📚 Positive and Normative Statements: Objective and Subjective Judgements in Economics | 实证与规范陈述：经济学中的客观与主观判断
In economics, it is essential to distinguish between statements about what is, and statements about what ought to be. This distinction forms the foundation of scientific economic analysis and helps students and policymakers separate objective facts from subjective opinions.
在经济学中，区分关于“是什么”的陈述和关于“应该是什么”的陈述至关重要。这一区分构成了科学经济分析的基础，帮助学习者和政策制定者将客观事实与主观观点分离开来。
1. Definitions and Core Concepts | 定义与核心概念
A positive statement is a factual, testable statement about how the economy works. It can be confirmed or refuted using data and evidence. For example, “An increase in the minimum wage leads to a fall in employment among low-skilled workers” is a positive statement because it can be tested empirically.
实证陈述是关于经济如何运行的、可检验的事实性陈述。它可以通过数据和证据加以证实或反驳。例如，“提高最低工资导致低技能工人就业率下降”是一个实证陈述，因为它可以通过经验数据进行检验。
A normative statement, by contrast, expresses a value judgement about what should happen. It is subjective and based on opinions, ethics, or political views. For example, “The government should increase the minimum wage” is a normative statement because it reflects a belief about a desirable outcome.
相比之下，规范陈述表达的是关于“应该发生什么”的价值判断。它是主观的，基于观点、伦理或政治立场。例如，“政府应该提高最低工资”是一个规范陈述，因为它反映了对某种理想结果的信念。
Positive statements: descriptive and testable → “what is”
Normative statements: prescriptive and subjective → “what ought to be”
实证陈述：描述性且可检验 → “是什么”
规范陈述：规范性且主观 → “应该是什么”
2. The Distinction Between Fact and Value | 事实与价值的区分
The key difference between positive and normative statements lies in their relationship to facts and values. Positive statements rely on objective evidence; their truth or falsehood can be determined by investigation. Normative statements rely on ethical, moral, or political values, which cannot be proven right or wrong by data alone.
实证陈述与规范陈述的关键区别在于它们与事实和价值的关系。实证陈述依赖客观证据；其真伪可以通过调查研究来确定。规范陈述依赖伦理、道德或政治价值观，这些无法仅凭数据证明其对错。
Consider the following pairs of statements. The first in each pair is positive, the second is normative:
考虑以下几组陈述。每组中的第一个是实证陈述，第二个是规范陈述：
- “A reduction in income tax rates increases disposable income.” (Positive) / “降低所得税率会增加可支配收入。”（实证）
- “The government should reduce income tax rates.” (Normative) / “政府应该降低所得税率。”（规范）
- “The unemployment rate in the UK reached 3.8% in 2023.” (Positive) / “2023年英国失业率达到3.8%。”（实证）
- “The unemployment rate is too high and must be reduced.” (Normative) / “失业率过高，必须降低。”（规范）
- “Free trade raises total global output.” (Positive) / “自由贸易提高全球总产出。”（实证）
- “Free trade is fairer than protectionism.” (Normative) / “自由贸易比保护主义更公平。”（规范）
3. Why the Distinction Matters for Economists | 为什么这一区分对经济学家很重要
Economists strive to be objective when analysing economic issues. By using positive statements, they can describe cause-and-effect relationships without letting personal opinions interfere. This allows economic theories to be tested, refined, or rejected based on evidence.
经济学家在分析经济问题时应力求客观。通过使用实证陈述，他们可以在不受个人观点干扰的情况下描述因果关系。这使经济理论能够基于证据被检验、修正或推翻。
Normative statements, while not scientific, are still important. They inform policy debates and reflect the goals and values of society. For instance, deciding whether to prioritise economic growth or income equality is a normative question, but the trade-off involved can be analysed using positive economics.
规范陈述虽然不具科学性，但仍然重要。它们为政策辩论提供依据，反映社会的目标和价值观。例如，决定优先考虑经济增长还是收入平等是一个规范问题，但其中涉及的权衡可以用实证经济学来分析。
Positive economics: objective analysis of economic behaviour
Normative economics: recommendations based on value judgements
实证经济学：对经济行为的客观分析
规范经济学：基于价值判断的建议
4. Examples in Microeconomics | 微观经济学中的例子
In microeconomics, positive statements often concern how consumers and firms respond to changes in prices, incomes, or costs. Normative statements often concern whether certain market outcomes are desirable.
