📚 Year 10 SQA Economics: Core Knowledge Revision | 核心知识点梳理
The SQA National 5 Economics course provides a fascinating introduction to how markets work, why governments intervene, and how national economies perform. This revision guide condenses the key topics into digestible sections, covering microeconomics and macroeconomics as well as international trade. Whether you are preparing for an end-of-unit test or the final exam, mastering these core ideas will boost your confidence and your grade.
SQA 国家5经济学课程引人入胜，介绍了市场如何运行、政府为何干预以及国民经济表现。这份复习指南将核心知识点浓缩成易于理解的小节，涵盖微观经济学、宏观经济学和国际贸易。无论你是在准备单元测验还是最终考试，掌握这些核心概念都将提升你的信心和成绩。
1. The Basic Economic Problem | 基本经济问题
Scarcity arises because resources are limited but human wants are infinite. This forces individuals, firms and governments to make choices about what to produce, how to produce and for whom to produce. Because resources such as land, labour, capital and enterprise are finite, every decision involves a trade-off.
稀缺性源于资源有限而人类欲望无穷。这迫使个人、企业和政府就生产什么、如何生产和为谁生产作出选择。由于土地、劳动力、资本和企业才能等资源是有限的，每个决策都伴随着权衡取舍。
Opportunity cost is the value of the next best alternative forgone when a choice is made. For example, if a government spends more on healthcare, the opportunity cost might be fewer resources for education. Understanding opportunity cost helps us evaluate the real cost of decisions, not just the money spent.
机会成本是指做出选择时所放弃的次优方案的价值。例如，如果政府增加医疗保健支出，机会成本可能是教育资源减少。理解机会成本有助于我们评估决策的真实代价，而不仅仅是花费的金钱。
A production possibility curve (PPC) illustrates the maximum combinations of two goods an economy can produce with available resources and technology. Points inside the curve show inefficient use of resources, while points outside are unattainable. Shifts of the PPC represent economic growth, often caused by increases in the quantity or quality of factors of production.
生产可能性曲线演示了一个经济体在既定资源和技术下所能生产的两种商品的最大组合。曲线内的点表示资源利用无效率，曲线外的点无法达到。PPC 向外移动代表经济增长，通常由生产要素数量或质量提高引起。
2. Demand and Supply | 需求与供给
Demand is the quantity of a good consumers are willing and able to buy at each price over a given period. According to the law of demand, as price falls, quantity demanded rises, ceteris paribus. A movement along the demand curve occurs when the good’s own price changes. A shift of the entire demand curve is caused by non-price factors such as income, tastes, the price of substitutes or complements, population size and advertising.
需求是在给定时期内，消费者在不同价格下愿意且能够购买的商品数量。根据需求定律，在其他条件不变时，价格下降，需求量上升。商品自身价格变化引起沿需求曲线的移动。整个需求曲线的移动由非价格因素引起，例如收入、偏好、替代品或互补品价格、人口规模和广告。
Supply is the quantity producers are willing and able to offer for sale at each price. The law of supply states that a higher price generally leads to a higher quantity supplied. Shifts in supply result from changes in the costs of production (wages, raw materials, energy), technological progress, indirect taxes, subsidies and the number of sellers in the market.
供给是生产者在不同价格下愿意且能够出售的数量。供给定律表明，价格越高，供给量通常越大。供给曲线的移动源于生产成本（工资、原材料、能源）变化、技术进步、间接税、补贴以及市场中的卖家数量。
3. Price Elasticity of Demand and Supply | 需求与供给的价格弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. It is calculated as: % change in quantity demanded / % change in price. If PED > 1, demand is elastic and a price cut raises total revenue. If PED < 1, demand is inelastic and a price rise increases revenue. Factors such as the availability of substitutes, the proportion of income spent and whether the good is a necessity or luxury all affect PED.
需求价格弹性衡量需求量对价格变化的反应程度。计算公式为：需求量变化百分比 ÷ 价格变化百分比。如果 PED > 1，需求富有弹性，降价会增加总收益。如果 PED < 1，需求缺乏弹性，提价会增加收益。替代品可得性、支出占收入比例以及商品是必需品还是奢侈品等因素都会影响需求价格弹性。
Income elasticity of demand (YED) shows how demand changes with income. Normal goods have positive YED; inferior goods have negative YED. Cross elasticity of demand (XED) measures how the demand for one good responds to a price change in another. Substitutes have positive XED, while complements have negative XED.
