为什么随机对照实验（RCT）被视为政策评估的“金标准”？它有哪些局限？
Why are randomized controlled trials (RCTs) considered the “gold standard” of policy evaluation, and what are their limits?
RCT通过随机分配“接受政策”与“对照组”，使两组在平均意义上除政策外无系统差异，从而干净识别因果效应，避免选择偏差。班纳吉、迪弗洛与克雷默因把RCT大规模引入扶贫评估而获诺贝尔经济学奖。但RCT有局限：外部效度问题（此地结果未必适用于他处）、样本规模与时间跨度有限、伦理约束（不能随机拒绝帮助），以及把复杂政策简化为“小项目”而忽略系统改革。因此近年强调对RCT结果做机制分析与外部效度检验，并与其他证据（自然实验、结构模型）互补。
RCTs randomly assign treatment and control groups so that, on average, groups differ only by the policy, cleanly identifying causal effects and avoiding selection bias. Banerjee, Duflo, and Kremer won the Nobel Prize partly for scaling RCTs into poverty-alleviation evaluation. But RCTs have limits: external validity (results may not travel), limited sample sizes and time horizons, ethical constraints (can't randomly deny help), and a tendency to compress complex reforms into small projects. Recent practice therefore adds mechanism analysis and external-validity checks, complementing RCTs with natural experiments and structural models.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
World Bank（《实践中的影响评估》）
World Bank (Impact Evaluation in Practice)
#RCT #因果推断 #政策评估
什么是汇率？
What is an exchange rate?
汇率是一国货币兑换另一国货币的价格，可分为固定汇率与浮动汇率制度。它影响进出口商品价格、资本流动与通货膨胀。汇率水平由市场供求、利率差异和预期等多种因素共同决定。
An exchange rate is the price of one currency in terms of another, under fixed or floating exchange rate regimes. It affects import-export prices, capital flows, and inflation. The rate is shaped by market supply and demand, interest-rate differentials, and expectations, among others.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#汇率 #货币 #国际贸易
赫伯特·西蒙的「有限理性」如何修正了「经济人」假设？
How does Herbert Simon's 'bounded rationality' revise the 'economic man' assumption?
西蒙在 1957 年指出，人受信息、时间与认知能力限制，无法算出「最优」解，只能追求「满意」的选择。有限理性推翻了完全理性、无限计算力的古典假设，成为行为经济学与组织决策的理论基石。
Simon argued in 1957 that people are constrained by information, time, and cognitive limits, so they cannot compute the optimal choice and instead 'satisfice.' Bounded rationality overthrew the classical assumption of fully rational, infinitely calculating agents and became a cornerstone of behavioral economics and organizational decision-making.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Simon，《人类模型》(1957)
Simon, 'Models of Man' (1957)
#有限理性 #满意化 #行为经济学
经济学里的「流动性陷阱」指降息到极限后货币政策为何「失灵」？
In economics, what is a 'liquidity trap,' and why do interest-rate cuts stop working in it?
流动性陷阱指利率已降到近乎零、人们仍宁愿持有现金也不愿投资消费，此时央行再「放水」也难以刺激经济。凯恩斯在 1936 年提出这一概念，后来被用于解释日本「失去的十年」与 2008 年后的低利率困境。
A liquidity trap occurs when rates are near zero yet people still hoard cash instead of spending or investing, so the central bank's easing no longer stimulates the economy. Keynes introduced it in 1936; it later explained Japan's 'lost decade' and post-2008 low-rate stagnation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Keynes，《就业、利息与货币通论》(1936)
Keynes, 'The General Theory of Employment, Interest and Money' (1936)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL38054332W：The General Theory of
#流动性陷阱 #零利率 #货币政策
为什么针对青年失业的“培训项目”效果常不如预期？哪些政策组合被证明更有效？
Why do training programs for youth unemployment often underperform, and which policy mixes have proven more effective?
随机评估发现，单纯的短期课堂式培训对青年就业效果微弱，原因在于青年失业多为“需求侧”问题（岗位不足、经验门槛）与匹配问题，而非单纯技能供给不足；且存在“替代效应”（受训者挤掉未受训者的岗位）与“锁定效应”（参与者减少求职努力）。效果较好的干预包括：工资补贴（直接降低企业雇佣青年的成本）、在职培训与学徒制（雇主参与、学用结合）、信息与求职辅导，以及针对NEET风险群体的早期密集干预。政策研究者据此主张用需求侧加工作现场培训的组合替代单纯的课堂供给。
Randomized evaluations find that short classroom-based training has weak effects on youth employment, because youth joblessness is largely a demand-side (too few jobs, experience thresholds) and matching problem rather than a pure skills-supply one; substitution effects (trainees displacing untrained workers) and lock-in effects (participants searching less) also blunt results. Interventions that fare better include wage subsidies (directly lowering employer costs of hiring youth), on-the-job training and apprenticeships (employer involvement, learn-by-doing), information and job-search counseling, and early intensive support for those at NEET risk. The policy lesson is to replace pure classroom supply with demand-side plus workplace-based packages.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
World Bank（《实践中的影响评估》）
World Bank (Impact Evaluation in Practice)
#青年就业 #培训评估 #需求侧政策
医疗保险市场为何天然存在“逆向选择”与“道德风险”？保险设计如何回应？
Why do health-insurance markets inherently suffer from adverse selection and moral hazard, and how do designs respond?
逆向选择发生在签约前：投保人更了解自身健康，高危者更愿投保，若按平均风险定价，低危者感到吃亏而退出，保费螺旋上升，市场可能萎缩甚至崩溃（“死亡螺旋”）。道德风险发生在签约后：有了保险，患者倾向多用医疗、医生倾向多开检查，推高费用。回应手段包括强制参保（扩大风险池）、社区费率（禁止按个体风险定价）、共付与免赔额（让患者承担部分成本以抑制过度消费），但共付过高又伤害穷人并减少必要诊疗，凸显公平与效率的张力。
Adverse selection occurs before purchase: applicants know their health better, the high-risk are more eager to enroll, and if priced at the average risk, the low-risk drop out, premiums spiral, and the market can shrink or collapse—a “death spiral.” Moral hazard occurs after purchase: with insurance, patients use more care and doctors order more tests, inflating costs. Responses include mandatory enrollment (broadening the risk pool), community rating (banning individual risk pricing), and copays/deductibles (sharing costs to curb overuse)—but high copays hurt the poor and reduce necessary care, highlighting the fairness-efficiency tension.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#卫生经济学 #逆向选择 #道德风险
基尼系数衡量什么？0 和 1 分别代表什么？
What does the Gini coefficient measure, and what do 0 and 1 represent?
