📚 Fiscal Policy: How Government Spending and Taxation Regulate the Economy | 财政政策：政府收支如何调节经济
Fiscal policy refers to the use of government spending and taxation to influence the level of economic activity. It is one of the two main tools of macroeconomic management, alongside monetary policy. In this article, we will explore how governments use revenue and expenditure to achieve goals such as economic growth, price stability, and full employment.
财政政策是指政府通过支出和税收来影响经济活动水平的手段。它是宏观经济管理的两大工具之一，另一个是货币政策。在本文中，我们将探讨政府如何利用收入与支出来实现经济增长、价格稳定和充分就业等目标。
1. What Is Fiscal Policy? | 什么是财政政策
Fiscal policy is the government’s policy regarding its own spending, taxation, and borrowing. When the government changes its spending levels or tax rates, it directly affects aggregate demand in the economy. Aggregate demand (AD) is the total spending on goods and services within an economy at a given price level and in a given time period.
财政政策是政府关于自身支出、税收和借贷的政策。当政府改变其支出水平或税率时，会直接影响经济中的总需求。总需求（AD）是指在给定价格水平和给定时间段内，经济中对商品和服务的总支出。
Fiscal policy has two broad categories: expansionary and contractionary. An expansionary fiscal policy involves increasing government spending and/or reducing taxes to boost aggregate demand. A contractionary fiscal policy involves decreasing government spending and/or increasing taxes to reduce aggregate demand.
财政政策分为两大类：扩张性财政政策和紧缩性财政政策。扩张性财政政策包括增加政府支出和/或减少税收，以刺激总需求。紧缩性财政政策包括减少政府支出和/或增加税收，以降低总需求。
AD = C + I + G + (X − M)
In this equation, C represents consumer spending, I represents investment, G represents government spending, and (X − M) represents net exports. Fiscal policy mainly works through G and also affects C and I via taxation.
在这个公式中，C代表消费者支出，I代表投资，G代表政府支出，(X − M)代表净出口。财政政策主要通过G发挥作用，同时也通过税收影响C和I。
2. Government Revenue: Sources of Income | 政府收入：收入来源
Governments need revenue to finance their expenditure. The main sources of government revenue include direct taxes, indirect taxes, and non-tax revenue such as fees, fines, and income from state-owned enterprises.
政府需要收入来为其支出提供资金。政府收入的主要来源包括直接税、间接税以及非税收收入，如收费、罚款和国有企业收入。
Direct taxes are taxes levied on income and wealth. Examples include personal income tax, corporate income tax, and capital gains tax. Direct taxes are usually progressive, meaning that the tax rate increases as income increases. This helps to reduce income inequality.
直接税是对收入和财富征收的税。例如个人所得税、企业所得税和资本利得税。直接税通常是累进的，意味着税率随着收入的增加而提高。这有助于减少收入不平等。
Indirect taxes are taxes levied on spending on goods and services. Examples include value-added tax (VAT), excise duties on cigarettes and alcohol, and import tariffs. Indirect taxes are often regressive, as they take up a larger proportion of income from lower-income households.
间接税是对商品和服务支出征收的税。例如增值税（VAT）、对香烟和酒类征收的消费税以及进口关税。间接税通常是累退的，因为它们在低收入家庭收入中占较大比例。
- Personal income tax — a direct tax on individual earnings
- Corporate income tax — a direct tax on firm profits
- Value-added tax (VAT) — an indirect tax on consumption
- Excise duties — indirect taxes on specific goods like fuel and tobacco
- Customs duties — taxes on imported goods
- National insurance contributions — payments for social security
- 个人所得税——对个人收入征收的直接税
- 企业所得税——对企业利润征收的直接税
- 增值税（VAT）——对消费征收的间接税
- 消费税——对燃料和烟草等特定商品征收的间接税
- 关税——对进口商品征收的税
- 国民保险缴款——用于社会保障的支付
3. Government Expenditure: Where the Money Goes | 政府支出：钱花在哪里
Government expenditure can be classified into current expenditure, capital expenditure, and transfer payments. Current expenditure includes day-to-day spending on public services such as salaries of teachers and police officers. Capital expenditure includes spending on infrastructure such as roads, schools, and hospitals. Transfer payments are government payments to individuals without any exchange of goods or services, such as pensions, unemployment benefits, and child benefits.