需求收入弹性显示需求如何随收入变化。正常品的 YED 为正；劣等品的 YED 为负。需求交叉弹性衡量一种商品的需求对另一种商品价格变化的反应。替代品的 XED 为正，互补品的 XED 为负。
Price elasticity of supply (PES) measures how responsive quantity supplied is to a price change. PES is influenced by the time period, the flexibility of the production process and the availability of spare capacity. Supply tends to be more elastic in the long run as firms can adjust all inputs.
供给价格弹性衡量供给量对价格变化的反应程度。PES 受时间周期、生产流程的灵活性和闲置产能影响。长期中，企业能调整所有投入，供给往往更富有弹性。
4. Market Equilibrium and Shifts | 市场均衡与变动
Market equilibrium occurs when quantity demanded equals quantity supplied at a particular price. There is no tendency for change, and the market clears. If the price is set above equilibrium, a surplus (excess supply) exists and puts downward pressure on price. If price is below equilibrium, a shortage (excess demand) pushes price upwards.
市场均衡发生在某一价格下需求量等于供给量时。此时没有变动趋势，市场出清。如果价格高于均衡价格，出现过剩（超额供给），对价格形成下行压力。如果价格低于均衡价格，出现短缺（超额需求），推动价格上升。
Analysing shifts is vital: an increase in demand (rightward shift) raises both equilibrium price and quantity. An increase in supply (rightward shift) lowers equilibrium price but raises quantity. When both curves shift, the final outcome depends on the relative size of the shifts. Drawing clear demand and supply diagrams is essential for exam success.
分析曲线移动至关重要：需求增加（向右移动）会提高均衡价格和均衡数量。供给增加（向右移动）会降低均衡价格但提高均衡数量。当两条曲线同时移动时，最终结果取决于移动的相对幅度。清晰绘制需求与供给图表是考试成功的关键。
5. Market Failure and Externalities | 市场失灵与外部性
Market failure occurs when the price mechanism leads to an inefficient allocation of resources. Externalities are a common cause. A negative externality arises when the production or consumption of a good imposes costs on third parties not compensated, e.g. pollution from a factory. The social cost exceeds the private cost, resulting in overproduction.
市场失灵指价格机制导致资源配置无效率。外部性是常见原因。负外部性指商品的生产或消费给第三方带来未获补偿的成本，例如工厂污染。社会成本超过私人成本，导致过度生产。
A positive externality exists when social benefits exceed private benefits, e.g. education or vaccination. In a free market, such goods tend to be under-produced and under-consumed. Governments can correct externalities through taxation, subsidies, regulation or direct provision.
当社会收益大于私人收益时存在正外部性，例如教育或疫苗接种。在自由市场中，这类商品往往生产不足、消费不足。政府可以通过征税、补贴、监管或直接提供来纠正外部性。
Other sources of market failure include public goods (non-rival and non-excludable, such as street lighting), information gaps, monopoly power and factor immobility. These all prevent the market from achieving allocative efficiency.
其他市场失灵原因包括公共物品（非竞争性和非排他性，如路灯）、信息不对称、垄断势力以及生产要素不流动。这些都会阻碍市场实现配置效率。
6. Government Intervention | 政府干预
Governments use a range of microeconomic policies to correct market failure. Indirect taxes, such as excise duties on tobacco or sugar, internalise negative externalities by raising the private cost of production or consumption. The tax revenue can be used to fund public services.
政府采用一系列微观经济政策来纠正市场失灵。间接税（如烟草税或糖税）通过提高生产或消费的私人成本，将负外部性内部化。税收收入可用于资助公共服务。
Subsidies lower the cost of production for goods with positive externalities, shifting the supply curve to the right and increasing output. Maximum prices (ceilings) are sometimes used to make essentials like housing more affordable, but they can create shortages. Minimum prices (floors) guarantee a minimum income for producers, e.g. minimum wage or agricultural price supports, but may lead to surpluses.
补贴降低具有正外部性商品的生产成本，使供给曲线右移并增加产量。最高限价有时用于让住房等必需品更可负担，但可能导致短缺。最低限价保证生产者最低收入，例如最低工资或农产品价格支持，但可能导致过剩。
Regulation and direct state provision are also important. Banning harmful activities, setting emission standards or providing free healthcare can directly improve social welfare. The effectiveness of each policy depends on careful design and enforcement.