基尼系数衡量一个地区收入分配的不平等程度，由意大利统计学家科拉多·基尼在 1912 年提出。系数为 0 表示收入完全平等（每人相同），为 1 表示收入完全集中在一人手中。
The Gini coefficient measures the inequality of income distribution in a population, introduced by Italian statistician Corrado Gini in 1912. A value of 0 means perfect equality (everyone has the same income) and 1 means perfect inequality (one person has all the income).
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
科拉多·基尼《变化率与集中指数》（Variabilità e Mutabilità, 1912）；世界银行（World Bank）发展指标
Corrado Gini, “Variabilità e Mutabilità” (1912); World Bank development indicators
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL44341519W：Variabilità e mutabili
#基尼系数 #收入不平等 #科拉多·基尼
外部性是什么？为什么自由市场有时会失灵？
What are externalities, and why do free markets sometimes fail?
外部性是一个经济主体的行为对旁观者产生的未补偿影响，如污染。当存在外部性或公共品时，自由市场可能无法达到社会最优结果。
An externality is an uncompensated impact of one actor's behavior on others, like pollution. With externalities or public goods, free markets may fail to reach socially optimal outcomes.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#外部性 #市场失灵
什么是存款准备金率？
What is the reserve requirement ratio?
存款准备金率是商业银行必须把存款的一定比例存在中央银行、不能贷出的制度。比率越高，银行可贷资金越少，货币创造能力越弱，是一种重要的货币政策工具。
The reserve requirement ratio is the share of customer deposits that commercial banks must hold at the central bank and cannot lend out. A higher ratio reduces lendable funds and the money-creation capacity, serving as a key monetary policy tool.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#存款准备金率 #中央银行 #货币政策
失业保险是否会使失业者更“挑剔”、延长失业期？如何设计才能兼顾保障与激励？
Does unemployment insurance make the unemployed pickier and prolong joblessness? How should it be designed to balance protection and incentives?
理论上，失业保险降低了求职的机会成本，会提高保留工资、延长搜索时间，这是道德风险；但搜索经济学也指出，更长时间搜索能匹配到更合适的岗位，保障收入使人不必接受糟糕的工作。实证（如利用美国各州待遇差异的研究）显示给付越长或越慷慨，失业期越长，但幅度适中；对“给付到期前求职率骤升”的研究证实了激励效应。设计上常用递减给付、严格求职义务、资格审查与在职培训来平衡；“工作共享”政策则通过缩短工时而非裁员应对冲击。
In theory, UI lowers the opportunity cost of job search, raising reservation wages and prolonging search—moral hazard; but search theory notes longer search can yield better matches, and income support keeps people from taking bad jobs. Evidence (e.g., studies exploiting state-to-state differences in the US) shows longer or more generous benefits extend unemployment duration, but moderately; research showing job-finding jumps as benefits near expiration confirms the incentive channel. Designs commonly balance protection and incentives via declining benefits, strict job-search requirements, eligibility checks, and training; “work-sharing” policies respond to shocks by reducing hours rather than layoffs.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
OECD (2019), 《就业展望 2019》, 经合组织
OECD (2019), OECD Employment Outlook 2019
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1787/9ee00155-en：OECD Employment Outlook
#失业保险 #道德风险 #求职激励
卡德与克鲁格关于最低工资的著名研究为什么颠覆了教科书预期？后续研究如何回应？
Why did Card and Krueger's famous minimum-wage study upend conventional predictions, and how did later research respond?
1992年两人利用新泽西州上调最低工资、宾夕法尼亚州不变的“自然实验”，对快餐店做双重差分比较，发现就业并未下降，与标准竞争模型预测相悖，他们归因于企业买方垄断力。该研究引发方法革命，但后续验证并存：有的重复研究支持其发现，批评者则认为其数据采集窗口过短、样本噪声大；近年美国研究（如Cengiz等）发现适度提高最低工资对整体就业影响很小，而大幅度上调会显著减少就业。共识趋于“存在阈值与条件”，说明自然实验方法严谨但结论需多重验证。
In 1992, Card and Krueger used a natural experiment—New Jersey raising its minimum wage while neighboring Pennsylvania did not—and a difference-in-differences comparison of fast-food restaurants found no employment decline, contradicting the standard competitive model; they attributed this to monopsony. The study sparked a methodological revolution, but replications split: some confirmed the findings; critics argued the sampling window was short and noisy. Recent US research (e.g., Cengiz et al.) finds modest increases have little aggregate employment effect while large increases reduce employment substantially. The consensus is now conditional and threshold-based, showing that natural experiments are rigorous but conclusions need multiple verification.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Card, D. & Krueger, A. (1994), 《最低工资与就业：快餐业案例研究》, 美国经济评论 (AER), 84(4)
Card, D. & Krueger, A. (1994), Minimum Wages and Employment: A Case Study of the Fast-Food Industry, American Economic Review, 84(4)
#最低工资 #自然实验 #双重差分
“腐败的润滑剂假说”与主流研究有何冲突？为什么腐败的代价随制度环境变化？
How does the “grease-the-wheels” hypothesis of corruption conflict with mainstream research, and why do corruption's costs vary with institutions?
早期有人主张在低效管制下，腐败能“买时间”、绕过官僚障碍，反而促进增长；但微观与跨国研究压倒性地显示相反结论：腐败降低投资率、扭曲公共支出结构（偏向有形资本而非教育健康）、抑制新企业进入与创新，且腐败者无法保证承诺，交易成本随不确定性上升。关键机制是“腐败与制度质量互补”：透明体制里小腐败成本有限，而弱制度国家中腐败侵蚀税基、司法和投资环境，形成恶性循环。因此计量上需处理双向因果——不是增长差导致腐败，而是腐败结构性拖累增长。
Some early accounts argued that under burdensome regulation, corruption can “buy time” and bypass bureaucratic obstacles, even aiding growth; but micro and cross-country studies overwhelmingly find the opposite: corruption lowers investment rates, distorts public spending toward physical capital and away from education and health, and discourages firm entry and innovation, while corrupt deals cannot guarantee commitments and transaction costs rise with uncertainty. The key mechanism is complementarity between corruption and institutions: in transparent systems petty corruption costs little, but in weak-institution states corruption erodes the tax base, courts, and investment climate in a vicious circle. Estimation must therefore address reverse causality—weak growth does not cause corruption; corruption structurally drags growth.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
World Bank（《治理与发展》等治理研究）
World Bank (Governance and Development and related governance research)
#腐败 #制度 #增长
泰勒规则为中央银行设定利率提供了怎样的公式化指引？
What formulaic guidance does the Taylor rule provide for a central bank's interest-rate setting?
