AP Macroeconomics: Key Content and Exam Strategies | AP宏观经济学考前核心内容与应试要点

📚 AP Macroeconomics: Key Content and Exam Strategies | AP宏观经济学考前核心内容与应试要点

AP Macroeconomics tests your understanding of how entire economies function, from measuring national output to designing fiscal and monetary policies. This revision guide summarizes the core concepts, essential graphs, and proven exam tips to help you tackle both multiple-choice and free-response questions with confidence.

AP宏观经济学考察你对整体经济运行方式的理解，涵盖从衡量国民产出到制定财政与货币政策。本篇复习指南总结了核心概念、必会图表以及高效的应试技巧，帮助你自信应对选择题和自由作答题。

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1. Basic Economic Concepts | 基本经济概念

Scarcity forces individuals and societies to make choices, leading to opportunity cost — the value of the next best alternative forgone.

稀缺性迫使个人和社会做出选择，由此产生机会成本——即所放弃的次优选择的价值。

The production possibilities curve (PPC) illustrates trade-offs, efficiency, and economic growth. Points inside the curve represent unemployment or inefficient use of resources; points outside are unattainable with current resources and technology.

生产可能性曲线（PPC）说明了权衡取舍、效率及经济增长。曲线内部的点代表失业或资源利用无效率；线外的点在当前资源与技术下无法实现。

An outward shift of the PPC indicates economic growth, caused by an increase in resources or technological advances. Inward shifts occur when resources are destroyed.

PPC向外移动表示经济增长，由资源增加或技术进步引起；资源被破坏时则向内移动。

Positive economics relies on testable, objective statements, whereas normative economics involves subjective value judgments about what ought to be.

实证经济学基于可检验的客观陈述，而规范经济学涉及关于“应该怎样”的主观价值判断。

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2. Supply and Demand Fundamentals | 供需基础

The demand curve slopes downward: as price falls, quantity demanded rises. The supply curve slopes upward: as price rises, quantity supplied increases.

需求曲线向下倾斜：价格下降，需求量增加。供给曲线向上倾斜：价格上升，供给量增加。

Market equilibrium occurs at the intersection of supply and demand. Changes in determinants — such as income, tastes, or production costs — shift the curves and lead to a new equilibrium price and quantity.

市场均衡形成于供求曲线的交点。决定因素（如收入、偏好或生产成本）的变化会使曲线移动，并形成新的均衡价格与数量。

Price ceilings set below equilibrium create persistent shortages; price floors set above equilibrium generate surpluses.

价格上限设定在均衡价格之下会造成持续短缺；价格下限设在均衡价格之上会产生过剩。

These foundational microeconomic mechanisms are embedded in aggregate models and help explain resource allocation at the macro level.

这些基础微观机制嵌入在总量模型中，有助于解释宏观层面的资源配置。

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3. Measuring Economic Performance | 经济表现的衡量

Gross Domestic Product (GDP) captures the market value of all final goods and services produced within a country in a given year. Using the expenditure approach: GDP = C + I + G + (X − M).

国内生产总值（GDP）衡量一国在给定年份内生产的所有最终商品和服务的市场价值。按支出法计算：GDP = C + I + G + (X − M)。

Nominal GDP measures output at current prices, while real GDP adjusts for inflation, revealing true changes in production. The GDP deflator helps convert nominal to real values.

名义GDP用当前价格衡量产出，而实际GDP剔除通胀影响，反映真实的产量变化。GDP平减指数用于将名义值转换为实际值。

The unemployment rate equals the number of unemployed actively looking for work divided by the labor force. Economists distinguish frictional, structural, and cyclical unemployment. Full employment occurs when cyclical unemployment is zero.

失业率等于积极寻找工作的失业人数除以劳动力总数。经济学家区分摩擦性失业、结构性失业和周期性失业。周期性失业为零时达到充分就业。

Inflation is a sustained rise in the general price level. The Consumer Price Index (CPI) compares the cost of a fixed basket of goods over time. Inflation rate = (CPI this year − CPI last year) / CPI last year × 100.

通货膨胀是指一般物价水平持续上涨。消费者价格指数（CPI）比较固定一篮子商品在不同时间的成本。通胀率 = (今年CPI − 去年CPI) / 去年CPI × 100。

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4. Aggregate Demand and Aggregate Supply | 总需求与总供给

The aggregate demand (AD) curve shows the total quantity of goods and services demanded at each price level. It slopes downward due to the wealth effect, interest rate effect, and international trade effect.

