📚 Year 8 WJEC Economics: Unit Test Mock Exam Analysis | Year 8 WJEC 经济：单元测试模拟卷解析
This article provides a step-by-step analysis of a Year 8 WJEC Economics unit test mock paper. It reviews core concepts such as scarcity, opportunity cost, factors of production, demand, and money, helping students understand how to approach exam-style questions. Each question is broken down with model answers and clear explanations.
本文对一份 Year 8 WJEC 经济单元测试模拟卷进行逐步解析。文章回顾了稀缺性、机会成本、生产要素、需求与货币等核心概念，帮助学生掌握解题方法。每道题目都配有示范答案与清晰讲解。
1. Multiple Choice: The Basic Economic Problem | 选择题：基本经济问题
| Question: What is the fundamental economic problem? | |
| A. Unlimited resources | B. Scarcity |
| C. Rapid inflation | D. Trade deficits |
The correct answer is B. Scarcity exists because human wants for goods and services are unlimited, but the resources available to produce them are finite. This forces individuals, firms and governments to make choices about how to allocate resources.
正确答案是 B。稀缺性之所以存在，是因为人类对商品和服务的需求是无限的，而用于生产这些产品的资源却是有限的。这就迫使个人、企业和政府必须就如何分配资源做出选择。
Options A, C and D are incorrect. Unlimited resources would mean no economic problem. Inflation and trade deficits are specific issues, not the fundamental condition that gives rise to all economic decisions.
选项 A、C 和 D 均不正确。资源无限意味着不存在经济问题；通货膨胀和贸易逆差属于具体现象，并非引发所有经济决策的基本状况。
2. True or False: Needs and Wants | 判断题：需要与想要
| Statement: "A games console is a basic need." | |
| True | False |
The statement is false. A basic need refers to something essential for survival, such as food, water, shelter and clothing. A games console is a want – something that makes life more enjoyable but is not necessary to stay alive.
该说法错误。基本需要指的是维持生存所必需的物品，例如食物、水、住所和衣物。游戏机是一种想要——它能让生活更愉快，但并非维持生命所必需。
Students often mix up the two categories. Remember that needs are limited and universal, whereas wants are unlimited and vary from person to person. Exam questions frequently test this distinction.
学生常常混淆这两类概念。记住，需要是有限且普遍的，而想要是无限的并且因人而异。考试题目经常考查这一区别。
3. Definition: Opportunity Cost | 定义题：机会成本
Question: Define the term 'opportunity cost'. (2 marks)
题目：定义“机会成本”。(2分)
Opportunity cost is the value of the next best alternative that is forgone when a choice is made. Because resources are scarce, choosing one option means sacrificing the benefit you would have received from the next best option.
机会成本是指做出选择时所放弃的次优替代选项的价值。由于资源是稀缺的，选择一个选项就意味着牺牲你本可以从次优选项中获得的收益。
For full marks, the definition must include the idea of a sacrificed alternative. An example alone is not enough, but a good definition can be supported by an illustration: if a student spends an hour studying economics instead of playing football, the opportunity cost is the enjoyment and fitness gained from playing football.
要拿到满分，定义中必须包含被牺牲的替代选项这一概念。仅举例不够，但可以用例子来辅助说明：如果一名学生花一小时学习经济而不是踢足球，那么机会成本就是踢足球带来的乐趣和锻炼。
4. Multiple Choice: Factors of Production | 选择题：生产要素
| Question: Which factor of production refers to the human effort used in the production process? | |
| A. Land | B. Labour |
| C. Capital | D. Enterprise |
The correct answer is B, Labour. Labour includes all physical and mental human effort applied in the production of goods and services. Land covers natural resources, capital refers to man-made tools and machinery, and enterprise is the willingness to take risks and organise the other three factors.
正确答案是 B，劳动。劳动包括在商品和服务生产中投入的所有体力和脑力人力努力。土地指自然资源，资本指人造工具和机器，而企业则是承担风险并组织其他三种要素的意愿。
Exam tips: Be precise. Do not describe capital as 'money' – in economics, capital means physical goods used to produce other goods, like a delivery van or a sewing machine.