泰勒规则由约翰·泰勒于 1993 年提出，建议政策利率随通胀偏离目标与产出缺口而调整，通胀越高、经济越过热，利率就应上调越多。它把货币政策操作变成可预期的规则，但也常被央行作为参考而非机械执行。
Proposed by John Taylor in 1993, the Taylor rule advises that the policy interest rate should rise with inflation above target and with a positive output gap—the more overheated the economy, the higher the rate. It turns monetary policy into a predictable rule, though central banks typically treat it as a reference rather than a rigid formula.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Taylor，《实践中的自由裁量规则》(1993)
Taylor, 'Discretion versus Policy Rules in Practice' (1993)
#泰勒规则 #货币政策 #利率
什么是信息不对称？柠檬市场指什么？
What is information asymmetry and what is the “market for lemons”?
信息不对称指交易双方掌握的信息不均等，卖方常比买方更了解商品质量。经济学家阿克洛夫用“柠檬市场”说明：当买家无法分辨好坏车，劣质车会挤走好车，市场可能失灵。
Information asymmetry means one party—often the seller—knows more about a product than the other. In “The Market for Lemons,” Akerlof showed that when buyers cannot tell good cars from bad, poor-quality “lemons” drive out good ones and the market can fail.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
曼昆《经济学原理》
Mankiw, Principles of Economics
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#信息不对称 #柠檬市场 #市场失灵
什么是货币贬值？
What is currency devaluation?
货币贬值指一国货币相对于其他货币的价值下降，同样数量的本币能换到的外币变少。它会使进口变贵、出口更便宜，从而影响贸易。
Currency devaluation means a currency's value falls relative to others, so less foreign currency is obtained per unit. It makes imports costlier and exports cheaper, affecting trade.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#汇率 #货币 #国际贸易
什么是国际收支？
What is the balance of payments?
国际收支是一国与世界其他国家和地区在一定时期内的全部经济交易记录，主要包括经常账户（货物、服务、收入和转移）与资本和金融账户。它反映一国的对外经济地位和汇率压力。
The balance of payments is a record of all economic transactions between a country and the rest of the world over a period, mainly the current account (goods, services, income, transfers) and the capital and financial account. It reflects external position and exchange-rate pressure.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
国际货币基金组织（IMF）《国际金融统计》；曼昆《经济学原理》
International Monetary Fund (IMF), “International Financial Statistics”; Mankiw, “Principles of Economics”
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL28725849W：International Financia
#国际收支 #经常账户 #资本账户
什么是菲利普斯曲线？
What is the Phillips curve?
菲利普斯曲线最初描述失业率与货币工资增长率之间的反向关系，后来被扩展为失业与通货膨胀之间的权衡。在短期，适度的通胀可能伴随较低失业；但在长期，这种权衡往往消失。该曲线是现代宏观政策讨论的重要参考框架。
The Phillips curve originally described an inverse relationship between unemployment and wage inflation, later extended to a trade-off between unemployment and price inflation. In the short run, lower unemployment may come with higher inflation, but this trade-off tends to vanish in the long run. It remains a key framework in macroeconomic policy debate.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#菲利普斯曲线 #失业 #通胀
比较优势和绝对优势有什么不同？
How do comparative and absolute advantage differ?
绝对优势指以更少资源生产某商品的能力；比较优势指生产该商品的机会成本更低。即使一国在所有产品上都有绝对优势，贸易仍能通过比较优势使各方互利。
Absolute advantage means producing with fewer inputs; comparative advantage means producing at lower opportunity cost. Even if one country has absolute advantage in everything, trade still benefits all via comparative advantage.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#比较优势 #国际贸易
为什么“合成谬误”在宏观经济学中很重要？
Why is the “fallacy of composition” important in macroeconomics?
合成谬误指认为对个体成立的事对整体也成立的错误推理，例如每个人都储蓄更多在个人层面是谨慎的，但全社会同时增加储蓄会减少总需求、反而降低整体收入（即“节俭悖论”）。凯恩斯在《通论》中突出这一区别，以论证总需求管理的必要性。
The fallacy of composition is the error of assuming what is true of a part is true of the whole—for instance, while saving more is prudent for one person, if everyone saves at once aggregate demand falls and total income drops (the “paradox of thrift”). Keynes stressed this distinction to justify managing aggregate demand.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
凯恩斯《就业、利息和货币通论》（1936）；萨缪尔森《经济学》
Keynes, “The General Theory” (1936); Samuelson, “Economics”
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787100103565（豆瓣书目条目: 经济学）；本条出处含多部著作，此标识只担保上面点名的这部
#合成谬误 #节俭悖论 #宏观经济学
为什么有的国家比别的国家更富有？
Why are some countries wealthier than others?
国家贫富差距主要来自制度、地理与历史因素的组合。保护产权、法治和有效率的市场制度能激励生产与投资；地理位置（气候、海岸线、资源）影响贸易与农业；教育、技术和人力资本决定生产力；殖民历史、战争与政策选择也留下长期影响。没有单一原因，而是多种因素叠加。
Differences in national wealth come from a mix of institutions, geography, and history. Institutions that protect property rights, enforce the rule of law, and support efficient markets encourage production and investment; geography (climate, coastlines, resources) shapes trade and agriculture; education, technology, and human capital set productivity; and colonial history, war, and policy choices leave long-lasting marks. No single cause explains it—factors stack up.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#经济发展 #贫富差距 #制度
库兹涅茨曲线描述了经济增长与收入不平等之间的什么关系？
What relationship between economic growth and income inequality does the Kuznets curve describe?
库兹涅茨曲线由西蒙·库兹涅茨在 1955 年提出，描述在工业化早期收入不平等会随增长而扩大，到达拐点后又逐渐缩小，呈倒 U 形。它基于美国、英国等历史数据，但对发展中国家的适用性长期存在争议。
Proposed by Simon Kuznets in 1955, the curve describes an inverted-U relationship: income inequality first rises with early industrial growth, then narrows after a turning point. Based on historical U.S. and U.K. data, its applicability to developing countries remains debated.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review结论有争议 · Contested
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
库兹涅茨《经济增长与收入不平等》（Kuznets, “Economic Growth and Income Inequality”, 1955, American Economic Review）
Kuznets, “Economic Growth and Income Inequality,” American Economic Review (1955)
#库兹涅茨曲线 #收入不平等 #倒U形
边际效用递减规律说明了什么？
What does the law of diminishing marginal utility explain?