总需求（AD）曲线表示在每个价格水平下对商品与服务的总需求量。由于财富效应、利率效应和国际贸易效应，该曲线向下倾斜。

Short-run aggregate supply (SRAS) slopes upward because nominal wages and some input prices are sticky. The long-run aggregate supply (LRAS) curve is vertical at the full-employment level of output, representing the economy’s potential GDP.

短期总供给（SRAS）曲线向上倾斜，因为名义工资和部分投入价格具有粘性。长期总供给（LRAS）曲线在充分就业产出水平处垂直，代表经济体的潜在GDP。

AD shifts with changes in consumption, investment, government purchases, or net exports. SRAS shifts with changes in input costs, productivity, or supply shocks. LRAS shifts rightward with increases in resources, technology, or institutional quality.

AD随消费、投资、政府购买或净出口的变化而移动。SRAS随投入成本、生产率或供给冲击而变化。LRAS随着资源、技术或制度质量的提升而右移。

In the AD-AS model, short-run equilibrium occurs where AD intersects SRAS; the long-run adjustment process moves the economy toward the LRAS curve through changes in nominal wages and prices.

在AD-AS模型中，短期均衡位于AD与SRAS的交点；长期调整过程通过名义工资和价格的变化使经济趋向LRAS曲线。

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5. Fiscal Policy and the Multiplier | 财政政策与乘数

Fiscal policy involves changes in government spending (G) and taxes (T) to influence aggregate demand. Expansionary fiscal policy (increase G, decrease T) shifts AD right; contractionary fiscal policy shifts AD left.

财政政策通过改变政府支出（G）和税收（T）来影响总需求。扩张性财政政策（增加G、减少T）使AD右移；紧缩性财政政策使AD左移。

Spending Multiplier = 1 / (1 − MPC) = 1 / MPS

支出乘数 = 1 / (1 − MPC) = 1 / MPS

A change in spending has a multiplied impact on real GDP. The tax multiplier is smaller in absolute value: −MPC / (1 − MPC).

支出的变动对实际GDP产生成倍的影响。税收乘数的绝对值较小：−MPC / (1 − MPC)。

Automatic stabilizers — such as progressive income taxes and unemployment benefits — automatically reduce the amplitude of business cycles without discretionary policy.

自动稳定器——如累进所得税和失业救济金——无需斟酌性政策便可自动减小经济周期波动的幅度。

Crowding out occurs when deficit-financed government spending raises interest rates, reducing private investment and partially offsetting the initial expansion.

当赤字融资的政府支出推高利率、减少私人投资，并部分抵消最初的扩张时，便会产生挤出效应。

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6. Money, Banking, and Monetary Policy | 货币、银行与货币政策

Money functions as a medium of exchange, unit of account, and store of value. The M1 measure includes currency and checkable deposits; M2 adds savings deposits, money market funds, and other near-monies.

货币具有交易媒介、计价单位和价值储藏三大职能。M1包含通货和活期存款；M2则加入储蓄存款、货币市场基金等准货币。

Fractional reserve banking enables banks to lend out a portion of deposits, creating money through the deposit expansion process. The simple deposit multiplier is 1 / reserve requirement ratio.

部分准备金银行制度使银行可以贷出部分存款，通过存款扩张过程创造货币。简单存款乘数为 1 / 准备金率。

The central bank (the Federal Reserve) uses open market operations, the discount rate, and reserve requirements to influence the money supply and interest rates. Buying government securities injects reserves and lowers the federal funds rate (expansionary); selling securities does the reverse.

中央银行（美联储）通过公开市场操作、贴现率和准备金要求来影响货币供给与利率。买入政府证券注入准备金并降低联邦基金利率（扩张性）；卖出证券则作用相反。

The quantity theory of money: MV = PY, where M is money supply, V is velocity, P is price level, and Y is real GDP. If V is stable, growth in the money supply leads to proportionate inflation in the long run.

货币数量论：MV = PY，其中 M 为货币供给，V 为流通速度，P 为价格水平，Y 为实际GDP。若 V 稳定，长期内货币供给的增长将导致等

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