监管和国家直接提供也很重要。禁止有害活动、设定排放标准或提供免费医疗可以直接改善社会福利。每种政策的有效性取决于精心的设计和执行。
7. Macroeconomic Aims | 宏观经济目标
All governments pursue four main macroeconomic objectives: sustainable economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments position on the current account. Some governments also aim for a fairer distribution of income and protection of the environment.
所有政府都追求四个主要宏观经济目标：可持续经济增长、低且稳定的通货膨胀、低失业率和令人满意的经常账户国际收支状况。一些政府还致力于实现更公平的收入分配和环境保护。
These objectives can sometimes conflict. For example, rapid economic growth may cause higher inflation and worsen the trade balance if imports rise quickly. Policymakers face trade-offs and must prioritise objectives depending on the economic circumstances.
这些目标有时会发生冲突。例如，快速经济增长可能导致更高通胀，并因进口激增而恶化贸易差额。政策制定者面临权衡取舍，必须根据经济形势确定优先目标。
8. GDP and Economic Growth | 国内生产总值与经济增长
Gross Domestic Product (GDP) measures the total value of all final goods and services produced within a country in a given period, usually a year. It can be calculated using the output, income or expenditure approaches. Nominal GDP is measured at current prices, while real GDP is adjusted for inflation, giving a truer picture of economic growth.
国内生产总值 (GDP) 衡量一个国家在特定时期（通常一年）内生产的所有最终商品和服务的总价值。它可以通过产出法、收入法或支出法计算。名义 GDP 按照当期价格衡量，而实际 GDP 剔除了通货膨胀影响，能更真实地反映经济增长。
GDP per capita divides total GDP by the population, providing an average measure of living standards. However, GDP has limitations: it ignores non-market activities, the distribution of income, environmental damage and the quality of life. Alternative measures such as the Human Development Index (HDI) give a broader view of well-being.
人均 GDP 是将总 GDP 除以人口，提供生活水平的平均衡量指标。但 GDP 也有局限：它忽略非市场活动、收入分配、环境破坏和生活品质。人类发展指数 (HDI) 等替代性指标能更全面地反映福祉。
Economic growth is an increase in the productive capacity of the economy, shown by an outward shift of the PPC or a sustained rise in real GDP. It can be driven by increases in the quantity or quality of resources and technological progress. Benefits include higher living standards and more tax revenue, but costs such as pollution and resource depletion must also be considered.
经济增长是经济生产能力的提高，表现为 PPC 向外移动或实际 GDP 持续上升。它可以由资源数量或质量提高以及技术进步驱动。好处包括更高的生活水平和更多税收收入，但污染和资源耗竭等代价也必须考虑。
9. Inflation and Unemployment | 通货膨胀与失业
Inflation is a sustained rise in the general price level, reducing the purchasing power of money. In the UK, it is commonly measured by the Consumer Price Index (CPI). Demand-pull inflation occurs when aggregate demand grows faster than the economy's ability to produce, while cost-push inflation results from rising production costs such as wages or raw materials.
通货膨胀是总体物价水平持续上升，会降低货币购买力。英国通常用消费者价格指数 (CPI) 来衡量。需求拉动型通胀发生在总需求增速超过经济生产能力之时，而成本推动型通胀源于工资或原材料等生产成本上涨。
Unemployment refers to people who are actively seeking work but cannot find a job. The main types are frictional (short-term, between jobs), structural (mismatch of skills and location) and cyclical (caused by a lack of aggregate demand). The unemployment rate can be measured through the claimant count or the Labour Force Survey (LFS).
失业指积极寻找工作却找不到工作的人。主要类型包括摩擦性失业（短期，转换工作期间）、结构性失业（技能和地点不匹配）和周期性失业（由总需求不足引起）。失业率可以通过申请失业救济人数或劳动力调查来衡量。
Both high inflation and high unemployment impose significant social and economic costs: inflation erodes savings and distorts spending decisions; unemployment causes lost output, lower self-esteem and social problems. This is why they are key targets of macroeconomic policy.
高通膨和高失业都会带来巨大的社会和经济代价：通胀侵蚀储蓄并扭曲支出决策；失业导致产出损失、自尊降低和社会问题。这正是它们成为宏观经济政策关键目标的原因。
10. Fiscal and Monetary Policy | 财政政策与货币政策
Fiscal policy involves changes in government spending and taxation to influence the level of economic activity. Expansionary fiscal policy (higher spending or lower taxes) boosts aggregate demand and is used during a recession. Contractionary fiscal policy (lower spending or higher taxes) cools down an overheating economy. The government’s annual budget balance is the difference between tax revenue and spending.