随着消费单位增加，每新增一单位带来的满足感逐渐下降，这解释了需求曲线向下倾斜以及人们偏好多样化的消费行为。
As consumption increases, each additional unit yields less satisfaction, which helps explain downward-sloping demand and the preference for variety.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#边际效用 #消费者行为
什么是贸易逆差？
What is a trade deficit?
贸易逆差指一个国家从国外进口的商品和服务总值，大于它出口到国外的总值。长期逆差可能带来外债，但也可能反映国内消费旺盛。
A trade deficit occurs when a country imports more goods and services than it exports. Persistent deficits can build foreign debt but may also reflect strong domestic demand.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3361621W：Principles of Economics
#贸易 #进出口 #逆差
各国医保制度大体有哪些类型？“单一支付者”与商业保险主导有何不同后果？
What are the main types of health systems, and how do single-payer and private-insurance-dominated models differ in outcomes?
大体分三类：全民政府型（英国NHS，税收直接筹资、国家提供）、社会保险型（德国/日本，雇主雇员缴费、公共基金、多元提供者）、商业保险主导型（美国以雇主保险为主、Medicare/Medicaid为补充）。单一支付者模式行政成本低、覆盖面广、药品价格谈判能力强，但可能有等待时间和创新激励问题；商业保险主导模式选择多、创新快，但行政成本高、未投保人群风险大。OECD数据显示美国人均医疗支出远高于他国，而多项健康指标并不占优——说明“花更多钱不等于更好的健康”。
Systems fall roughly into three types: national health service (UK NHS, tax-funded, state-provided), social insurance (Germany/Japan, employer-employee contributions, public funds, plural providers), and private-insurance-dominant (US employer insurance with Medicare/Medicaid). Single-payer models have low administrative costs, broad coverage, and strong drug-price negotiation, but can face waiting times and weaker innovation incentives; private-insurance models offer choice and fast innovation but high administrative costs and uninsured risk. OECD data show the US spends far more per capita than peers without superior health outcomes—spending more is not the same as being healthier.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
OECD（《健康一览》）
OECD (Health at a Glance)
#医保 #单一支付者 #健康保险
什么是滞胀？
What is stagflation?
滞胀指经济停滞（增长缓慢、失业高）与通货膨胀同时出现的反常组合。20世纪70年代的石油危机使许多国家陷入滞胀，使传统货币政策进退两难。
Stagflation is the unusual combination of economic stagnation (slow growth, high unemployment) with inflation. The 1970s oil crises pushed many countries into stagflation, leaving conventional monetary policy in a dilemma.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#滞胀 #通货膨胀 #失业
什么是 GDP？
What is GDP?
GDP 是国内生产总值的缩写，指一个国家在一段时间内生产的所有最终商品和服务的总价值，常用来衡量经济规模。
GDP stands for Gross Domestic Product, the total market value of all final goods and services produced within a country over a period. It is a common measure of economic size.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#GDP #国民经济 #统计
贸易逆差是否一定意味着“本国吃亏”？为什么？
Does a trade deficit necessarily mean the country is “losing”? Why or why not?
贸易逆差意味着一国进口多于出口，其反面是资本净流入：外国人持有该国资产，或该国借款消费，因此贸易余额与储蓄-投资缺口是一体两面。逆差国当下获得更多商品与服务，但资产转移到了外国；是否“吃亏”取决于资金用途——若投向高回报项目而非纯消费，未来仍可偿债。经济学家普遍认为贸易本身是双赢，逆差并非简单的好坏标志。
A trade deficit means a country imports more than it exports; the mirror image is net capital inflows—foreigners hold its assets, or it borrows to consume, so the trade balance and the savings-investment gap are two sides of the same coin. The deficit country gets more goods and services now but transfers assets abroad; whether it is “losing” depends on how borrowed funds are used—if for high-return investment rather than consumption, debts remain serviceable. Economists generally view trade itself as mutually beneficial, so a deficit is not a simple good-or-bad signal.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
IMF（《金融与发展》·“贸易逆差”专题）
IMF (Finance & Development, “Trade Deficits”)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787308076173（豆瓣书目条目: 金融与发展）
#贸易逆差 #资本流动 #储蓄-投资缺口
凯恩斯的《就业、利息和货币通论》对政府干预经济提出了什么核心观点？
What core argument did Keynes make in “The General Theory of Employment, Interest and Money” regarding government intervention?
凯恩斯在 1936 年提出，当私人需求不足导致失业时，政府应通过财政赤字支出和公共投资来刺激总需求，从而恢复充分就业。这一思想奠定了现代宏观经济学和“需求管理”政策的基础。
In 1936 Keynes argued that when private demand is insufficient and causes unemployment, governments should use deficit spending and public investment to stimulate aggregate demand and restore full employment. This idea founded modern macroeconomics and the policy of “demand management.”
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
约翰·梅纳德·凯恩斯《就业、利息和货币通论》（1936）
John Maynard Keynes, “The General Theory of Employment, Interest and Money” (1936)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL38054332W：The General Theory of
#凯恩斯 #宏观经济 #需求管理
失业有哪几种主要类型？
What are the main types of unemployment?
摩擦性（换工作过渡期）、结构性（技能与岗位不匹配）和周期性（总需求不足）是三类主要失业。
Frictional (job transitions), structural (skill mismatches), and cyclical (insufficient demand) are the three main types of unemployment.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#失业 #劳动力市场
为什么青年失业率通常高于整体失业率？“NEET”指什么？
Why is youth unemployment usually higher than overall unemployment, and what does “NEET” mean?
青年缺少经验、工作频繁更替（摩擦高），且经济下行时雇主优先裁减“后来者”，故青年失业率普遍约为整体失业率的两倍。NEET指“既未就业也未接受教育或培训”的年轻人，即使经济回暖也可能长期边缘化。OECD研究显示NEET比例高的国家面临技能流失、收入损失和社会疏离风险，因此各国把降低NEET、强化职教与学徒制作为青年政策重点。
Youth lack experience, change jobs frequently (high frictional turnover), and in downturns employers let go the most recently hired first, so youth unemployment typically runs about twice the overall rate. NEET refers to young people “not in employment, education, or training,” who risk long-term marginalization even after recovery. OECD research shows high-NEET countries face skills loss, earnings damage, and social detachment, so reducing NEETs and strengthening vocational education and apprenticeships are key policy priorities.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#青年就业 #NEET #职业教育
什么是“比较优势”理论？由谁提出？
What is the theory of “comparative advantage,” and who proposed it?