政府支出可分为经常性支出、资本性支出和转移支付。经常性支出包括公共服务方面的日常支出，如教师和警察的工资。资本性支出包括道路、学校和医院等基础设施支出。转移支付是政府向个人支付的款项，而不需要交换任何商品或服务，如养老金、失业救济金和儿童福利。
Transfer payments are important for equity because they redistribute income from taxpayers to those in need. However, they are not included in GDP because they are not payments for current production of goods or services. They do, however, increase the disposable income of recipients, which can then be spent on consumption.
转移支付对公平很重要，因为它们将收入从纳税人重新分配给有需要的人。然而，转移支付不计入GDP，因为它们不是对当期商品或服务生产的支付。不过，转移支付确实增加了受助人的可支配收入，这些收入随后可以用于消费。
| Type of expenditure | Examples | Effect on AD |
| Current expenditure | Wages, utilities, maintenance | Direct increase in AD |
| Capital expenditure | Infrastructure, buildings | Increases AD and long-run capacity |
| Transfer payments | Pensions, benefits | Increase AD indirectly via consumption |
| 支出类型 | 例子 | 对总需求的影响 |
| 经常性支出 | 工资、水电、维护 | 直接增加总需求 |
| 资本性支出 | 基础设施、建筑物 | 增加总需求和长期产能 |
| 转移支付 | 养老金、福利 | 通过消费间接增加总需求 |
4. Expansionary Fiscal Policy | 扩张性财政政策
Expansionary fiscal policy is used when the economy is in a recession or suffering from high unemployment. The government increases its spending and/or cuts taxes to raise aggregate demand. This is also called a reflationary policy.
当经济处于衰退或面临高失业率时，会采用扩张性财政政策。政府增加支出和/或减税以提高总需求。这也被称为通货再膨胀政策。
When the government spends more, it directly injects money into the economy. For example, building a new motorway creates jobs for construction workers, who then spend their wages on food, housing, and entertainment. This additional spending creates further income and employment in other sectors. This is known as the multiplier effect.
当政府增加支出时，它直接向经济注入资金。例如，修建一条新高速公路为建筑工人创造就业机会，他们然后将工资用于食品、住房和娱乐。这些额外支出在其他部门创造了更多收入和就业。这被称为乘数效应。
Tax cuts have a similar effect. When consumers pay less tax, their disposable income rises, and they tend to spend more. Firms may also benefit from lower corporate taxes, allowing them to invest more. Both effects shift the aggregate demand curve to the right.
减税也有类似效果。当消费者缴纳较少的税时，他们的可支配收入增加，往往会增加消费。企业也可能受益于较低的企业税，从而增加投资。这两种效应都会使总需求曲线向右移动。
However, expansionary fiscal policy may lead to a budget deficit, when government spending exceeds tax revenue. If the deficit is financed by borrowing, it increases national debt. In the long run, high debt may crowd out private investment and cause higher interest rates.
然而，扩张性财政政策可能导致预算赤字，即政府支出超过税收收入。如果赤字通过借债来融资，就会增加国债。从长远来看，高债务可能会挤出私人投资并导致利率上升。
5. Contractionary Fiscal Policy | 紧缩性财政政策
Contractionary fiscal policy is used when the economy is overheating and inflation is rising. The government reduces spending and/or increases taxes to reduce aggregate demand. This is also called deflationary policy.
当经济过热且通胀上升时，会采用紧缩性财政政策。政府减少支出和/或增税以降低总需求。这也被称为通货紧缩政策。
By reducing government spending, the government lowers the level of injections into the circular flow of income. Increasing taxes reduces disposable income, which reduces consumer spending. These actions shift the aggregate demand curve to the left, helping to bring down price levels.
通过减少政府支出，政府降低了流入收入循环流程的注入量。增加税收减少可支配收入，从而减少消费者支出。这些措施使总需求曲线向左移动，有助于降低价格水平。
Contractionary fiscal policy is also used to reduce budget deficits and national debt. When a government runs a budget surplus — tax revenue greater than spending — it can pay off existing debt and reduce borrowing pressure.
紧缩性财政政策也用于减少预算赤字和国债。当政府实现预算盈余——税收收入大于支出时——它可以偿还现有债务并减少借贷压力。
However, if applied too aggressively, contractionary fiscal policy can slow economic growth and cause unemployment to rise. Policymakers must strike a careful balance between controlling inflation and maintaining economic activity.
然而，如果运用过于激进，紧缩性财政政策可能减缓经济增长并导致失业率上升。政策制定者必须在控制通胀和维持经济活动之间取得谨慎的平衡。
6. The Multiplier Effect | 乘数效应
The multiplier effect explains how an initial change in spending leads to a larger final change in national income. Suppose the government spends an additional $100 million on road construction. Workers receive wages and spend a portion of that income on goods and services. Shopkeepers and producers receive this money and spend it again, and so on.
