📚 Deflation and Disinflation | 通货紧缩与去通胀
In A-Level Economics, students often mix up deflation and disinflation. Deflation means a sustained fall in the general price level, so the inflation rate is negative. Disinflation means a fall in the inflation rate, but prices are still rising, just more slowly. Understanding this distinction is essential for essays on macroeconomic performance and policy.
在A-Level经济中，学生经常混淆通货紧缩与去通胀。通货紧缩指一般物价水平持续下降，因此通胀率为负。去通胀指通胀率下降，但物价仍在上涨，只是涨得更慢。理解这一区别对宏观经济表现和政策类论文至关重要。
1. Defining Inflation, Deflation and Disinflation | 定义通货膨胀、通货紧缩与去通胀
Inflation is a sustained increase in the general price level, usually measured by the Consumer Price Index (CPI). Deflation occurs when the inflation rate is negative, meaning average prices fall over a period. Disinflation describes a slowdown in the rate of inflation, for example from 5% to 2% per year.
通货膨胀是一般物价水平持续上升，通常用消费者物价指数(CPI)衡量。当通胀率为负时发生通货紧缩，意味着平均价格在一段时间内下降。去通胀描述通胀率放缓，例如从每年5%降到2%。
| Term | Price level | Inflation rate |
|---|---|---|
| Inflation | Rising | Positive |
| Deflation | Falling | Negative |
| Disinflation | Rising more slowly | Positive but falling |
A common exam error is to call any fall in the inflation rate “deflation”. Only when the inflation rate drops below zero does deflation begin.
一个常见的考试错误是把通胀率的任何下降都称为”通缩”。只有当通胀率降到零以下时，才开始出现通缩。
2. Measuring Price Level Changes | 衡量物价水平变动
The CPI tracks the price of a basket of goods and services bought by a typical household. The annual inflation rate is calculated using the formula:
CPI追踪典型家庭购买的一篮子商品和服务的价格。年通胀率通过以下公式计算：
Inflation rate = (CPIₜ − CPIₜ₋₁) ÷ CPIₜ₋₁ × 100
If CPI rises from 120 to 123, the inflation rate is (123 − 120) ÷ 120 × 100 = 2.5%. If CPI then rises from 123 to 125, the rate is about 1.6%: this is disinflation. If CPI falls from 125 to 123, the rate is −1.6%: this is deflation.
如果CPI从120升至123，通胀率为(123−120)÷120×100 = 2.5%。如果CPI随后从123升至125，通胀率约为1.6%，这就是去通胀。如果CPI从125降至123，通胀率为−1.6%，这就是通缩。
Price level and inflation rate are not the same. The price level can be high but falling, which would be deflation, not low inflation.
物价水平与通胀率不是一回事。物价水平可能很高但在下降，这属于通缩，而不是低通胀。
3. Demand-Side Causes of Deflation | 需求侧导致的通缩
Deflation is often caused by a persistent shortfall in aggregate demand (AD). If AD falls or grows very slowly, firms accumulate unsold stock and cut prices. A fall in household consumption due to high unemployment, falling wages or low confidence can trigger this.
通缩通常由总需求(AD)持续不足引起。如果AD下降或增长非常缓慢，企业库存积压并降价。高失业、工资下降或信心低迷导致家庭消费下降，可能引发这种局面。
Falling asset prices can also reduce household wealth and spending. For example, after a house price crash, homeowners feel poorer and cut back, putting further downward pressure on prices.
资产价格下跌也会减少家庭财富和支出。例如，房价崩盘后，房主感觉变穷并削减开支，从而进一步加大物价下行压力。
Monetary contraction, such as a severe credit crunch, restricts borrowing and spending, shifting AD left. The Great Depression is a classic example of demand-deficient deflation.