比较优势理论由大卫·李嘉图在 1817 年《政治经济学及赋税原理》中提出，认为即使一国在所有商品上都不具绝对优势，只要专注生产机会成本较低的商品并贸易，双方仍能获益。它是现代国际贸易理论的基石。
The theory of comparative advantage, proposed by David Ricardo in 1817 (“On the Principles of Political Economy and Taxation”), holds that even if a country has no absolute advantage, both sides gain by specializing in goods with lower opportunity cost and trading. It is the foundation of modern international trade theory.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
大卫·李嘉图《政治经济学及赋税原理》（1817）
David Ricardo, “On the Principles of Political Economy and Taxation” (1817)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL27900305W：On the Principles of P
#比较优势 #大卫·李嘉图 #国际贸易
购买力平价理论如何解释不同国家货币的「合理」汇率？
How does purchasing power parity explain a 'fair' exchange rate between currencies?
购买力平价认为，同样的商品篮子在各国的价格经汇率折算后应趋于一致，因此汇率会向两国物价水平之比靠拢。古斯塔夫·卡塞尔在 1918 年系统阐述该理论，国际货币基金组织也据此构建可比的「实际」汇率指标。
Purchasing power parity holds that a basket of goods should cost the same everywhere once prices are converted at the exchange rate, so the rate gravitates toward the ratio of the two countries' price levels. Gustav Cassel formalized it in 1918, and the IMF still builds comparable 'real' exchange-rate measures on the idea.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Cassel，《国际汇兑的异常偏差》(1918)；国际货币基金组织
Cassel, 'Abnormal Deviations in International Exchanges' (1918); IMF
#购买力平价 #汇率 #物价水平
什么是价格弹性？
What is price elasticity?
价格弹性衡量需求量对价格变动的敏感程度。弹性大说明小幅涨价会导致需求大幅下降（如奢侈品），弹性小说明价格变化对需求影响有限（如食盐、必需药品）。
Price elasticity measures how sensitive demand is to price changes. High elasticity means a small price rise sharply cuts demand (e.g., luxury goods); low elasticity means demand barely moves (e.g., salt, essential medicine).
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#价格弹性 #需求 #奢侈品
什么是供需关系？
What is supply and demand?
供给是生产者愿意卖出的数量，需求是消费者愿意购买的数量。两者相遇的平衡点决定了价格和交易量。
Supply is how much producers want to sell, demand is how much consumers want to buy. Their intersection determines the price and quantity traded.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#供给 #需求 #均衡
什么是比较优势？
What is comparative advantage?
比较优势是指一方在生产某种商品时相对成本低于另一方，即使它并非在所有方面都更高效。根据大卫·李嘉图的贸易理论，各国专注生产具有比较优势的产品并相互贸易，能使整体产出增加。这一原理是国际贸易分工的重要理论基础。
Comparative advantage means one party can produce a good at a lower opportunity cost than another, even if it is not absolutely more efficient at everything. David Ricardo's trade theory shows that when countries specialize in their comparative advantages and trade, total output can increase. This principle underlies the division of labor in international trade.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#比较优势 #国际贸易 #分工
经济学家为什么把犯罪也纳入“理性选择”的分析框架？
Why do economists analyze crime within a rational-choice framework?
贝克尔提出，是否犯罪取决于犯罪的期望收益与期望成本（被抓获概率×惩罚）的比较，而不只是道德缺陷。因此提高破案率、增加合法收入机会、减少犯罪机会（如目标强化）都能降低犯罪。这并不假定犯罪者都冷静计算，而是强调行为对激励有系统性反应——这一假设已被大量实证支持。
Gary Becker proposed that whether someone commits crime depends on comparing expected benefits to expected costs (probability of capture times punishment), not merely on moral failings. Raising detection rates, improving legal income opportunities, and reducing criminal opportunities (target hardening) therefore lower crime. This does not assume offenders calmly calculate; it asserts that behavior responds systematically to incentives—an assumption with substantial empirical support.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《经济学原理》(曼昆) 第1章
Principles of Economics (Mankiw), ch. 1
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#犯罪 #理性选择 #贝克尔
贸易逆差与贸易顺差有什么区别？
What is the difference between a trade deficit and a trade surplus?
贸易逆差指一国进口额大于出口额，意味着对外净支出；贸易顺差则相反，出口大于进口。长期巨额逆差可能加重外债，长期大额顺差则可能积累外汇储备并引发贸易摩擦。
A trade deficit occurs when a country imports more than it exports, implying a net outflow of funds; a trade surplus is the opposite. Persistent large deficits can raise external debt, while large surpluses build foreign reserves and may spark trade tensions.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
IMF（《金融与发展》·“贸易逆差”专题）
IMF (Finance & Development, “Trade Deficits”)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787308076173（豆瓣书目条目: 金融与发展）
#贸易逆差 #贸易顺差 #国际贸易
政府在做公共项目决策时，成本效益分析的基本逻辑是什么？
What is the basic logic of cost-benefit analysis in public project decisions?
成本效益分析把所有可货币化的收益（如节省的时间、挽救的生命、改善的健康）加总，减去包括机会成本在内的全部成本，比较净现值并给项目排序。困难在于为生命、环境、时间定价，以及贴现率的选择会显著影响长期项目结论。它帮助决策者识别投入产出比更高的方案，避免决策被个别受益群体的声音主导。
Cost-benefit analysis sums all monetizable benefits (time saved, lives saved, health gains) minus all costs including opportunity costs, compares net present values, and ranks projects. Difficulties include valuing life, the environment, and time, and choosing a discount rate that heavily affects long-term projects. It helps decision-makers identify higher-value uses of public funds rather than being swayed by vocal interest groups.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
David,《Benefit-Cost Analysis in State and Local Investment Decisions》,Public Administration Review,1979 (DOI: 10.2307/3110373)
David, 'Benefit-Cost Analysis in State and Local Investment Decisions', Public Administration Review, 1979, DOI: 10.2307/3110373
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.2307/3110373
#成本效益分析 #公共政策 #贴现
复利为什么被称为“世界第八大奇迹”？
Why is compound interest called the “eighth wonder of the world”?
