📚 IGCSE Economics: Fiscal Policy Key Points | IGCSE 经济：财政政策 考点精讲
Fiscal policy is a crucial macroeconomic tool used by governments to influence economic activity. It involves changes in government spending and taxation to achieve objectives such as economic growth, low unemployment and stable prices. Understanding fiscal policy is essential for IGCSE Economics students as it links government actions to aggregate demand and the overall economy.
财政政策是政府用来影响经济活动的重要宏观经济工具。它通过改变政府支出和税收来实现经济增长、低失业率和价格稳定等目标。理解财政政策对IGCSE 经济学生至关重要，因为它将政府行为与总需求和整体经济联系起来。
1. What is Fiscal Policy? | 什么是财政政策？
Fiscal policy refers to the use of government revenue collection (mainly taxes) and expenditure (spending) to influence the economy. It is conducted through the annual government budget, which outlines planned spending and revenue for the upcoming year.
财政政策是指运用政府收入（主要是税收）和支出（支出）来影响经济。它通过年度政府预算来执行，预算概述了下一年的计划支出和收入。
As a demand-side policy, fiscal policy directly affects aggregate demand (AD). The AD equation is:
AD = C + I + G + (X − M)
作为一种需求方政策，财政政策直接影响总需求（AD）。总需求方程为：AD = C + I + G + (X − M)。
Changes in government spending (G) and taxation (which affects consumption C and investment I) shift the AD curve, impacting real GDP and the price level. The government can use expansionary or contractionary measures depending on the state of the economy.
政府支出（G）和税收（通过影响消费C和投资I）的变化会导致总需求曲线移动，进而影响实际GDP和价格水平。政府可根据经济状况采取扩张性或紧缩性措施。
2. Government Revenue: Taxes and Non-Tax Sources | 政府收入：税收与非税收入
Taxes are compulsory payments to the government, forming the bulk of its revenue. They can be classified as direct taxes (on income and wealth) and indirect taxes (on spending).
税收是向政府缴纳的强制性款项，构成其收入的大部分。可分为直接税（对收入和财富征收）和间接税（对支出征收）。
Examples of direct taxes include income tax, corporation tax and capital gains tax. Indirect taxes include value-added tax (VAT), excise duties on alcohol and tobacco, and customs tariffs.
直接税的例子包括所得税、公司税和资本利得税。间接税的例子包括增值税（VAT）、对烟酒征收的消费税以及关税。
Non-tax revenues come from fees for public services, fines, charges for licences and profits from state-owned enterprises. These are smaller but still contribute to government funds.
非税收入来自公共服务收费、罚款、许可证费以及国有企业利润。这些收入规模较小，但仍为政府资金做出贡献。
3. Classification of Taxes | 税收分类
Taxes are mainly classified as either direct or indirect. The table below summarises the key differences.
税收主要分为直接税和间接税。下表总结了主要区别。
| Direct Tax | Indirect Tax |
|---|---|
| Levied on income and wealth (e.g. income tax, corporation tax) | Levied on spending (e.g. VAT, excise duty) |
| Burden cannot be shifted to others | Burden can be shifted to consumers via higher prices |
| Often progressive (tax rate rises with income) | Often regressive (takes a larger % of income from the poor) |
Direct taxes are generally more equitable as they relate to ability to pay, but may discourage work and investment. Indirect taxes are easier and cheaper to collect and can discourage harmful consumption, but they tend to be regressive.
直接税通常更公平，因为它们与支付能力挂钩，但可能抑制工作和投资。间接税征收更容易、成本更低，并可抑制有害消费，但往往具有累退性。
4. Progressive, Regressive and Proportional Taxes | 累进税、累退税和比例税
A progressive tax takes a higher percentage of income as income rises. For example, an income tax with increasing marginal bands: the average tax rate increases with income.
累进税随收入增加而征收更高比例的税。例如，边际税率递增的所得税：平均税率随收入上升。
A regressive tax takes a larger proportion of income from low-income earners than from high-income earners. Example: a fixed-rate VAT on necessities, because low-income households spend a greater share of their income.
累退税从低收入者收入中提取的比例高于高收入者。例如：对必需品征收的固定税率增值税，因为低收入家庭支出的收入份额更大。
A proportional tax (flat tax) takes the same percentage of income regardless of income level. Few real-world taxes are truly proportional over all income levels.
比例税（统一税）无论收入水平如何，征收相同比例的税。现实世界中很少有税种在所有收入水平上都是真正比例的。
Key measures: average tax rate = total tax ÷ total income; marginal tax rate = tax rate on the next unit of income earned.
