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AP Microeconomics: A Complete Revision Guide | AP微观经济学完整复习指南

2023-09-05 14:35 · 本文部分内容由AI辅助创作

📚 AP Microeconomics: A Complete Revision Guide | AP微观经济学完整复习指南

The AP Microeconomics course is designed to build a solid foundation in economic principles, guiding students through how individual players - consumers and producers alike - make choices within the larger economy. The curriculum zeroes in on product markets: how they work, what drives them, and how they shape outcomes. Beyond that, students examine factor markets and investigate the ways government intervention can nudge the economy toward both greater efficiency and a fairer distribution of resources. The sections below offer a closer look at these core topics, along with directions teachers might take for deeper exploration.

AP微观经济学课程旨在为学生打下扎实的经济学原理基础，引导学生理解消费者与生产者这些个体参与者，如何在更大的经济体系中做出选择。课程重点聚焦产品市场：它们如何运行、由什么驱动、又会产生什么结果。除此之外，学生还要研究要素市场，并探讨政府干预如何推动经济走向更高的效率，以及更公平的资源分配。下文将逐一展开这些核心主题，并给出教师可用来做深入探究的方向。

1. Course Overview and Exam Structure | 课程概览与考试结构

AP Microeconomics is a one-semester, college-level course that introduces students to the behaviour of individual decision-making units. It is the mirror image of AP Macroeconomics: where macro looks at aggregates such as inflation and GDP, micro zooms in on a single market, a single firm, or a single consumer.

AP微观经济学是一门为期一学期、达到大学水平的课程，向学生介绍个体决策单位的行为。它可以说是AP宏观经济学的镜像：宏观关注通胀、GDP这样的总量，微观则把镜头推近到单个市场、单个企业或单个消费者。

The exam is split into two sections. Section I contains 60 multiple-choice questions to be answered in 70 minutes and accounts for two thirds of the total score. Section II contains three free-response questions - one long and two short - to be answered in 60 minutes, and accounts for the remaining one third. Calculators are not permitted, but you will be expected to perform simple arithmetic and read graphs fluently.

考试分为两部分。第一部分是60道选择题，70分钟内完成，占总分的三分之二。第二部分是3道自由作答题——一道长题、两道短题——60分钟内完成，占剩余的三分之一。考试不允许使用计算器，但你需要能熟练进行简单运算并读懂图表。

The course content itself is organised into six units, each with a published weighting range so that students can budget revision time sensibly.

课程内容本身被组织成六个单元，每个单元都公布了占比范围，便于学生合理安排复习时间。

Unit Topic Exam Weighting
1 Basic Economic Concepts 12-15%
2 Supply and Demand 20-25%
3 Production, Cost, and the Perfect Competition Model 22-25%
4 Imperfect Competition 15-22%
5 Factor Markets 10-13%
6 Market Failure and the Role of Government 8-13%

Notice that Unit 3 carries the heaviest single weight. Cost curves and the perfect competition model appear in almost every free-response question, so they deserve the most graph practice.

请注意，第三单元是单个占比最重的单元。成本曲线和完全竞争模型几乎出现在每一道自由作答题中，因此它们最值得反复进行画图训练。

2. Scarcity, Opportunity Cost and the Production Possibilities Curve | 稀缺性、机会成本与生产可能性曲线

Economics begins with scarcity: resources are finite while wants are unlimited, so every choice carries a cost. Opportunity cost is the value of the next best alternative forgone, and it is the single most examined concept in Unit 1. It is not simply the money paid; it includes the time, effort and alternatives sacrificed.

经济学始于稀缺性：资源有限而欲望无穷，因此每一次选择都带有成本。机会成本是被放弃的次优选择的价值，这是第一单元中考得最多的单一概念。它不只是支付的货币，还包括牺牲掉的时间、精力和其他备选方案。

The production possibilities curve (PPC) illustrates scarcity, choice and opportunity cost in one diagram. A point on the curve is productively efficient; a point inside it means resources are unemployed or misallocated; a point outside it is currently unattainable.

生产可能性曲线（PPC）用一张图同时说明稀缺性、选择与机会成本。曲线上的点表示生产有效率；曲线内的点意味着资源未被充分利用或配置失当；曲线外的点则是当前无法实现的。

The shape of the PPC matters. Because resources are not perfectly interchangeable between the two goods, the curve is bowed outward (concave to the origin), which means the opportunity cost of producing more of one good rises as you produce more of it - the law of increasing opportunity cost. Constant opportunity cost produces a straight line, and that only happens when the two goods use identical resources in identical proportions.

