Edexcel A-Level Economics 1.6.5: Impact of Government Intervention | Edexcel A-Level 经济学 1.6.5：政府干预的影响

📚 Edexcel A-Level Economics 1.6.5: Impact of Government Intervention | Edexcel A-Level 经济学 1.6.5：政府干预的影响

Government intervention occurs when the state alters the free-market allocation of resources to achieve objectives such as equity, correction of externalities, stability, or protection of consumers and producers. In Edexcel A-Level Economics A, specification point 1.6.5 requires you to analyse how taxes, subsidies, price controls, regulation, and information provision affect consumers, producers, and the government, and to evaluate the risk of government failure.

政府干预是指国家改变自由市场的资源配置，以实现公平、纠正外部性、稳定经济或保护消费者和生产者等目标。在 Edexcel A-Level Economics A 中，考点 1.6.5 要求你分析税收、补贴、价格控制、监管和信息提供如何影响消费者、生产者和政府，并评估政府失灵的风险。

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1. Why Governments Intervene | 政府干预的原因

Markets may fail because of externalities, public goods, information gaps, monopoly power, or income inequality. Intervention aims to correct these failures and improve overall welfare.

市场可能因外部性、公共物品、信息缺口、垄断势力或收入不平等而失灵。干预旨在纠正这些失灵并提高整体福利。

Common tools include indirect taxes, subsidies, maximum and minimum prices, regulation, and state provision of information. Each tool changes incentives for consumers and producers.

常见工具包括间接税、补贴、最高和最低价格、监管以及政府提供信息。每种工具都会改变消费者和生产者的激励。

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2. Indirect Taxes: Effects on Consumers | 间接税：对消费者的影响

An indirect tax shifts the supply curve vertically upward by the amount of the tax. The market price rises, so consumers pay a higher price and consume a lower quantity. The consumer incidence of the tax depends on the relative price elasticities of demand and supply.

间接税使供给曲线向上垂直移动税额幅度。市场价格上升，因此消费者支付更高价格并消费更少数量。消费者的税负取决于需求与供给的相对价格弹性。

If demand is price-inelastic, such as for cigarettes, consumers bear most of the tax burden because quantity demanded falls only slightly when price rises. This makes indirect taxes a strong tool for raising revenue and reducing consumption of demerit goods.

如果需求缺乏价格弹性，例如香烟，消费者承担大部分税负，因为价格上升时需求量仅略有下降。这使得间接税成为增加财政收入和减少有害品消费的有力工具。

Price elasticity of demand | 需求价格弹性	Who bears most tax? | 谁承担大部分税收？
Inelastic demand	Consumers | 消费者
Elastic demand	Producers | 生产者

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3. Indirect Taxes: Effects on Producers and Government | 间接税：对生产者和政府的影响

Producers receive a lower net price after paying the tax to the government, and their sales fall. Producer surplus shrinks, and in some cases some firms may leave the market, reducing competition.

生产者在向政府缴纳税款后得到的净价更低，销量下降。生产者剩余减少，某些情况下部分企业可能退出市场，竞争减少。

The government gains tax revenue equal to the per-unit tax multiplied by the quantity sold, which can be used to fund public services or reduce other taxes. However, the revenue may be lower than expected if demand is very elastic.

政府获得等于每单位税额乘以销售量的税收收入，可用于资助公共服务或减少其他税收。然而，如果需求非常有弹性，收入可能低于预期。

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4. Subsidies: Effects on Consumers and Producers | 补贴：对消费者和生产者的影响

A subsidy shifts the supply curve downward by the subsidy amount. Consumers pay a lower price and buy more, while producers receive a higher net price and sell more. Both consumer and producer surplus can increase.

补贴使供给曲线向下移动补贴金额。消费者支付更低价格并购买更多，而生产者获得更高净价并销售更多。消费者剩余和生产者剩余都可能增加。

The cost to the government is the per-unit subsidy multiplied by the quantity, which has an opportunity cost in terms of other public spending or higher taxes. Subsidies can encourage overproduction and may encourage dependence on state support.

政府的成本是每单位补贴乘以数量，这存在机会成本，表现为其他公共支出减少或税收增加。补贴可能鼓励过度生产，并可能导致对政府支持的依赖。

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5. Maximum Prices (Price Ceilings) | 最高限价

A maximum price is set below the equilibrium price to make goods affordable. It creates excess demand, so quantity demanded exceeds quantity supplied, leading to shortages.

最高价格设定在均衡价格以下，使商品更易负担。它造成超额需求，即需求量超过供给量，导致短缺。

Consumers who can buy at the lower price gain, but many consumers cannot obtain the good. Producers receive lower revenue and may reduce quality or create a black market.

能以低价购买的消费者受益，但许多消费者无法获得商品。生产者收入下降，可能降低质量或形成黑市。

Governments may need to ration the good, which adds administration costs and can be unfair. Rent controls are a classic example where maximum prices can reduce the supply of rented housing.

政府可能需要对商品实行配给，这会增加管理成本，并可能不公平。租金管制是一个典型例子，最高价格会减少出租住房的供给。

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6. Minimum Prices (Price Floors) | 最低限价

A minimum price is set above the equilibrium price to protect producers or workers, for example the national minimum wage or agricultural price floors. It creates excess supply because quantity supplied exceeds quantity demanded.

最低价格设定在均衡价格以上，以保护生产者或工人，例如国家最低工资或农产品价格下限。它造成超额供给，因为供给量超过需求量。

Workers who keep their jobs at the minimum wage earn higher income, but some workers may become unemployed. Producers gain from higher prices, but the government may need to purchase surplus output, as in agricultural support schemes.

在最低工资下保住工作的工人收入更高，但部分工人可能失业。生产者因价格较高而受益，但政府可能需要购买剩余产出，如农业支持计划。

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7. Regulation and Information Provision | 监管与信息提供

Regulation sets rules to limit harmful behaviour, such as bans on advertising to children, environmental standards, or mandatory safety features. It can correct externalities but imposes compliance costs on producers, which may raise prices.

监管制定规则限制有害行为，例如禁止向儿童投放广告、环境标准或强制性安全功能。它可以纠正外部性，但会给生产者带来合规成本，可能推高价格。

Information provision, such as public health campaigns or labels, helps consumers make better decisions. It is relatively cheap but may be ineffective if consumers ignore it or if information gaps are too complex.

信息提供，例如公共卫生运动或标签，帮助消费者做出更明智的决策。它相对便宜，但如果消费者忽视或信息缺口过于复杂，可能无效。

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8. Government Intervention and Efficiency | 政府干预与效率

Well-designed intervention can move the market closer to the socially optimal output when externalities exist, reducing deadweight loss. However, intervention can also create new deadweight loss if it distorts prices and quantities away from equilibrium.

设计良好的干预可以在存在外部性时使市场更接近社会最优产出，减少无谓损失。然而，如果干预使价格和数量偏离均衡，也会产生新的无谓损失。

For example, a tax equal to the marginal external cost internalises

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