📚 IGCSE OCR Economics: Fiscal Policy Revision Guide | 财政政策考点精讲
Fiscal policy involves the use of government spending and taxation to influence the level of economic activity. It is one of the main macroeconomic policies, alongside monetary policy, that governments use to achieve objectives such as steady economic growth, low unemployment, and price stability. For IGCSE OCR Economics, you need to understand how fiscal policy works, the different types of taxes and spending, and how it affects aggregate demand.
财政政策是指政府运用支出和税收来影响经济活动水平。与货币政策一样，它是政府用来实现稳定经济增长、低失业率和物价稳定等目标的主要宏观经济政策之一。在IGCSE OCR经济学中，你需要理解财政政策的运作方式、不同类型的税收和支出，以及它如何影响总需求。
1. What is Fiscal Policy? | 什么是财政政策？
Fiscal policy refers to the decisions made by a government regarding its level of spending and the rates of taxation. It is set annually through the government’s budget. Changes in fiscal policy directly influence aggregate demand (AD) because government spending (G) is a component of AD, and taxation (T) affects household disposable income and business investment.
财政政策指政府就支出水平和税率作出的决策。它通过政府年度预算来制定。财政政策的变动直接影响总需求（AD），因为政府支出（G）是总需求的组成部分，而税收（T）影响家庭可支配收入和企业投资。
Fiscal policy can be used to stimulate a sluggish economy (expansionary) or to cool down an overheating one (contractionary). The core equation for aggregate demand reminds us why:
财政政策可用于刺激疲软的经济（扩张性）或为过热的经济降温（紧缩性）。总需求的基本方程提醒我们原因：
AD = C + I + G + (X − M)
2. Government Budget: Revenue and Expenditure | 政府预算：收入与支出
The government budget shows planned revenue from taxes and other sources, and planned expenditure on goods, services, and transfers. A budget surplus occurs when tax revenue exceeds government spending; a budget deficit when spending exceeds revenue; and a balanced budget when the two are equal.
政府预算列明了来自税收和其他来源的计划收入，以及计划用于商品、服务和转移支付的支出。当税收收入超过政府支出时，出现预算盈余；当支出超过收入时，出现预算赤字；二者相等时则为平衡预算。
The budget balance is a key indicator of the stance of fiscal policy. A persistent deficit adds to the national debt, while a surplus can be used to repay debt or save for future downturns.
预算余额是财政政策立场的重要指标。持续的赤字会增加国债，而盈余可用于偿还债务或为未来的经济下行期储蓄。
3. Types of Taxation | 税收类型
Taxes can be classified as direct or indirect. Direct taxes are levied on income and wealth (e.g., income tax, corporation tax), while indirect taxes are levied on spending (e.g., value-added tax, excise duties). The design of a tax system also determines whether taxes are progressive, proportional, or regressive.
税收可分为直接税和间接税。直接税对收入和财富征收（如所得税、公司税），间接税对支出征收（如增值税、消费税）。税制的设计也决定了税收是累进、比例还是累退的。
| Tax Type | Description | Example |
|---|---|---|
| Direct tax | Levied on income/wealth | Income tax, corporation tax |
| Indirect tax | Levied on spending | VAT, excise duty |
| Progressive | Rate rises as income rises | UK income tax |
| Proportional | Same rate for all incomes | Flat tax (e.g., 15%) |
| Regressive | Takes a larger % from low incomes | Cigarette excise |
A progressive tax takes a growing share of income as earnings rise, helping to redistribute income. A proportional tax takes the same share, while a regressive tax places a heavier relative burden on the poor. Indirect taxes are often regressive because lower-income households spend a larger share of their income on taxed goods.
累进税随着收入上升而取走越来越大的收入份额，有助于再分配收入。比例税取走相同份额，而累退税则给穷人带来更重的相对负担。间接税通常具有累退性，因为较低收入家庭在应税商品上的支出占其收入的比重更大。
4. Government Spending | 政府支出
Government spending falls into three main categories: current spending (recurring items such as public sector wages and healthcare), capital spending (investment in infrastructure like roads, schools, and hospitals), and transfer payments (benefits and pensions that move money from taxpayers to recipients without a direct output).