PPC的形状很重要。由于两种商品之间的资源并非可以完全互换，曲线向外凸出（相对于原点呈凹形），这意味着多生产某一种商品的机会成本会随着产量增加而上升——这就是机会成本递增规律。机会成本不变则对应一条直线，而这只有在两种商品以相同比例使用完全相同的资源时才会出现。

For deeper exploration, teachers can ask students to model a two-country, two-good scenario and derive the terms of trade that make both parties better off - typically between the two domestic opportunity cost ratios.

作为深入探究，教师可以让学生构建一个两国两商品模型，并推导出让双方都获益的贸易条件——通常落在两国国内机会成本比率之间。

3. Supply, Demand and Market Equilibrium | 供给、需求与市场均衡

Supply and demand is the analytical engine of the whole course. Demand shows the various quantities consumers are willing and able to buy at each price, holding everything else constant; supply shows the same for producers. The demand curve slopes downward because of the substitution and income effects; the supply curve slopes upward because higher prices cover rising marginal costs.

供给与需求是整个课程的分析引擎。需求表示在其他条件不变时，消费者在每个价格上愿意且能够购买的各种数量；供给则表示生产者的对应情况。需求曲线向下倾斜，源于替代效应和收入效应；供给曲线向上倾斜，则是因为更高的价格能够覆盖不断上升的边际成本。

The most common examinable error is confusing a movement along a curve with a shift of the curve. A change in the good's own price moves you along the curve; a change in any other determinant shifts the curve.

最常见的可考错误，是把"沿着曲线移动"与"曲线本身移动"混为一谈。商品自身价格的变化使你沿曲线移动；其他任何决定因素的变化才使曲线整体移动。

Equilibrium occurs where quantity demanded equals quantity supplied. Above it there is a surplus, which pushes price down; below it there is a shortage, which pushes price up. Double-shift questions are common: if demand and supply both change, one of price or quantity becomes indeterminate, and you must state that explicitly.

均衡出现在需求量等于供给量之处。价格高于均衡点会出现过剩，推动价格下跌；低于均衡点会出现短缺，推动价格上涨。双移动类题目很常见：如果需求和供给同时变化，价格或数量其中之一将变得不确定，你必须明确指出这一点。

Qd = Qs at equilibrium price P*

4. Elasticity and Its Applications | 弹性及其应用

Elasticity measures responsiveness. Price elasticity of demand (PED) is the percentage change in quantity demanded divided by the percentage change in price. Because of the inverse relationship, PED is normally reported as an absolute value.

弹性衡量的是反应程度。需求价格弹性（PED）等于需求量变化的百分比除以价格变化的百分比。由于两者呈反向关系，PED通常以绝对值报告。

PED = %ΔQd ÷ %ΔP

Three further elasticities complete the toolkit. Price elasticity of supply (PES) measures producer responsiveness. Cross-price elasticity of demand (XED) is positive for substitutes and negative for complements. Income elasticity of demand (YED) is positive for normal goods and negative for inferior goods.

另外三种弹性补全了这一工具包。供给价格弹性（PES）衡量生产者的反应程度。需求交叉价格弹性（XED）对替代品为正，对互补品为负。需求收入弹性（YED）对正常品为正，对劣等品为负。

Elasticity also determines tax incidence. When demand is more inelastic than supply, consumers bear the larger share of the tax burden, regardless of who legally writes the cheque. The more inelastic side of the market always absorbs more of the tax.

弹性还决定了税收归宿。当需求比供给更缺乏弹性时，无论法律上由谁缴税，消费者都承担更大份额的税负。市场中越缺乏弹性的一方，总是吸收更多税负。

5. Consumer Choice and Marginal Utility | 消费者选择与边际效用

Consumers are assumed to maximise total utility subject to a budget constraint. Marginal utility is the extra satisfaction from consuming one more unit, and the law of diminishing marginal utility says it falls as consumption rises.

我们假设消费者在预算约束下追求总效用最大化。边际效用是每多消费一单位所带来的额外满足感，而边际效用递减规律表明它会随消费量增加而下降。

Utility is maximised when the marginal utility per dollar spent is equal across all goods. If one good offers more satisfaction per dollar than another, the consumer should reallocate spending toward it until the ratios are equal.

当每一美元支出的边际效用在所有商品之间相等时，效用达到最大。如果某种商品每美元的满足感高于另一种，消费者就应把支出重新配置到前者，直到两者比率相等。

MU₁ ÷ P₁ = MU₂ ÷ P₂ = ... = MUₙ ÷ Pₙ

Two related ideas are worth flagging. First, consumer surplus is the difference between what a consumer is willing to pay and what they actually pay; it is the area below the demand curve and above the price. Second, a budget line shows all affordable combinations, and its slope is the relative price ratio -Px ÷ Py.