复利是指利息不仅计入本金生息，还会对之前产生的利息再计息，使财富随时间呈指数增长。其威力在长期坚持的投资中尤为显著，因而常被夸张地赞誉为“奇迹”。
Compound interest means interest is earned not only on the principal but also on previously accrued interest, so wealth grows exponentially over time. The effect is especially powerful in long-term investing, which is why it is often praised hyperbolically as a “wonder.”
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
美国消费者金融保护局（CFPB）
U.S. Consumer Financial Protection Bureau (CFPB)
#复利 #利息 #长期投资
什么是“看不见的手”？它在经济学中说明了什么？
What is the “invisible hand,” and what does it explain in economics?
“看不见的手”是亚当·斯密用来描述个人在追求自身利益时，往往会无意中促进社会整体福利的机制。这一思想出自他 1776 年的《国富论》，成为自由市场理论的核心隐喻。
The “invisible hand” is Adam Smith’s metaphor for the mechanism by which individuals pursuing their own self-interest unintentionally promote the welfare of society as a whole. It appears in his 1776 “The Wealth of Nations” and became a cornerstone of free-market theory.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
亚当·斯密《国富论》（The Wealth of Nations, 1776）
Adam Smith, “The Wealth of Nations” (1776)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL76827W：The Wealth of Nations（首版
#看不见的手 #亚当·斯密 #自由市场
通货膨胀通常如何衡量？
How is inflation usually measured?
通常通过消费者价格指数（CPI）或GDP平减指数的同比变化来衡量，反映一篮子商品与服务价格的总体上涨。
Inflation is commonly measured by the year-on-year change in the Consumer Price Index (CPI) or the GDP deflator, capturing the broad rise in prices of a basket of goods and services.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#通货膨胀 #CPI
平台经济下的“零工”就业与传统雇佣关系有哪些关键差异？
What are the key differences between gig work in the platform economy and traditional employment?
零工劳动者通常按单计酬、自备工具、自主安排工作时间，平台多以“独立承包商”而非“雇员”身份对待他们，因而往往不享有最低工资、带薪休假、工伤保险等劳动保护，也难以集体协商。好处是进入门槛低、时间灵活，但伴随收入波动、社会保障缺失和算法管理不透明等问题。
Gig workers are usually paid per task, supply their own tools, and set their own hours; platforms typically classify them as “independent contractors” rather than employees, so they often lack minimum-wage protection, paid leave, and occupational-injury insurance, and can struggle to bargain collectively. Benefits include low entry barriers and flexible schedules, but gig work also brings income volatility, weak social protection, and opaque algorithmic management.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
OECD（《就业展望2021》·平台经济章节）
OECD (Employment Outlook 2021, platform economy chapter)
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1787/5a700c4b-en：OECD Employment Outlook
#零工经济 #平台就业 #劳动保护
什么是货币政策与财政政策？
What are monetary policy and fiscal policy?
货币政策由中央银行制定，通过调整利率和货币供应量来影响经济；财政政策由政府制定，通过改变税收和支出来调节经济。两者都可用来刺激或冷却经济，但作用渠道不同。配合得当的政策组合有助于稳定物价与促进就业。
Monetary policy is set by a central bank and works through interest rates and the money supply, while fiscal policy is set by government and works through taxes and spending. Both can stimulate or cool an economy, but through different channels. A well-coordinated mix helps stabilize prices and promote employment.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#货币政策 #财政政策 #宏观调控
为什么经济学家把教育和培训视为“投资”而非纯粹的消费？
Why do economists treat education and training as “investment” rather than mere consumption?
教育会带来未来更高的收入流，其成本（学费与放弃的工资）发生在当下，收益延后兑现，本质上是用今天的成本换取未来的回报，与资本投资逻辑一致，故称“人力资本投资”。回报率大致等于教育带来的额外终身收入除以投入成本。也正因如此，人力资本与实物资本一样会折旧、需要维护与补充。
Education yields higher future earnings: costs (tuition and forgone wages) are paid today while returns arrive later—essentially trading present costs for future returns, the same logic as capital investment, hence “human capital investment.” Its rate of return is roughly the extra lifetime income from education divided by its cost. Like physical capital, human capital depreciates and needs maintenance and renewal.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《经济学原理》(曼昆) 第19章
Principles of Economics (Mankiw), ch. 19
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#人力资本 #教育回报 #投资
为什么商品价格会波动？
Why do prices of goods fluctuate?
商品价格由供给和需求共同决定。当某种商品稀缺而想要的人多时价格上升，供给充足而需求减少时价格下降。
Prices are set by supply and demand. When a good is scarce but many people want it, the price rises; when supply is plentiful and demand falls, the price drops.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#供需 #价格 #市场
为什么社会上会有失业？
Why does unemployment exist?
失业可能来自经济衰退、技术替代人工、工人技能与岗位不匹配，或人们正在换工作之间的空档。完全零失业在现实中很难做到。
Unemployment arises from recessions, technology replacing workers, skills mismatched with jobs, or the gap between leaving and finding work. Zero unemployment is hard to achieve in practice.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#失业 #劳动力市场 #经济
经济学家如何估算“多读一年书的回报率”？
How do economists estimate the “returns to an extra year of schooling”?
常用方法是明瑟收入方程：比较不同受教育年限者的收入，把教育年限作为解释变量估计系数，得出每多读一年带来的收入增幅，发达国家一般在6%-10%。但存在“能力偏差”——更聪明、更有毅力的人本就收入更高，简单回归会高估教育的作用，因此研究者用出生季节、义务教育法变动、双胞胎等自然实验来控制混淆因素。
A common method is the Mincer earnings equation: comparing income across education levels and estimating the coefficient on schooling years—the extra earnings per added year, typically around 6-10% in developed countries. But ability bias means smarter, more persistent people would earn more anyway, so simple regressions overstate education's causal effect; researchers therefore use natural experiments such as birth quarter, compulsory-schooling-law changes, or twins to control for confounding.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
乔舒亚·安格里斯特与约恩-斯特芬·皮施克《可信性革命：计量经济学的经验方法》(2010) ; 另见: Joshua D. Angrist and Jörn-Steffen Pischke, Mostly Harmless Econometrics (2009) / The Credibility Revolution (2010)
Joshua D. Angrist and Jörn-Steffen Pischke, Mostly Harmless Econometrics (2009) / The Credibility Revolution (2010) ; see also: 乔舒亚·安格里斯特与约恩-斯特芬·皮施克《可信性革命：计量经济学的经验方法》(2010)
#教育回报率 #明瑟方程 #因果识别
什么是预算赤字与国家债务？
What are a budget deficit and national debt?
