📚 Inflation and Deflation | 通货膨胀与通货紧缩
Inflation and deflation are two of the most important macroeconomic concepts you will encounter in the Cambridge IGCSE Economics syllabus. Inflation refers to a sustained rise in the general price level, which reduces the purchasing power of money. Deflation, on the contrary, is a sustained fall in the general price level. Both can destabilise an economy and affect consumers, firms and the government in profound ways. This article explains how inflation and deflation are measured, what causes them, their consequences and the policies used to control them.
通货膨胀和通货紧缩是你在剑桥 IGCSE 经济学大纲中会遇到的两个最重要的宏观经济概念。通货膨胀指的是总体价格水平的持续上升，这会降低货币的购买力。相反，通货紧缩则是总体价格水平的持续下降。两者都可能破坏经济稳定，并对消费者、企业和政府产生深远影响。本文将解释如何衡量通货膨胀和通货紧缩，其成因、后果以及用于控制它们的政策。
1. What is Inflation? | 什么是通货膨胀？
Inflation is defined as a persistent increase in the average price level of goods and services in an economy. It is usually expressed as an annual percentage change. A moderate rate of inflation, such as 2% per year, is often considered normal and can even be beneficial for a growing economy. However, very high inflation or hyperinflation can destroy savings, create uncertainty and lead to economic collapse. Famous historical examples include Germany in 1923 and Zimbabwe in the late 2000s.
通货膨胀被定义为经济中商品和服务平均价格水平的持续上涨。它通常以年度百分比变化来表示。温和的通胀率，例如每年 2%，通常被认为是正常的，甚至对增长中的经济有利。然而，极高的通胀或恶性通胀会摧毁储蓄、制造不确定性并导致经济崩溃。著名的历史例子包括 1923 年的德国和 2000 年代后期的津巴布韦。
2. Measuring Inflation: The Consumer Price Index | 测量通货膨胀：消费者价格指数
Most economies measure inflation using the Consumer Price Index (CPI). The CPI tracks the cost of a representative basket of goods and services that a typical household buys. The basket includes categories such as food, housing, transport, healthcare and education. A base year is selected and given an index value of 100. The percentage change in the CPI from one period to another indicates the rate of inflation.
大多数经济体使用消费者价格指数 (CPI) 来测量通货膨胀。CPI 追踪一个典型家庭所购买的一篮子代表性商品和服务的成本。篮子中包括食品、住房、交通、医疗和教育等类别。选定一个基年并赋予其指数值 100。CPI 从一个时期到另一个时期的百分比变化反映了通货膨胀率。
| CPI Category | Typical Weight (%) |
|---|---|
| Food and non-alcoholic beverages | 15 |
| Housing and utilities | 25 |
| Transport | 15 |
| Healthcare | 8 |
| Education and recreation | 12 |
| Other goods and services | 25 |
Table: An illustrative CPI basket. Actual weights vary between countries.
表格：一个示例性的 CPI 篮子。实际权重因国家而异。
3. Causes of Inflation: Demand-Pull | 通货膨胀的原因：需求拉动
Demand-pull inflation occurs when aggregate demand (AD) increases faster than the economy’s ability to produce goods and services (aggregate supply, AS). This often happens when the economy is near full employment. With output unable to rise quickly, excess demand bids up prices. Common causes of demand-pull inflation include cuts in interest rates, tax reductions, rising consumer confidence, an increase in government spending and a boom in exports.
当总需求 (AD) 的增长快于经济生产商品和服务的能力（总供给，AS）时，就会发生需求拉动型通货膨胀。这通常发生在经济接近充分就业时。由于产出无法快速增加，超额需求会推高价格。需求拉动型通货膨胀的常见原因包括降低利率、减税、消费者信心上升、政府支出增加以及出口繁荣。
4. Causes of Inflation: Cost-Push | 通货膨胀的原因：成本推动
Cost-push inflation is driven by rising production costs that force firms to raise prices to maintain profit margins. Key cost increases can come from higher wages, more expensive raw materials (such as oil and food), increases in indirect taxes or a depreciation of the domestic currency that makes imported inputs pricier. Higher costs shift the short-run aggregate supply curve to the left, resulting in a higher price level and lower real output.