货币紧缩，例如严重的信贷紧缩，限制借贷和支出，使AD左移。大萧条是需求不足型通缩的典型例子。
4. Supply-Side Causes of Deflation | 供给侧导致的通缩
Deflation can also arise from positive supply shocks. Improvements in productivity, technological innovation, or falling input costs shift aggregate supply (AS) to the right, lowering the price level while increasing real output.
通缩也可能来自正面的供给冲击。生产率提高、技术进步或投入成本下降使总供给(AS)右移，降低物价水平并增加实际产出。
This type of deflation is sometimes called “good deflation” because it can accompany economic growth. For example, advances in computing and communications have reduced the prices of many electronic goods.
这种通缩有时被称为”良性通缩”，因为它可能伴随经济增长。例如，计算和通信技术的进步降低了许多电子产品的价格。
However, if global competition drives down wages and prices broadly, temporary supply-side deflation may turn into expectations of falling prices, which can be harmful.
但是，如果全球竞争广泛压低工资和物价，暂时性的供给侧通缩可能转变为价格下跌预期，从而带来危害。
5. Why Disinflation Occurs | 去通胀为何发生
Disinflation usually follows a period of tight monetary or fiscal policy. When a central bank raises interest rates, borrowing becomes more expensive, consumption and investment fall, and AD growth slows. Inflation then falls from a high rate to a lower positive rate.
去通胀通常出现在紧缩的货币或财政政策之后。当中央银行提高利率时，借贷成本上升，消费和投资下降，AD增长放缓。通胀率随后从高位降至较低的正值。
Falling commodity prices can also drive disinflation without causing deflation. For instance, a drop in oil prices reduces production costs and consumer energy bills, slowing inflation while the overall price level may still rise.
大宗商品价格下降也可能推动去通胀而不会引发通缩。例如，油价下跌降低生产成本和消费者能源支出，使通胀放缓，而整体物价水平可能仍在上涨。
Currency appreciation can cause disinflation by making imports cheaper. This lowers imported inflation and reduces the CPI, but the economy may still experience positive inflation.
货币升值通过使进口商品更便宜而导致去通胀。这降低了输入型通胀并压低CPI，但经济仍可能出现正通胀。
6. Costs of Deflation: Debt and Spending | 通缩的代价：债务与支出
Deflation increases the real value of debt. Since wages and prices fall, borrowers must repay loans with money that is worth more in real terms. This can raise default rates and harm banks.
通缩增加债务的实际价值。由于工资和价格下降，借款人必须用实际价值更高的货币偿还贷款。这可能提高违约率并损害银行。
Consumers and firms may postpone spending if they expect prices to fall further. This “wait and see” behaviour reduces current consumption and investment, shifting AD left and worsening deflation.
如果消费者和企业预期价格会进一步下跌，他们可能推迟支出。这种”观望”行为减少当前消费和投资，使AD左移并加剧通缩。
This creates a deflationary spiral: falling demand leads to lower prices, which leads to expectations of even lower prices, further falls in demand, and rising unemployment.
这会形成通缩螺旋：需求下降导致价格下跌，价格下跌又引发进一步降价预期，需求继续下降，失业上升。
7. Costs of Deflation: Unemployment and Growth | 通缩的代价：失业与增长
Because wages are sticky downwards, firms facing falling prices may not be able to cut nominal wages easily. Instead, they reduce output and lay off workers, causing unemployment to rise.
由于工资具有向下粘性，面对价格下跌的企业可能难以轻易削减名义工资。它们转而减少产量和解雇工人，导致失业上升。
Falling prices can also reduce business revenue and profits. If firms expect losses, they cancel investment projects, lowering potential growth and labour productivity in the long run.
价格下跌还会减少企业收入和利润。如果企业预期亏损，它们会取消投资项目，长期内降低潜在增长和劳动生产率。
Deflation can make monetary policy less effective. Nominal interest rates cannot fall much below zero, so when prices fall, the real interest rate may remain high even at the zero lower bound.
通缩使货币政策的效力减弱。名义利率很难降至零以下太多，因此
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