乘数效应解释了初始支出变化如何导致国民收入更大规模的最终变化。假设政府额外支出1亿美元用于道路建设。工人获得工资并将其中一部分收入用于商品和服务。店主和生产者也获得这笔钱并再次支出，如此循环。
The size of the multiplier depends on the marginal propensity to consume (MPC). If households spend 80% of any extra income (MPC = 0.8), then $100 million of initial spending generates:
乘数的大小取决于边际消费倾向（MPC）。如果家庭将任何额外收入的80%用于支出（MPC = 0.8），那么1亿美元的初始支出会产生：
Multiplier = 1 ÷ (1 − MPC) = 1 ÷ (1 − 0.8) = 5
Thus, the total increase in national income would be $100 million × 5 = $500 million. A higher MPC leads to a larger multiplier. Conversely, if households save a large proportion of extra income, the multiplier will be smaller, reducing the effectiveness of fiscal policy.
因此，国民收入的总增加量将是1亿美元 × 5 = 5亿美元。MPC越高，乘数越大。相反，如果家庭将额外收入的很大一部分储蓄起来，乘数将更小，从而降低财政政策的有效性。
In the IGCSE syllabus, you are expected to understand the multiplier effect conceptually and be able to calculate it using the formula above. The multiplier also works in reverse: a decrease in government spending can cause a proportionally larger decrease in national income.
在IGCSE教学大纲中，你需要从概念上理解乘数效应，并能够使用上述公式计算它。乘数效应也会反向作用：政府支出减少可能导致国民收入成比例地更大减少。
7. Automatic Stabilisers | 自动稳定器
Automatic stabilisers are features of the tax and benefit system that automatically reduce the impact of fluctuations in the business cycle, without any deliberate government action. They are built into the structure of fiscal policy.
自动稳定器是税收和福利制度的特征，无需政府采取任何有意的行动，就能自动减少商业周期波动的冲击。它们内置于财政政策的结构之中。
During a recession, incomes fall, so individuals pay less income tax. More people claim unemployment benefits and other welfare payments. These changes cushion the fall in aggregate demand. The budget automatically moves toward a deficit.
在经济衰退期间，收入下降，因此个人缴纳的所得税减少。更多人申领失业救济金和其他福利金。这些变化缓冲了总需求的下降。预算自动走向赤字。
During a boom, incomes rise, so tax revenue increases automatically. Unemployment benefits fall as more people find jobs. The budget automatically moves toward a surplus. These automatic changes help to cool down the economy and prevent inflation from accelerating.
在经济繁荣时期，收入增加，税收收入自动增加。随着更多人找到工作，失业救济金减少。预算自动走向盈余。这些自动变化有助于给经济降温并防止通胀加速。
The advantage of automatic stabilisers is that they work immediately and reduce the time lag involved in discretionary fiscal policy. However, they only moderate fluctuations — they cannot completely eliminate them.
自动稳定器的优点是它们能立即发挥作用，并减少了相机抉择财政政策所涉及的时间滞后期。然而，它们只能缓和波动——不能完全消除波动。
8. Budget Deficits and National Debt | 预算赤字与国债
A budget deficit occurs when government spending exceeds government revenue in a given financial year. The government must borrow to cover the gap. The national debt is the total accumulated amount that the government owes, resulting from years of deficits and borrowing.
预算赤字是指在某一财政年度，政府支出超过政府收入。政府必须借债来弥补缺口。国债是政府所欠的累计总额，是多年赤字和借贷的结果。
Deficits are sometimes necessary, especially during recessions or wars. However, persistent large deficits create problems. The government competes with the private sector for loanable funds, which can push up interest rates. High interest rates discourage investment and crowd out private sector activity.
赤字有时是必要的，特别是在经济衰退或战争期间。然而，持续的大量赤字会产生问题。政府与私人部门竞争可贷资金，这可能会推高利率。高利率抑制投资并挤出私人部门活动。
High national debt also imposes a burden on future generations, as taxes may need to be raised to service the debt. Additionally, a large proportion of government revenue may have to go toward interest payments instead of productive public services.
高国债也给后代带来负担，因为可能需要提高税收来偿还债务。此外，政府收入的很大一部分可能不得不用于支付利息，而不是用于生产性公共服务。
That said, if borrowed funds are used for productive capital investment, such as transport networks and education, the economy’s long-run productive capacity will improve. This can raise future growth and make the debt sustainable.