政府支出可分为三大类：经常性支出（如公共部门工资和医疗保健等经常性项目）、资本性支出（如道路、学校和医院等基础设施投资）和转移支付（将纳税人资金转移给受益人的福利和养老金，不直接产生产出）。
Transfer payments are not counted directly in GDP, but they boost disposable income and therefore support consumption. Capital spending not only increases AD in the short run but can also shift aggregate supply outward in the long run by improving productivity.
转移支付不直接计入GDP，但能提高可支配收入，从而支撑消费。资本性支出不仅在短期内增加总需求，还能通过提高生产率在长期内使总供给曲线向外移动。
5. Expansionary Fiscal Policy | 扩张性财政政策
An expansionary (or reflationary) fiscal policy aims to boost aggregate demand and increase economic growth. It involves raising government spending and/or cutting taxes. This puts more money into the circular flow, encouraging consumption and investment.
扩张性（或刺激性的）财政政策旨在提升总需求并促进经济增长。它包括提高政府支出和/或减税，从而向经济循环注入更多资金，鼓励消费和投资。
As a result, the AD curve shifts to the right, from AD₁ to AD₂, leading to higher real GDP (Y₁ to Y₂) and possibly a higher price level (P₁ to P₂). The initial increase in spending can trigger a multiplier effect, making the final boost to GDP larger than the original injection.
结果是总需求曲线向右移动，从AD₁移至AD₂，导致实际GDP提高（Y₁到Y₂）并可能推高物价水平（P₁到P₂）。最初的支出增加会引发乘数效应，使得最终GDP的增长大于最初的注入。
Multiplier k = 1 ÷ (1 − MPC) = 1 ÷ MPS
This policy is typically used during a recession or when unemployment is high. However, if the economy is close to full capacity, expansionary fiscal policy may mainly raise prices rather than output.
这一政策通常在衰退或失业率高企时使用。然而，如果经济接近满负荷，扩张性财政政策可能主要推高价格而非产出。
6. Contractionary Fiscal Policy | 紧缩性财政政策
Contractionary (or deflationary) fiscal policy is designed to reduce aggregate demand to control inflation and to shrink a large budget deficit. It involves cutting government spending and/or raising taxes. This reduces disposable income and dampens consumer spending and business investment.
紧缩性（或收缩性的）财政政策旨在减少总需求，以控制通胀并缩小巨额预算赤字。它包括削减政府支出和/或增税。这降低了可支配收入，抑制了消费者支出和企业投资。
The AD curve shifts leftwards, from AD₁ to AD₂, bringing down the price level but possibly raising unemployment and reducing economic growth. Governments use contractionary policies when demand-pull inflation becomes a significant concern.
总需求曲线向左移动，从AD₁移至AD₂，降低了物价水平，但可能会提高失业率并减缓经济增长。当需求拉动型通胀成为重大关切时，政府会采用紧缩政策。
Contractionary fiscal policy can also restore confidence in public finances by curbing the deficit, which may keep interest rates lower over the medium term.
紧缩性财政政策还能通过抑制赤字来恢复对公共财政的信心，这可能在中期内维持较低利率。
7. Automatic Stabilisers | 自动稳定器
Automatic stabilisers are features of the fiscal system that reduce the amplitude of business cycle fluctuations without any deliberate policy change. They work by automatically adjusting tax revenues and government spending in response to changes in economic activity.
自动稳定器是财政体系中的一些机制，无需任何刻意政策变动即可减小商业周期的波动幅度。它们通过自动调整税收收入和政府支出，以应对经济活动变化。
The main automatic stabilisers are progressive taxes and unemployment benefits. In a boom, rising incomes push people into higher tax brackets and fewer individuals claim benefits, automatically withdrawing demand from the economy. In a recession, tax revenues fall and benefit payments rise, injecting demand. This moderates both expansions and contractions.
主要的自动稳定器是累进税和失业救济金。在经济繁荣期，收入上升使人们进入更高的税收等级，且领取救济金人数减少
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