预算赤字是政府一年内支出超过收入的部分；国家债务则是历年赤字累积未还的余额。适度的赤字可刺激经济，但长期过高会增加利息负担并削弱财政可持续性。
A budget deficit is the gap when a government's annual spending exceeds its revenue; national debt is the accumulated sum of past deficits. Moderate deficits can stimulate the economy, but persistently high debt raises interest costs and weakens fiscal sustainability.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#预算赤字 #国家债务 #财政
什么是国内生产总值（GDP）？
What is Gross Domestic Product (GDP)?
GDP 是一个国家（或地区）在一定时期内生产的所有最终商品和服务的总市场价值，是衡量经济规模的核心指标。它可以通过生产法、收入法和支出法三种方式核算。GDP 增长常被用作经济景气程度的参考，但它并不反映收入分配或环境质量。
GDP is the total market value of all final goods and services produced within a country or region over a period, and is a core measure of economic size. It can be calculated by the production, income, or expenditure approach. While GDP growth is used as a gauge of economic activity, it does not capture income distribution or environmental quality.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#GDP #国民经济核算 #经济增长
经济学家对提高最低工资是否减少就业存在分歧，争论的核心是什么？
Economists disagree about whether raising the minimum wage reduces employment—what is the core of the debate?
标准供求模型预测，高于均衡水平的最低工资会减少劳动需求、降低就业，尤其影响低技能青少年；但现实中企业可能有买方垄断力，工资提高反而可降低离职率、提升效率。实证结果不一，学界对净就业效应的大小尚无共识，主流立场承认存在潜在权衡，而非简单断言好坏。
The standard supply-and-demand model predicts that a minimum wage above equilibrium lowers labor demand and employment, especially among low-skilled teens; but in practice firms may have monopsony power, and higher pay can cut turnover and raise productivity. Empirical results differ, so there is no consensus on the net employment effect, and mainstream economics sees a genuine trade-off rather than a simple verdict.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《经济学原理》(曼昆) 第6章
Principles of Economics (Mankiw), ch. 6
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#最低工资 #就业 #买方垄断
什么是“机会成本”？请举例说明。
What is “opportunity cost”? Give an example.
机会成本是指为了得到某种东西而放弃的其他选择中价值最高的那个。例如，用一小时去兼职赚钱，就放弃了用这一小时休息或学习所能带来的价值。
Opportunity cost is the value of the next-best alternative that is forgone to obtain something. For example, spending an hour doing part-time work means giving up the value of resting or studying during that hour.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
曼昆《经济学原理》（Mankiw, Principles of Economics）；奥地利学派维塞尔提出概念
Mankiw, “Principles of Economics”; concept introduced by Friedrich von Wieser
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3361621W：Principles of Economics
#机会成本 #微观经济学 #选择成本
什么是经济周期？
What is a business cycle?
经济周期是指整体经济活动围绕长期增长趋势出现的扩张与收缩交替波动，通常分为繁荣、衰退、萧条、复苏四个阶段。它由投资、消费、技术创新和政策等多因素共同作用形成。
The business cycle is the alternating expansion and contraction of overall economic activity around its long-term growth trend, usually described as boom, recession, downturn, and recovery. It results from interacting forces such as investment, consumption, technology, and policy.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#经济周期 #繁荣 #衰退
洛伦兹曲线和基尼系数怎样一起衡量收入不平等？
How do the Lorenz curve and the Gini coefficient work together to measure income inequality?
洛伦兹曲线由马克斯·洛伦兹于 1905 年提出，横轴为人口累计比例、纵轴为收入累计比例；曲线越偏离对角线，分配越不均。基尼系数就是该曲线与对角线之间面积占三角总面积的比例，0 表示绝对平等、1 表示绝对集中。
Introduced by Max Lorenz in 1905, the Lorenz curve plots cumulative population share against cumulative income share; the more it bows from the diagonal, the more unequal the distribution. The Gini coefficient is the area between that curve and the diagonal as a share of the whole triangle, where 0 means perfect equality and 1 means total concentration.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Lorenz，《财富集中测度方法》(1905)
Lorenz, 'Methods of Measuring the Concentration of Wealth' (1905)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 jstor-2276207：Methods of Measuring the Concen
#洛伦兹曲线 #基尼系数 #收入不平等
在完全竞争的劳动力市场上，决定一个工人工资水平的最根本经济因素是什么？
In a perfectly competitive labor market, what is the most fundamental economic factor determining a worker's wage level?
工资大体由工人的边际产量价值决定，即企业多雇用一名工人所带来的额外收入。若工人创造的价值高于工资，企业会增雇；反之则减雇，市场会在两者相等处出清。因此教育、技能与经验能提升生产率，从而抬高工资。
Wages tend to equal the value of the marginal product (VMP)—the extra revenue a firm earns from hiring one more worker. If a worker adds more value than their wage, firms hire more; if less, they hire fewer, until the two balance. Education, skills, and experience raise productivity and therefore wages.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《经济学原理》(曼昆) 第18章
Principles of Economics (Mankiw), ch. 18
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#劳动力市场 #工资决定 #边际生产率
什么是垄断？
What is a monopoly?
垄断是指单一卖者控制整个市场、缺乏相近替代品的情形，使该卖者拥有较强的定价能力。它可能抬高价格、降低产量并抑制创新。反垄断法通常用来限制滥用市场支配地位。
A monopoly is a market with a single seller controlling the whole market and few close substitutes, giving that seller strong pricing power. It may raise prices, cut output, and dampen innovation. Antitrust law typically limits abuse of dominant market position.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#垄断 #市场结构 #反垄断
什么是沉没成本？为什么不该被它左右？
What is a sunk cost and why should it not affect decisions?
沉没成本是指已经发生、无法收回的支出，比如已买的电影票。理性决策只看未来成本与收益，不应因为“已经花了钱”就继续投入，这就是“沉没成本谬误”。
A sunk cost is money already spent and unrecoverable, like a bought movie ticket. Rational decisions weigh only future costs and benefits, not past spending—ignoring this is the “sunk cost fallacy.”
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
曼昆《经济学原理》
Mankiw, Principles of Economics
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#沉没成本 #决策 #谬误
什么是消费者剩余？
What is consumer surplus?