在微观经济学中，实证陈述通常涉及消费者和企业如何应对价格、收入或成本的变化。规范陈述则通常涉及某些市场结果是否可取。
Example 1: The price elasticity of demand. A positive statement is: “Demand for cigarettes is price inelastic in the short run.” This can be tested by observing consumer responses to price changes. A normative statement is: “The government should heavily tax cigarettes to discourage smoking.” This reflects a value judgement about public health.
例1：需求价格弹性。一个实证陈述是：“短期内香烟的需求是缺乏弹性的。”这可以通过观察消费者对价格变化的反应加以检验。一个规范陈述是：“政府应对香烟征收重税以 discouraging 吸烟。”这反映了对公共健康的价值观判断。（注：discourage 用中文表达为“劝止”更合适。）
Example 2: Market failure. A positive statement is: “Rent controls cause a shortage of housing.” A normative statement is: “Rent controls are an unjust way to redistribute income.” The first can be verified by studying housing markets; the second depends on one’s ethical perspective.
例2：市场失灵。一个实证陈述是：“租金管制导致住房短缺。”一个规范陈述是：“租金管制是一种不公正的收入再分配方式。”前者可以通过研究住房市场加以验证；后者取决于个人的伦理视角。
| Statement typu / 类型 | Example / 例子 | Testable? / 可检验? |
| Positive / 实证 | A rise in income increases demand for luxury goods. / 收入增加会增加对奢侈品的需求。 | Yes / 是 |
| Normative / 规范 | Luxury goods are unfair. / 奢侈品是不公平的。 | No / 否 |
5. Examples in Macroeconomics | 宏观经济学中的例子
In macroeconomics, positive statements include claims about national income, inflation, unemployment, and economic growth that can be checked against data. Normative statements often involve policy recommendations and competing objectives.
在宏观经济学中，实证陈述包括关于国民收入、通货膨胀、失业和经济增长的说法，这些说法可以用数据加以核实。规范陈述通常涉及政策建议和相互竞争的目标。
- Positive: “An increase in the money supply causes inflation in the long run.” / 实证：“长期内货币供应量增加会导致通货膨胀。”
- Normative: “The central bank should keep inflation below 2% at all costs.” / 规范：“中央银行应不惜代价将通胀率保持在2%以下。”
- Positive: “Higher government borrowing raises interest rates.” / 实证：“政府借贷增加会推高利率。”
- Normative: “The government must balance its budget every year.” / 规范：“政府必须每年平衡预算。”
- Positive: “Economic growth in China has reduced global poverty.” / 实证：“中国的经济增长减少了全球贫困。”
- Normative: “Economic growth should be prioritised over environmental protection.” / 规范：“经济增长应优先于环境保护。”
Notice how the positive statements can be tested using historical data or econometric techniques, while the normative statements reflect personal or political beliefs about what policy should achieve.
注意，实证陈述可以用历史数据或计量经济学方法进行检验，而规范陈述则反映个人或政治层面关于政策应当实现什么目标的信念。
6. The Role of Value Judgements in Policy Making | 价值判断在政策制定中的作用
Even when economists agree on positive analysis, they may disagree on normative policy recommendations. This is because policy choices involve trade-offs between objectives such as efficiency, equity, and stability. For example, two economists might agree that a carbon tax reduces emissions (positive), but one might oppose the tax because it hurts low-income households, while another supports it because it benefits the environment (normative).
即使经济学家在实证分析上达成一致，他们也可能在规范性政策建议上产生分歧。这是因为政策选择涉及效率、公平和稳定等目标之间的权衡。例如，两位经济学家可能都同意碳税能减少排放（实证），但其中一位可能因为碳税损害低收入家庭而反对，另一位则因为碳税有利于环境而支持（规范）。
Value judgements also play a role in deciding which data to collect, which assumptions to make, and how to interpret ambiguous results. Therefore, while positive economics is objective in principle, the questions economists ask are often motivated by normative concerns.
