Year 10 WJEC Economics: Common Misconceptions and How to Correct Them | Year 10 WJEC 经济：常见误区与纠正方法

📚 Year 10 WJEC Economics: Common Misconceptions and How to Correct Them | Year 10 WJEC 经济：常见误区与纠正方法

Many Year 10 students studying WJEC Economics find themselves grappling with concepts that seem straightforward at first glance but often harbour subtle misunderstandings. These misconceptions can lead to lost marks in exams and a shaky foundation for further study. This article identifies nine of the most common errors and provides clear corrections, helping you build a more accurate economic vocabulary and reasoning.

许多学习 WJEC 经济学课程的 Year 10 学生常会对一些乍看简单、实则暗藏玄机的概念产生理解偏差。这些误区会在考试中导致失分，也不利于后续学习打下扎实基础。本文梳理了九个最常见的错误，并提供清晰的纠正方法，帮助你建立更准确的经济学表达和推理方式。

1. Confusing a Movement Along the Demand Curve with a Shift of the Demand Curve | 混淆需求曲线上的移动与需求曲线位移

A very common mistake is to say ‘demand increases’ when the price of the good itself falls, causing consumers to buy more. In WJEC exam questions, this is a movement along the demand curve (an extension in quantity demanded), not a shift. The term ‘demand’ refers to the entire relationship between price and quantity, so it only shifts when a non-price factor changes, such as income, tastes, or the price of related goods.

一个非常常见的错误是，当商品自身价格下降、消费者购买量增加时，就说“需求增加了”。在 WJEC 考试中，这只是沿着需求曲线的移动（需求量增加），而不是需求曲线本身的位移。“需求”一词指的是价格与需求量之间的整体关系，只有当收入、偏好或相关商品价格等非价格因素发生变化时，需求才会发生位移。

To correct this, always ask: did the price of the good itself change? If yes, it is a movement along the curve. If something else changed, it is a shift. Drawing the graph and labelling the axes properly will help you avoid this confusion. On a diagram, a shift is represented by entirely new curve, while a movement is shown by moving from one point to another on the same curve.

纠正方法是，每次分析时先问自己：是不是商品自身的价格发生了变化？如果是，那就是沿着曲线的移动；如果不是，而是其他因素改变，那才是需求曲线的位移。画图并正确标注坐标轴能有效帮助你避免这种混淆。在图表上，位移表现为一条全新的曲线，而移动只是在同一条曲线上从一个点变动到另一个点。

2. Mixing Up Supply and Quantity Supplied | 混淆供给与供给量

Similar to demand, many students use ‘supply’ when they mean ‘quantity supplied’. If the price of a good rises and producers are willing to offer more for sale, that is an extension in quantity supplied, not an increase in supply. A shift of the entire supply curve only occurs when conditions of production change, such as technology improvements, input costs, or taxes.

与需求的情况类似，很多学生把“供给量”说成了“供给”。如果一种商品的价格上升，生产者愿意出售更多数量，这是供给量增加，而不是供给增加。只有当生产条件发生变化，例如技术进步、投入成本变动或税收调整，才会引起整条供给曲线的位移。

Remember: changes in the good’s own price cause movements along the supply curve; changes in other factors shift the supply curve. In exam contexts, precise language is essential to earn full marks for analysis. If you write ‘supply increases’ when the correct term is ‘quantity supplied increases’, you may lose marks for inaccurate economic terminology.

请记住：商品自身价格的变化导致沿供给曲线的移动；其他因素的变化则导致供给曲线的位移。在考试情境下，精准的表述对于拿到分析部分的满分至关重要。如果你用“供给增加”来表述本应为“供给量增加”的情形，很可能因经济术语不准确而被扣分。

3. Thinking Price Is the Only Factor That Affects Demand | 误以为价格是影响需求的唯一因素

While the law of demand tells us that, ceteris paribus, a higher price leads to a lower quantity demanded, many students wrongly conclude that price is the only factor influencing consumers’ decisions. In reality, changes in real income, advertising, population size, the prices of substitutes and complements, and shifting tastes all shift the demand curve.

