rather than a falling price level.
通缩会使货币在一段时间内升值，但它也会抑制支出并损害经济活动。因此，中央银行通常以低而稳定的通胀为目标，而不是让物价水平持续下降。
5. Function 4: Standard of deferred payment | 功能四：延期支付标准
Many contracts, loans and wage agreements are written in money terms. Money therefore acts as a standard for future payments, allowing debts to be recorded and settled in a known unit of account.
许多合同、贷款和工资协议都以货币形式订立。因此，货币充当未来支付的标准，使债务能够以已知的记账单位记录和清偿。
For deferred payment to work well, the value of money must be reasonably predictable. Unexpected inflation redistributes real wealth from creditors to debtors, while unexpected deflation does the opposite.
要使延期支付有效运行，货币的价值必须相当可预测。未预期的通胀会将实际财富从债权人再分配给债务人，而未预期的通缩则相反。
If money is an unreliable standard of deferred payment, lenders will demand higher interest rates or avoid long-term lending altogether. This can reduce investment and slow economic growth.
如果货币是不可靠的延期支付标准，贷款人就会要求更高的利率，或者完全避免长期贷款。这会减少投资并拖慢经济增长。
6. Characteristic 1: Durability | 特征一：耐用性
A good form of money must be durable, meaning it does not spoil, rot or wear out quickly. Coins and polymer banknotes last a long time, whereas perishable goods such as fish or fruit would be very poor money.
一种良好的货币形态必须耐用，即不会迅速腐烂、变质或磨损。硬币和聚合物纸币可以使用很长时间，而鱼、水果等易腐商品则不适合充当货币。
Durability allows money to be stored and carried without losing its physical usefulness. If money deteriorated quickly, sellers would be less willing to accept it and transaction costs would rise sharply.
耐用性使货币能够被储存和携带而不丧失其实物用途。如果货币很快损坏，卖方就不太愿意接受它，交易成本也会大幅上升。
Historically, commodities such as salt, cattle and grain had some monetary uses, but they were limited by durability problems. Precious metals such as gold and silver became popular partly because they do not corrode or decay easily.
历史上，盐、牛和谷物等商品曾具有某些货币用途，但它们受到耐用性问题的限制。黄金和白银等贵金属之所以流行，部分原因是它们不易腐蚀或变质。
7. Characteristic 2: Portability | 特征二：便携性
Money must be easy to carry and transfer in useful amounts. Modern notes, coins and especially digital money score highly on portability because large values can be moved with low weight and low cost.
货币必须便于携带和转移有用的数量。现代纸币、硬币尤其是数字货币在便携性上得分很高，因为大额价值可以以很低的重量和成本转移。
Portability makes exchange efficient over large distances. If money were heavy or bulky, trade would be limited and some transactions would become impractical or impossible.
便携性使远距离交换变得高效。如果货币沉重或体积庞大，贸易将受到限制，一些交易将变得不切实际或无法进行。
Digital balances have increased portability further because transfers can be made instantly through banking systems and mobile payment platforms, without needing to move physical cash at all.
数字余额进一步提高了便携性，因为通过银行系统和移动支付平台可以即时完成转账，根本不需要转移实物现金。
8. Characteristic 3: Divisibility | 特征三：可分割性
Money must be divisible into smaller units without losing value proportionally. This allows prices to be set precisely and enables purchases of both low-value and high-value goods and services.
货币必须可以分割成更小的单位，而价值不会按比例损失。这使得价格可以精确设定，并能够购买低价值和高价值的商品与服务。
A cow, for example, is not easily divisible for small transactions. Modern currency systems use decimal units, such as pounds and pence, to make exact payment simple for buyers and sellers.
例如，一头牛不容易分割用于小额交易。现代货币体系使用十进制单位，如英镑和便士，使买卖双方能够简单地进行精确支付。
Divisibility also supports the unit of account function. If money could not be divided into small units, many goods would have to be priced in awkward fractions, increasing the cost of comparing and recording transactions.
可分割性还支持记账单位功能。如果货币不能分割成小单位，许多商品就不得不以不便的分数标价，从而增加比较和记录交易的成本。
9. Characteristic 4: Uniformity and fungibility | 特征四：同质性与可替代性
Each unit of money must be identical in quality and value. One £10 note is interchangeable with another £10 note of the same issue, which is the property of fungibility.