关键衡量指标：平均税率 = 总税额 ÷ 总收入；边际税率 = 对下一单位收入征收的税率。
5. Government Expenditure | 政府支出
Government spending is divided into current expenditure (day-to-day running costs such as salaries, supplies), capital expenditure (investment in infrastructure, schools, hospitals) and transfer payments (pensions, unemployment benefits).
政府支出分为经常性支出（日常运营成本，如工资、物资）、资本性支出（对基础设施、学校、医院的投资）和转移支付（养老金、失业救济金）。
Current expenditure maintains public services and supports current consumption. Capital expenditure adds to the nation’s capital stock and can boost long-run productive capacity, shifting the LRAS curve to the right.
经常性支出维持公共服务并支持当前消费。资本性支出增加国家的资本存量，并可提高长期生产能力，使长期总供给曲线向右移动。
Transfer payments are not counted in G when calculating AD, because they do not represent direct demand for goods and services; they are transfers of income from taxpayers to recipients.
在计算总需求时，转移支付不计入G，因为它们不直接代表对商品和服务的需求；它们是收入从纳税人向接受者的转移。
6. The Budget Balance: Surplus, Deficit and Balanced Budget | 预算平衡：盈余、赤字与平衡预算
The budget balance is the difference between total government tax revenue (T) and total government spending (G):
Budget Balance = T − G
预算平衡是政府税收总收入（T）与政府总支出（G）之间的差额：
预算平衡 = T − G
A balanced budget occurs when T = G. A budget surplus (T > G) means the government is taking more out of the circular flow than it injects, reducing AD. A budget deficit (T < G) injects more spending into the economy, boosting AD.
当 T = G 时出现平衡预算。预算盈余（T > G）意味着政府从循环流中提取的比注入的多，从而减少总需求。预算赤字（T < G）则向经济注入更多支出，提振总需求。
Deficits can be structural (due to long-term policy) or cyclical (caused by an economic downturn). Persistent deficits add to the national debt.
赤字可能是结构性的（源于长期政策）或周期性的（由经济衰退引起）。持续的赤字会增加国债。
7. Expansionary Fiscal Policy | 扩张性财政政策
Expansionary fiscal policy aims to increase aggregate demand during a recession or when unemployment is high. The main tools are: increasing government spending (G) and/or cutting taxes (which raises disposable income and consumption C).
扩张性财政政策旨在在经济衰退或失业率高企时增加总需求。主要工具是：增加政府支出（G）和/或减税（提高可支配收入和消费C）。
A higher G directly raises AD; lower taxes leave households and firms with more money to spend. The policy is usually financed by a budget deficit, meaning the government borrows more.
较高的G直接增加总需求；减税使家庭和企业有更多资金可用于支出。该政策通常通过预算赤字融资，意味着政府借贷增加。
The initial injection can lead to a multiplied rise in national income. The simple multiplier formula is:
Multiplier = 1 / (1 − MPC) = 1 / (MPS + MPT + MPM)
初始注入可导致国民收入成倍增长。简单的乘数公式为：
乘数 = 1 / (1 − MPC) = 1 / (MPS + MPT + MPM)
Where MPC = marginal propensity to consume, MPS = marginal propensity to save, MPT = marginal propensity to tax, MPM = marginal propensity to import. The larger the MPC, the larger the multiplier.
其中MPC = 边际消费倾向，MPS = 边际储蓄倾向，MPT = 边际税收倾向，MPM = 边际进口倾向。MPC 越大，乘数越大。
If the economy is near full capacity, expansionary policy can cause demand-pull inflation rather than real growth.
如果经济接近充分产能，扩张性政策可能导致需求拉动型通货膨胀，而非实际增长。
8. Contractionary Fiscal Policy | 紧缩性财政政策
Contractionary fiscal policy is used to reduce aggregate demand, typically to control inflation or shrink a large budget deficit. It involves decreasing government spending and/or increasing taxes.
紧缩性财政政策用于减少总需求，通常是为了控制通货膨胀或缩小庞大的预算赤字。它涉及减少政府支出和/或增加税收。
Lower G and higher taxes reduce disposable income and consumption, shifting AD to the left. This can slow down price rises but may also increase unemployment in the short run.
较低的G和较高的税收会减少可支配收入和消费，使总需求左移。这可以减缓物价上涨，但短期内也可能增加失业。
Fiscal drag occurs when inflation pushes incomes into higher tax brackets, increasing the
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