虽然需求定律告诉我们，在其他条件不变的情况下，价格越高需求量越低，但许多学生错误地认为价格是影响消费者决策的唯一因素。实际上，实际收入的变化、广告、人口规模、替代品和互补品的价格以及偏好的改变，都会引起需求曲线的位移。

When answering exam questions, avoid stating that ‘demand falls because the price is too high’ unless you are specifically referring to a movement along a given demand curve. If you intend to explain why the entire curve shifted leftward, you must cite a non-price determinant. A helpful habit is to list the factors that can shift demand: income, tastes, population, advertising, and prices of related goods.

在回答考题时，除非你特意指的是沿着既定需求曲线的移动，否则不要简单地说“因为价格太高，所以需求下降了”。如果你要解释整条需求曲线为何向左位移，必须引用一个非价格决定因素。一个有用的习惯是，列出能够使需求位移的因素：收入、偏好、人口、广告以及相关商品的价格。

4. Opportunity Cost Equals Only Money Spent | 机会成本仅仅等于所花费的金钱

One of the first concepts introduced in Year 10 WJEC Economics is opportunity cost. Many students mistakenly equate it with the monetary price of an item. While money paid is part of the cost, opportunity cost is the value of the next best alternative forgone. For example, if you spend an hour revising economics instead of playing football, the opportunity cost is the enjoyment and health benefits of playing football, not merely £0.

Year 10 WJEC 经济学最先接触的概念之一就是机会成本。许多学生错误地将其等同于购买某件物品所花的金钱。虽然支付的货币是成本的一部分，但机会成本是指你所放弃的次优选择的价值。例如，如果你花一小时复习经济而不是去踢足球，机会成本就是踢足球带来的快乐和健康益处，而不仅仅是零英镑。

To avoid this misconception, always identify the real next best alternative that was sacrificed. This is a crucial skill for understanding production possibility frontiers and government policy choices. This concept also applies to government spending: when a government chooses to build a new motorway instead of investing in hospitals, the opportunity cost is the improved healthcare that is lost.

为了避开这个误区，一定要找出真正被牺牲掉的次优选择。这是理解生产可能性边界和政府政策选择的一项关键能力。这一概念同样适用于政府支出：当政府选择修建新高速公路而不是投资医院时，机会成本就是所失去的改善医疗的机会。

5. Believing Any Point Inside the PPF Is Efficient | 认为生产可能性边界内的任何点都是有效率的

A production possibility frontier (PPF) shows the maximum possible output combinations. Points on the curve represent productive efficiency. However, a point inside the curve indicates that resources are unemployed or not used efficiently. Students sometimes mark inside points as ‘efficient’ because they are attainable, but efficiency means getting the most output from scarce resources, which only occurs on the frontier.

生产可能性边界（PPF）展示了最大可能的产出组合。曲线上的点代表生产效率。但曲线内部的点则表示资源未被充分利用或未被有效利用。学生有时会把曲线内部的点标为“有效率的”，理由是这些点是可以达到的，但效率意味着用稀缺资源获得最大产出，而这只有在边界上才能实现。

Remember: any point inside the PPF is attainable but inefficient; points outside are unattainable with current resources. Economic growth shifts the PPF outward. Economic growth can be shown by an outward shift of the PPF, meaning the economy can now produce more of both goods. This is not the same as moving from an inside point to the frontier, which simply represents an end to unemployment of resources.

请记住：PPF 内部的任何点都是可以达到但无效率的；外部的点在现有资源下无法达到。经济增长则会使 PPF 向外移动。经济增长可以通过 PPF 向外移动来表示，这意味着该经济体现在可以生产更多这两种商品。这与从边界内的点移动到边界上不同，后者仅仅代表资源不再闲置。

6. Confusing Positive and Normative Statements | 混淆实证表述与规范表述

In WJEC exams, you are often asked to distinguish between positive and normative economic statements. A positive statement is objective and can be tested or proven true or false (e.g., ‘Unemployment rose to 5% last year’). A normative statement involves a value judgement and cannot be tested (e.g., ‘The government should reduce unemployment’). Students frequently mix these up, labelling an opinion as a fact or vice versa.

在 WJEC 考试中，常会要求你区分实证表述和规范表述。实证表述是客观的，可以检验、可以证实或证伪（例如“去年失业率升至5%”）。规范表述则包含价值判断，无法检验（例如“政府应该降低失业率”）。学生经常将其弄混，把观点标为事实，或反过来标错。

A useful tip: look for words like

Published by TutorHao | Year 10 Economics Revision Series | aleveler.com

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