尽管如此，如果借来的资金用于生产性资本投资，如交通网络和教育，经济的长期生产能力将得到改善。这可以提高未来的增长并使债务具有可持续性。
9. Fiscal Policy and Economic Objectives | 财政政策与经济目标
Governments use fiscal policy to achieve several key macroeconomic objectives. Below is a summary of how fiscal tools help achieve these goals.
政府使用财政政策来实现若干关键的宏观经济目标。下面总结了财政工具如何帮助实现这些目标。
| Objective | Fiscal measure |
| Full employment | Increase government spending to create jobs |
| Price stability | Raise taxes and cut spending to reduce inflation |
| Economic growth | Invest in infrastructure and reduce corporate taxes |
| Redistribution of income | Progressive income tax and welfare transfers |
| Balance of payments | Tariffs and exchange rate policies |
| 目标 | 财政措施 |
| 充分就业 | 增加政府支出以创造就业 |
| 价格稳定 | 增税和削减支出以降低通胀 |
| 经济增长 | 投资基础设施和降低企业税 |
| 收入再分配 | 累进所得税和福利转移 |
| 国际收支 | 关税和汇率政策 |
It is important to note that fiscal policy may face trade-offs. For example, reducing unemployment may cause inflation, and reducing inflation may raise unemployment and slow growth. Governments must set priorities based on the state of the economy.
需要指出的是，财政政策可能面临权衡取舍。例如，降低失业可能导致通胀，而降低通胀可能导致失业上升和增长放缓。政府必须根据经济状况确定优先事项。
10. Limitations of Fiscal Policy | 财政政策的局限性
Fiscal policy is not always effective due to several limitations. First, time lags are a major problem. It takes time to recognise an economic problem, decide on policy measures, and implement them. By the time the policy takes effect, the economic situation may have already changed.
由于几个局限性，财政政策并非总是有效。首先，时间滞后是一个主要问题。识别经济问题、决定政策措施并实施这些措施需要时间。到政策生效时，经济形势可能已经发生变化。
Second, the crowding-out effect reduces the effectiveness of expansionary fiscal policy. If the government borrows heavily to finance spending, interest rates rise, which reduces private investment and consumption. The net increase in aggregate demand may be smaller than intended.
其次，挤出效应降低了扩张性财政政策的有效性。如果政府大量借贷来为支出融资，利率上升，这会减少私人投资和消费。总需求的净增加可能小于预期。
Third, expectations matter. If households and firms believe that a tax cut is temporary, they may save rather than spend it. Similarly, if they expect future tax increases to repay government debt, they may reduce current spending.
第三，预期很重要。如果家庭和企业认为减税是暂时的，他们可能会储蓄而不是消费。同样，如果他们预期未来会增税以偿还政府债务，他们可能会减少当前支出。
Finally, supply-side constraints may limit the impact of fiscal expansion. If the economy is already at full capacity, increasing demand will only cause inflation, not higher output. For example, a shortage of skilled labour or raw materials can prevent firms from expanding production.
最后，供给侧约束可能限制财政扩张的影响。如果经济已经处于满负荷产能状态，增加需求只会导致通胀，而不会带来更高的产出。例如，熟练劳动力或原材料的短缺可能阻止企业扩大生产。
Conclusion | 结论
Fiscal policy is a powerful tool that governments use to steer the economy towards desired outcomes. By adjusting spending and taxation, governments can influence aggregate demand, redistribute income, and stabilise economic fluctuations. However, fiscal policy must be applied cautiously, taking into account time lags, multiplier effects, the risk of crowding out, and the state of the public finances.
财政政策是政府用来引导经济走向预期结果的强大工具。通过调整支出和税收，政府可以影响总需求、再分配收入并稳定经济波动。然而，财政政策必须谨慎运用，充分考虑时间滞后、乘数效应、挤出风险以及公共财政状况。
For IGCSE students, it is essential to understand the mechanisms of expansionary and contractionary fiscal policy, the difference between direct and indirect taxes, the meaning of budget deficits and surpluses, and the limitations that constrain policy effectiveness. With this knowledge, you can critically evaluate how governments respond to economic challenges.
对于IGCSE学生而言，理解扩张性和紧缩性财政政策的作用机制、直接税与间接税的区别、预算赤字与盈余的含义，以及制约政策有效性的局限性至关重要。掌握这些知识后，你就能批判性地评价政府如何应对经济挑战。
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