价值判断在选择收集哪些数据、作出哪些假设以及如何解释模棱两可的结果方面也发挥作用。因此，虽然实证经济学原则上要求客观，但经济学家提出的问题往往受规范性关切驱动。
Policy = positive analysis + value judgement
政策 = 实证分析 + 价值判断
7. Recognising Positive and Normative Statements in Exams | 在考试中识别实证与规范陈述
In CIE A-Level Economics, questions often ask students to identify whether a statement is positive or normative, or to explain why the distinction matters. Key signal words help with identification:
在CIE A-Level经济学考试中，考题经常要求学生判断一个陈述是实证还是规范，或解释这一区分为何重要。关键信号词有助于识别：
| Positive signal words / 实证信号词 | Normative signal words / 规范信号词 |
| is, are, will, causes, leads to, results in, can be measured / 是、将会、导致、引起、结果是、可以被测量 | should, ought to, must, desirable, unfair, better, worse / 应该、应当、必须、可取的、不公平的、更好的、更差的 |
Students should also be ready to rewrite a normative statement as a positive one, or vice versa. For example, changing “The government should reduce taxes” (normative) into “Reducing taxes increases consumer spending” (positive) requires replacing the value judgement with a testable hypothesis.
学生还应准备好将规范陈述改写为实证陈述，反之亦然。例如，将“政府应该减税”（规范）改写为“减税增加消费者支出”（实证），需要用可检验的假设取代价值判断。
8. Common Mistakes and Tips | 常见错误与提示
A common mistake is to assume that a statement is positive simply because it is about facts, or normative because it includes the word “should”. However, some positive statements are false, and some normative statements are phrased without “should”. The true test is testability, not accuracy or phrasing.
一个常见错误是认为只要陈述涉及事实就是实证的，或者只要包含“应该”就是规范的。然而，有些实证陈述是错误的，有些规范陈述并不含“应该”。真正的检验标准是“可否检验”，而不是正确性或用词。
- Tip 1: Ask yourself, “Could I prove or disprove this with evidence?” If yes, it is positive. / 提示1：问自己“我能否用证据证明或反驳这一点？”如果能，就是实证。
- Tip 2: Ask yourself, “Does this express an opinion about what should happen?” If yes, it is normative. / 提示2：问自己“这是否表达了关于应该发生什么的想法？”如果是，就是规范。
- Tip 3: Be careful with statistics. A statement with numbers can still be normative if it includes words like “too high” or “unacceptable”. / 提示3：注意统计数据。即使带数字的陈述，如果包含“过高”或“不可接受”这类词，仍可能是规范。
- Tip 4: In evaluation paragraphs, use the distinction to criticise a policy. For instance, “The positive analysis suggests a trade-off, but whether the policy is desirable is a normative judgement.” / 提示4：在评估段落中，利用这一区分批评某项政策。例如：“实证分析表明存在权衡，但该政策是否可取则涉及规范判断。”
9. Why This Distinction Is a Key Skill for A-Level Economics | 为什么这一区分是A-Level经济学的关键技能
Asking students to separate positive from normative statements develops critical thinking. It encourages them to question the objectivity of headlines, political speeches, and even economic reports. In a world full of biased information, the ability to identify value judgements is an essential skill.
要求学生区分实证与规范陈述有助于培养批判性思维。它鼓励学生质疑新闻标题、政治演讲甚至经济报告的客观性。在这个充满偏见信息的世界里，识别价值判断的能力是一项基本技能。
Moreover, the distinction helps students structure essays. When discussing a government policy, they can first present the positive economic analysis and then evaluate the normative implications. This clear structure is rewarded in CIE mark schemes, especially in evaluated questions.
此外，这一区分有助于学生构建文章结构。在讨论政府政策时，他们可以先进行实证经济分析，然后评估规范含义。这种清晰的结构在CIE评分标准中受到青睐，尤其是在评估类题目中。
Finally, understanding positive and normative economics allows students to appreciate the limits of economics as a science. Economics cannot tell us what society ought to value; it can only help us understand the consequences of our choices. The final decision always rests on human judgement.
最后，理解实证与规范经济学使学生能够认识到经济学作为一门科学的局限性。经济学无法告诉我们社会应当珍视什么；它只能帮助我们理解选择的后果。最终的决定始终取决于人的判断。
Published by TutorHao | Economics Revision Series | aleveler.com
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