有两点相关概念值得标注。第一，消费者剩余是消费者愿意支付的价格与实际支付价格之间的差额；它是需求曲线以下、价格以上的面积。第二，预算线表示所有可负担的组合，其斜率为相对价格比 -Px ÷ Py。

A useful extension is to ask students why the demand curve is downward sloping using the substitution and income effects alone, without appealing to marginal utility - an exercise that sharpens both micro and macro intuition.

一个有用的拓展是让学生只用替代效应和收入效应来解释需求曲线为何向下倾斜，而不借助边际效用——这一练习能同时磨炼微观和宏观的直觉。

6. Production and Cost | 生产与成本

Firms convert inputs into output. In the short run at least one input is fixed, usually capital; in the long run all inputs are variable. The short-run production function shows total product, marginal product and average product, and it obeys the law of diminishing marginal returns.

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企业把投入转化为产出。在短期，至少有一种投入是固定的，通常是资本；在长期，所有投入都是可变的。短期生产函数展示总产量、边际产量和平均产量，并服从边际报酬递减规律。

Diminishing marginal returns set in when adding one more unit of a variable input yields a smaller increase in output than the previous unit, given fixed capital. Crucially, this is what makes marginal cost eventually rise - the two ideas are two sides of one coin.

当固定资本不变、多增加一单位可变投入所带来的产量增量小于上一单位时，边际报酬递减就出现了。关键在于，这正是边际成本最终上升的原因——这两个概念是同一枚硬币的两面。

The marginal-average relationship is a guaranteed exam favourite: MC cuts both ATC and AVC at their minimum points. When MC is below average cost, average cost is falling; when MC is above it, average cost is rising. Also distinguish economic profit (revenue minus explicit and implicit costs) from accounting profit (revenue minus explicit costs only).

边际与平均之间的关系是必考重点：MC在ATC和AVC的最低点与二者相交。当MC低于平均成本时，平均成本下降；当MC高于平均成本时，平均成本上升。此外要区分经济利润（收入减去显性成本与隐性成本）与会计利润（收入只减显性成本）。

In the long run, economies of scale push the long-run ATC curve down, while diseconomies of scale push it up, producing the familiar U shape for a different reason than in the short run.

在长期，规模经济使长期ATC曲线下降，规模不经济使其上升，从而形成熟悉的U形——但其成因与短期不同。

7. Perfect Competition | 完全竞争

Perfect competition rests on four assumptions: many small firms, a homogeneous product, no barriers to entry or exit, and perfect information. Each firm is a price taker, facing a horizontal demand curve at the market price.

完全竞争建立在四个假设之上：大量小企业、同质产品、进出无障碍、信息完全。每家企业都是价格接受者，面对一条位于市场价格上的水平需求曲线。

where marginal revenue equals marginal cost, provided price covers average variable cost.

对价格接受者而言，价格等于边际收益、平均收益和需求：P = MR = AR = D。在边际收益等于边际成本处利润最大，前提是价格能够覆盖平均可变成本。

Profit maximisation: MR = MC, with P ≥ min AVC

in ATC, and economic profit is zero. Firms earn only a normal profit, and both allocative and productive efficiency hold. This benchmark is then used as the yardstick against which monopolies are judged.

完全竞争的长期均衡条件是 P = MR = MC = min ATC，此时经济利润为零。企业只获得正常利润，配置效率与生产效率同时成立。这一基准随后被用作评判垄断的标尺。

8. Monopoly | 垄断

A monopoly is a single seller producing a unique good with high barriers to entry. Barriers may be legal (patents, licences), natural (one firm can serve the market at lower cost than two), or control of a key resource.

垄断是单一卖者生产独一无二的产品，且进入壁垒很高。壁垒可能是法律性的（专利、牌照）、自然性的（一家企业服务市场的成本低于两家），或对关键资源的控制。

Because the monopolist faces the entire downward-sloping market demand curve, marginal revenue is always below price: MR < P. Each extra unit sold requires lowering the price on all units, so revenue rises more slowly than output.

由于垄断者面对整条向下倾斜的市场需求曲线，边际收益始终低于价格：MR < P。多卖一单位必须降低所有单位的价格，因此收益的增长慢于产量的增长。

, then reads price off the demand curve at that quantity. This yields P > MC, so output is lower and price higher than the socially optimal level, creating deadweight loss. Monopolies may still earn long-run economic profit because entry is blocked.