财政政策通过改变政府支出和税收来影响经济活动水平。扩张性财政政策（增加支出或减税）能提振总需求，用于经济衰退期。紧缩性财政政策（减少支出或增税）则给过热的经济降温。政府年度预算平衡是税收收入与支出之差。
Automatic stabilisers are features of the tax and welfare system that smooth out fluctuations without deliberate policy action. For example, in a downturn, tax revenues fall and spending on unemployment benefits rises automatically, which cushions the fall in aggregate demand.
自动稳定器是税收和福利制度中无需刻意政策行动即可熨平波动的机制。例如，在经济低迷时期，税收收入自动下降而失业救济支出自动上升，从而缓解总需求的下滑。
Monetary policy, operated by the central bank (e.g. the Bank of England's Monetary Policy Committee), primarily uses the interest rate to control inflation and stabilise the economy. Lower interest rates encourage borrowing and spending, raising aggregate demand; higher rates do the opposite. Central banks can also use quantitative easing to inject money directly into the economy.
货币政策由中央银行执行（如英格兰银行货币政策委员会），主要运用利率控制通胀和稳定经济。降低利率鼓励借贷和支出，提高总需求；反之则抑制经济。中央银行还可运用量化宽松直接向经济体注入资金。
11. International Trade and Balance of Payments | 国际贸易与国际收支
International trade allows countries to specialise and benefit from comparative advantage, even if one country is more efficient in absolute terms. Specialisation increases total world output and gives consumers access to a wider variety of goods at lower prices. However, over-specialisation can make economies vulnerable to external shocks.
国际贸易使各国能够专业化生产并从比较优势中获益，即便一国在所有商品生产上都拥有绝对效率。专业化增加了全球总产出，让消费者以更低价格获得更多样化的商品。然而，过度专业化可能使经济体易受外部冲击影响。
Governments sometimes protect domestic industries through tariffs (taxes on imports), quotas (physical limits on imports) and subsidies to domestic producers. While protection may save jobs in the short run, it can raise consumer prices and reduce overall efficiency.
政府有时通过关税（对进口品征税）、配额（进口数量限制）和对国内生产者的补贴来保护国内产业。虽然贸易保护在短期内可能保住就业，但它会抬高消费价格并降低整体效率。
The balance of payments records all financial transactions between a country and the rest of the world. The current account includes trade in goods and services, primary income (wages, investment income) and secondary income (transfers). A current account deficit must be matched by a surplus on the capital and financial account, which records flows of investment and savings.
国际收支记录一国与世界其他地区之间的所有金融交易。经常账户包括商品和服务贸易、初次收入（工资、投资收益）和二次收入（转移支付）。经常账户赤字必须由记录投资和储蓄流动的资本与金融账户顺差来平衡。
12. Exchange Rates | 汇率
An exchange rate is the price of one currency in terms of another. Under a floating exchange rate system, the value is determined by supply and demand in the foreign exchange market. Factors such as interest rates, inflation, economic growth and speculation can cause the currency to appreciate or depreciate.
汇率是一种货币以另一种货币表示的价格。在浮动汇率制度下，币值由外汇市场的供求决定。利率、通胀率、经济增长和投机等因素会导致货币升值或贬值。
A depreciation makes exports cheaper and imports more expensive, which should improve the current account balance if demand for exports and imports is sufficiently elastic (the Marshall-Lerner condition). Conversely, an appreciation worsens competitiveness. A fixed exchange rate is set and maintained by the government or central bank, requiring sufficient reserves of foreign currency.
本币贬值使出口更便宜、进口更昂贵，如果进出口需求弹性足够大（马歇尔-勒纳条件），这应能改善经常账户差额。相反，升值会削弱竞争力。固定汇率由政府或央行设定并维护，需要足够的外汇储备。
Exchange rates matter for businesses and consumers because they affect the price of imported inputs, the cost of foreign holidays and the profitability of exporting firms. In a globalised economy, exchange rate movements have a direct impact on inflation and overall economic stability.
汇率对企业与消费者至关重要，因为它影响进口原料价格、出国度假成本以及出口企业的盈利。在全球化经济中，汇率变动直接影响通货膨胀和整体经济稳定。
Published by TutorHao | Economics Revision Series | aleveler.com
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