每一单位货币在质量和价值上必须相同。一张10英镑纸币与同版另一张10英镑纸币可以互换，这就是可替代性。
Uniformity builds confidence because people do not need to inspect each unit carefully. If money units varied in quality, pricing and exchange would become uncertain, slow and costly.
同质性建立了信心，因为人们不必仔细检查每一单位货币。如果货币单位质量不一，定价和交换将变得不确定、缓慢且成本高昂。
For commodity money, uniformity can be a problem. For example, diamonds vary widely in size, cut, colour and clarity, which makes it hard to use them as a standard means of payment in ordinary transactions.
对于商品货币而言，同质性可能是一个问题。例如，钻石在大小、切工、颜色和净度上差异很大，因此很难在日常交易中用作标准支付手段。
10. Characteristic 5: Limited supply and scarcity | 特征五：供应有限与稀缺性
For money to retain value, its supply must be limited. If anyone could create unlimited amounts of money at zero cost, its purchasing power would collapse through rapid inflation.
货币要保持价值，其供应必须有限。如果任何人都可以零成本无限量制造货币，其购买力将通过快速通胀而崩溃。
Central banks therefore control the growth of the money supply as part of monetary policy. Historical examples of over-issuing paper money, such as hyperinflation in Zimbabwe or Weimar Germany, show how quickly confidence can disappear.
因此，中央银行作为货币政策的一部分控制货币供应量的增长。历史上纸币超发的事例，如津巴布韦或魏玛德国的恶性通胀，表明信心能有多快地消失。
Scarcity does not mean the money supply can never grow. In a growing economy, some increase in the money stock is usually needed, but the growth must be controlled and consistent with price stability.
稀缺并不意味着货币供应量永远不能增长。在经济增长中，通常需要一定程度增加货币存量，但这种增长必须受到控制，并与物价稳定相一致。
11. Characteristic 6: Acceptability and stability of value | 特征六：可接受性与价值稳定
Money must be widely accepted within an economy. Legal tender laws and public confidence in the issuer help to ensure that money is accepted in shops, for debt repayment and in tax payments.
货币必须在经济中被广泛接受。法定货币法律和公众对发行者的信心有助于确保货币在商店、债务偿还和税收支付中被接受。
Stability of value supports all four functions of money. If the general price level changes violently, money becomes a weaker medium of exchange, unit of account, store of value and standard of deferred payment at the same time.
价值稳定支撑着货币的全部四项功能。如果总体物价水平剧烈变动，货币就会同时成为较弱的交换媒介、记账单位、价值储藏和延期支付标准。
Some cryptocurrencies are not yet widely accepted or stable enough to serve all functions well, so they are often treated as speculative assets rather than core money. Their price volatility weakens their role as a unit of account and store of value.
一些加密货币尚未被广泛接受，或不够稳定，无法很好地履行所有功能，因此它们通常被视为投机性资产，而不是核心货币。其价格波动削弱了它们作为记账单位和价值储藏的作用。
12. Conclusion: Functions and characteristics reinforce each other | 结论：功能与特征相互强化
The functions of money depend on its characteristics. A commodity or asset cannot be a reliable medium of exchange unless it is durable, portable, divisible, uniform and limited in supply.
货币的功能取决于其特征。一种商品或资产如果不能耐用、便携、可分割、同质且供应有限，就无法成为可靠的交换媒介。
However, the link also runs the other way: because money performs these functions, people are willing to accept it, which strengthens its acceptability. This two-way relationship explains why modern fiat money, with no intrinsic value, can still operate effectively.
然而，这种联系也反向成立：正因为货币履行这些功能，人们才愿意接受它，这又增强了它的可接受性。这种双向关系解释了为什么现代法定货币虽然没有内在价值，却仍然能够有效运行。
In exam answers, it is important to define money by its functions first, then explain how each characteristic supports those functions, using real-world examples such as barter costs, inflation or historical hyperinflation.
在考试答案中，重要的是先按功能定义货币，然后解释每项特征如何支持这些功能，并结合物物交换成本、通货膨胀或历史上的恶性通胀等现实例子进行说明。
Published by TutorHao | Economics Revision Series | aleveler.com
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