垄断者在 MR = MC 处生产，然后沿该产量对应的需求曲线读出价格。这导致 P > MC，产量低于社会最优水平、价格高于社会最优水平，并造成无谓损失。由于进入被阻断，垄断者可以在长期仍获得经济利润。

A powerful extension task is to compare deadweight loss under a single-price monopoly and a perfectly price-discriminating monopoly, then ask whether total surplus genuinely rises.

一个很有价值的拓展任务，是比较单一价格垄断与完全价格歧视垄断下的无谓损失，然后追问总剩余是否真的上升了。

9. Monopolistic Competition and Oligopoly | 垄断竞争与寡头

Monopolistic competition combines many sellers with differentiated products and free entry. In the short run a firm behaves like a small monopolist and may earn economic profit. In the long run entry shifts demand leftward until price equals average total cost and economic profit falls to zero.

垄断竞争把大量卖者与差异化产品、自由进入结合在一起。短期中企业表现得像一个小垄断者，可能获得经济利润。长期中，进入使需求左移，直到价格等于平均总成本，经济利润降为零。

Two inefficiencies persist. Price exceeds marginal cost, so output is allocatively inefficient, and firms operate with excess capacity because they produce less than the output that minimises ATC.

两种无效率持续存在。价格高于边际成本，因此产出未达配置效率；企业存在过剩产能，因为其产量低于使ATC最小的产量。

Oligopoly is a market with a few interdependent firms, where each firm's best action depends on rivals' actions. Game theory is the natural analytical tool. The prisoner's dilemma explains why firms often end up in a Nash equilibrium that leaves them worse off than if they had cooperated.

寡头是少数几家相互依赖的企业构成的市场，每家企业的最优行动都取决于对手的行动。博弈论是天然的分析工具。囚徒困境解释了企业为何常常落入一个纳什均衡，而这个结果比它们合作时更糟。

10. Factor Markets | 要素市场

Factor markets deal with the demand for and supply of labour, capital and land. The demand for labour is a derived demand: firms hire workers not for their own sake but because workers produce goods consumers want.

要素市场研究劳动、资本和土地的需求与供给。劳动需求是一种派生需求：企业雇用工人的目的不是为了工人本身，而是因为工人生产了消费者想要的商品。

The marginal revenue product of labour (MRP) equals marginal product multiplied by marginal revenue, and it is the firm's labour demand curve. A profit-maximising firm hires until marginal revenue product equals the marginal resource cost of labour.

劳动的边际收益产品（MRP）等于边际产量乘以边际收益，它构成企业的劳动需求曲线。追求利润最大化的企业会一直雇佣到边际收益产品等于劳动的边际资源成本为止。

MRP = MP × MR and Hire until MRP = MRC

In a perfectly competitive labour market the wage is set by market supply and demand, and each firm is a wage taker. In a monopsony, a single employer faces an upward-sloping labour supply curve, so hiring one more worker raises the wage for everyone. Marginal resource cost therefore exceeds the wage, and the monopsonist hires fewer workers at a lower wage than the competitive outcome.

在完全竞争的劳动市场中，工资由市场供求决定，每家企业都是工资接受者。在买方垄断下，单一雇主面对向上倾斜的劳动供给曲线，因此多雇一名工人会抬高所有人的工资。于是边际资源成本高于工资，买方垄断者会比竞争性结果雇佣更少的工人、支付更低的工资。

This framework explains real-world pay gaps, minimum wage effects and the impact of unions, making it a rich area for extended discussion.

这一框架能解释现实中的薪酬差距、最低工资效应以及工会的影响，因此是一个可供深入讨论的丰富领域。

11. Market Failure and Government Intervention | 市场失灵与政府干预

Markets fail when they produce an inefficient allocation of resources. The four standard sources are externalities, public goods, common resources and imperfect information.

当市场产生无效率的资源配置时，就出现了市场失灵。四种标准来源是外部性、公共品、共有资源和信息不完全。

A negative externality occurs when a third party bears an uncompensated cost, such as pollution. Social marginal cost exceeds private marginal cost, so the market overproduces. A positive externality, such as education, means social marginal benefit exceeds private marginal benefit, so the market underproduces.

当第三方承担了未获补偿的成本（例如污染）时，就出现了负外部性。社会边际成本高于私人边际成本，因此市场过度生产。正外部性（例如教育）意味社会边际收益高于私人边际收益，因此市场生产不足。