成本推动型通货膨胀是由上升的生产成本驱动的，这迫使企业提高价格以维持利润空间。关键成本的增加可能来自更高的工资、更贵的原材料（如石油和食品）、间接税的增加或本币贬值导致进口投入品更贵。成本上升会使短期总供给曲线向左移动，导致价格水平上升和实际产出下降。
5. The Quantity Theory of Money | 货币数量论
The Quantity Theory of Money offers a classical explanation of inflation. It is summarised by the equation of exchange:
货币数量论提供了通货膨胀的古典解释。它由交易方程式概括：
M × V = P × Y
Where M is the money supply, V is the velocity of circulation, P is the average price level and Y is real output. If V and Y are relatively stable in the short run, an increase in M leads to a proportional rise in P. In other words, if a central bank prints too much money, inflation is likely to follow.
其中 M 是货币供给，V 是流通速度，P 是平均价格水平，Y 是实际产出。如果 V 和 Y 在短期内相对稳定，那么 M 的增加会导致 P 成比例上升。换句话说，如果中央银行印了太多的钱，就很可能会发生通货膨胀。
6. Consequences of Inflation | 通货膨胀的后果
High and unpredictable inflation can have several damaging effects on an economy:
高且不可预测的通货膨胀会对经济产生若干破坏性影响：
Shoe leather costs: People hold less cash and make more trips to the bank to avoid the erosion of purchasing power, wasting time and effort.
鞋底成本：人们减少现金持有量，更频繁地往返银行以避免购买力侵蚀，从而浪费时间和精力。
Menu costs: Firms face expenses from constantly updating prices, such as reprinting menus, catalogues and price tags, or reprogramming electronic systems.
菜单成本：企业因不断更新价格而产生费用，例如重印菜单、目录和价签，或重新编程电子系统。
Redistribution of income: Inflation hurts savers and people on fixed nominal incomes, like pensioners, because the real value of their money falls. Borrowers, however, may gain if the real value of their debt decreases.
收入再分配：通货膨胀损害储蓄者和固定名义收入者，如养老金领取者，因为他们资金的实际价值下降。然而，借款人可能因债务实际价值下降而获益。
Uncertainty and reduced investment: When firms cannot predict future prices and costs, they are less likely to invest, which slows long-term economic growth.
不确定性和投资减少：当企业无法预测未来价格和成本时，它们不太可能进行投资，从而减缓长期经济增长。
Loss of international competitiveness: If domestic inflation exceeds that of trading partners, exports become relatively more expensive and imports cheaper, worsening the trade balance.
国际竞争力丧失：如果国内通胀率超过贸易伙伴，出口商品会相对更贵，进口商品更便宜，从而恶化贸易收支。
7. What is Deflation? | 什么是通货紧缩？
Deflation is a sustained decrease in the general price level. At first glance, falling prices might appear beneficial for consumers, but deflation is often associated with economic recession. When prices consistently fall, people may delay purchases, aggregate demand drops, and firms cut production and jobs. Additionally, the real value of debt rises, making it harder for borrowers to repay loans and increasing the risk of bankruptcies.
通货紧缩是总体价格水平的持续下降。乍看之下，价格下跌可能对消费者有利，但通货紧缩常常伴随着经济衰退。当价格持续下跌时，人们可能会推迟购买，总需求下降，企业削减产量和就业。此外，债务的实际价值上升，使借款人更难偿还贷款，并增加破产风险。
8. The Deflationary Spiral | 通货紧缩螺旋
A key danger of deflation is the deflationary spiral. Falling prices lead consumers to expect even lower prices in the future, so they postpone spending. This lowers aggregate demand further, pushing firms to reduce output and lay off workers. Unemployment rises, household incomes fall, and spending falls again. The economy can become trapped in a cycle of declining demand and prices. Japan’s experience in the 1990s and 2000s, often called the “Lost
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