消费者剩余是消费者愿意支付的最高价格与实际支付价格之间的差额之和，反映购买带来的额外满足。它是衡量市场福利与政策影响（如征税）的重要指标。
Consumer surplus is the sum of differences between what consumers are willing to pay and what they actually pay, capturing the extra satisfaction from purchases. It is key to measuring market welfare and policy effects like taxation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#消费者剩余 #福利 #需求
为什么同样技能水平的工人，从事危险或艰苦工作的工资往往更高？
Why do workers with similar skills earn more in dangerous or unpleasant jobs?
这是“补偿性工资差异”：危险、脏累或声誉不佳的工作必须支付更高工资，才能吸引足够工人。工人会把非货币待遇（风险、工时、工作环境）与货币收入放在一起权衡。例如井下矿工、海上钻井工人的工资通常高于相近技能的地面工作。
This is the “compensating differential”: risky, dirty, or unpleasant jobs must pay higher wages to attract enough workers. Workers weigh non-monetary conditions (risk, hours, environment) against pay. For example, underground miners and offshore rig workers typically earn more than similarly skilled surface jobs.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《经济学原理》(曼昆) 第19章
Principles of Economics (Mankiw), ch. 19
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#劳动力市场 #补偿性工资差异 #工作风险
什么是贸易壁垒？
What is a trade barrier?
贸易壁垒是限制商品跨境自由流动的措施，分为关税（如进口税）与非关税壁垒（如配额、技术标准和补贴）。它们保护国内产业，但也会抬高消费者价格、扭曲资源配置。
A trade barrier is a measure that restricts the free cross-border flow of goods, either as a tariff (e.g., import tax) or a non-tariff barrier (quotas, technical standards, subsidies). They shield domestic industries but raise consumer prices and distort allocation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#贸易壁垒 #关税 #配额
摩擦性失业与结构性失业有何区别？
How do frictional and structural unemployment differ?
摩擦性失业是工人转换工作或初次进入劳动力市场时的短期过渡性失业，反映信息搜索与匹配需要时间，属于正常现象。结构性失业则源于技能、行业或地理位置与岗位需求的长期错配，例如自动化和产业转移使部分工人技能过时。前者常可通过改进信息匹配缓解，后者需要再培训与劳动力再配置。
Frictional unemployment is short-term unemployment from job transitions and labor-market entry, reflecting the time needed to search and match—a normal feature of a dynamic economy. Structural unemployment arises from long-term mismatches between workers' skills, industries, or locations and available jobs, such as when automation or industrial shifts make skills obsolete. The former can be eased by better information and matching, the latter requires retraining and reallocation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
《经济学原理》(曼昆) 第28章
Principles of Economics (Mankiw), ch. 28
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787301312971（豆瓣书目条目: 经济学原理）
#失业 #摩擦性失业 #结构性失业
什么是关税？关税最终由谁承担？
What is a tariff and who actually pays it?
关税是政府对进口商品征收的税，目的是增加财政收入或保护本国产业。表面上由进口商在边境缴纳，但成本往往通过更高价格转嫁给本国消费者。
A tariff is a tax a government levies on imported goods, used to raise revenue or protect domestic industries. Although importers pay it at the border, the cost is usually passed to domestic consumers through higher prices.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#关税 #进口 #贸易保护
为什么人们会把钱存起来？
Why do people save money?
人们存钱是为了以后用，比如应对生病、上学等意外开销，也为了将来买更贵的东西。就像松鼠囤坚果过冬一样。
People save to spend later, to cover unexpected costs like illness or school, and to afford bigger purchases. It is like a squirrel storing nuts for winter.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#储蓄 #消费 #未来
通货膨胀指的是什么？
What does inflation refer to?
通货膨胀是指一段时间内整体物价水平持续上涨，导致货币购买力下降的现象。通常用消费者价格指数（CPI）的年度变化率来衡量。
Inflation refers to a sustained rise in the general price level over time, which reduces the purchasing power of money. It is usually measured by the annual percentage change in the Consumer Price Index (CPI).
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
国际货币基金组织（IMF）《国际金融统计》；曼昆《经济学原理》
International Monetary Fund (IMF), “International Financial Statistics”; Mankiw, “Principles of Economics”
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL28725849W：International Financia
#通货膨胀 #物价水平 #CPI
什么是储蓄？
What is saving?
储蓄是指收入中未用于当期消费而被保留下来的部分，可以存入银行、购买资产或持有现金。储蓄为投资和未来消费提供资金来源。适度的储蓄有助于个人应对风险，也支撑宏观投资。
Saving is the part of income not spent on current consumption and set aside, whether in banks, assets, or cash. It provides funds for investment and future consumption. Moderate saving helps individuals cope with risk and supports macroeconomic investment.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#储蓄 #消费 #投资
什么是银行？
What is a bank?
银行是依法接受存款、发放贷款并提供支付结算等服务的金融机构。它通过吸收储蓄并把资金贷给借款人，连接资金盈余方与短缺方。银行体系的安全对整个经济稳定十分重要。
A bank is a financial institution legally taking deposits, making loans, and providing payment services. By gathering savings and lending to borrowers, it connects those with surplus funds to those who need them. The safety of the banking system is crucial to overall economic stability.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#银行 #金融机构 #信贷
恩格尔定律说的是收入越高、花在吃饭上的钱占比越怎样？
What does Engel's law say about the share of spending on food as income rises?
恩格尔定律由恩斯特·恩格尔于 1857 年发现：家庭收入越高，花在食物上的钱占全部开销的比例就越低。也就是说，富裕家庭虽然吃得更好，但「吃饭」在总支出里的比重反而更小。
Discovered by Ernst Engel in 1857, Engel's law states that as a household's income rises, the fraction of spending devoted to food falls. Wealthier families eat better yet spend a smaller share of their total budget on meals.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Engel，《生产与消费关系》(1857)
Engel, 'Die Productions- und Consumptionsverhältnisse' (1857)
#恩格尔定律 #食物支出 #收入
什么是股票？股票市场起什么作用？
What are stocks and what role does the stock market play?
股票代表投资者对一家公司的部分所有权，买入股票即成为股东，可分享利润并承担风险。股票市场为企业提供融资、为投资者提供流动性与价格发现，是资本配置的重要场所。
A stock represents partial ownership of a company; buying one makes you a shareholder who shares in profits and risks. Stock markets let firms raise capital, give investors liquidity and price discovery, and help allocate capital.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
N. Gregory Mankiw,《Principles of Economics》第8版,Cengage,2017;中译《经济学原理》北京大学出版社
N. G. Mankiw, Principles of Economics, 8th ed., Cengage, 2017; Chinese ed. Peking University Press
独立核验依据 · Independent verification: 核验依据 2 cengage.com
#股票 #股东 #资本市场