考试技巧：用词要准确。不要将资本描述为“钱”——在经济学中，资本指用于生产其他产品的实物资产，比如送货面包车或缝纫机。
5. Matching: Goods and Services | 连线题：商品与服务
| Item | Category |
| A haircut | Service |
| A bicycle | Good |
| Online tutoring | Service |
| A loaf of bread | Good |
Goods are tangible, physical items that you can see and touch, such as a bicycle or a loaf of bread. Services are intangible actions that someone does for you, like cutting hair or providing a lesson.
商品是有形的、看得见摸得着的实物，例如自行车和面包。服务是他人为你完成的无形行为，比如理发或授课。
Confusion can arise with digital products. A downloaded film is a good (intangible good), whereas streaming it as part of a subscription can be viewed as a service. For Year 8 level, stick to clear examples.
数字产品容易引起混淆。下载的电影属于商品（无形商品），而通过订阅观看串流则可视为服务。在 Year 8 阶段，使用清晰的例子即可。
6. Data Response: Calculating a Budget | 数据分析：计算预算
Scenario: Ben receives £25 pocket money per week. His weekly spending includes £8 on snacks, £5 on mobile top-up and £4 on saving for a game. He also donates £2 to charity. Calculate Ben's weekly surplus or deficit. (3 marks)
情景：Ben 每周得到 25 英镑零花钱。他每周花费包括 8 英镑零食、5 英镑手机充值、4 英镑游戏储蓄和 2 英镑慈善捐款。计算 Ben 的每周盈余或赤字。(3分)
Total expenditure = £8 + £5 + £4 + £2 = £19. The formula for the budget balance is:
总支出 = 8英镑 + 5英镑 + 4英镑 + 2英镑 = 19英镑。预算余额计算公式如下：
Budget balance = Income – Expenditure
预算余额 = 收入 – 支出
Budget balance = £25 – £19 = £6. Since the result is positive, Ben has a surplus of £ a deficit. Always state whether the balance is a surplus or deficit, not just the number.
预算余额 = 25 – 19 = 6（英镑）。由于结果为正，Ben 获得了 6 英镑盈余。如果支出超过收入，答案就是赤字。作答时务必说明是盈余还是赤字，而不能只写数字。
7. Short Answer: The Law of Demand | 简答题：需求定律
Question: State the law of demand. (2 marks)
题目：陈述需求定律。(2分)
The law of demand states that, ceteris paribus (all other things being equal), as the price of a good or service increases, the quantity demanded decreases. Conversely, when the price falls, the quantity demanded increases.
需求定律指出，在其他条件不变的前提下，当某种商品或服务的价格上升时，其需求量会下降。反之，当价格下降时，需求量会上升。
Many students forget the 'ceteris paribus' assumption. Without it, other factors like changes in income or tastes could affect demand. For two marks, the answer must show the inverse relationship between price and quantity demanded.
许多学生容易遗漏“其他条件不变”这一假设。没有它，收入和偏好等因素的变化也会影响需求。要拿到 2 分，答案必须体现出价格与需求量之间的反向关系。
8. Case Study: Identifying Opportunity Cost | 案例研究：识别机会成本
Scenario: Maya has £15. She can either buy a new book or go to the cinema. She chooses the book. What is the opportunity cost of her decision? Explain. (3 marks)
情景：Maya 有 15 英镑。她可以买一本新书或去看电影。她选择了买书。她这一决策的机会成本是什么？请解释。(3分)
The opportunity cost is the visit to the cinema. When Maya chose the book, she gave up the next best alternative, which was watching a film at the cinema. The opportunity cost is not the £15 itself, because the money would be spent either way.
机会成本是去电影院看电影。当 Maya 选择买书时，她放弃了次优替代选项，即去电影院看电影。机会成本不是 15 英镑本身，因为这笔钱无论如何都会被花掉。
A common mistake is to say the opportunity cost is the money. In economics, the cost is what you are sacrificing – the foregone experience. Always identify the next best alternative, not the financial payment.
常见的错误是把机会成本说成是钱。在经济学中，成本指的是你所牺牲的东西——即被放弃的体验。一定要指出次优选择，而不是货币支付。
9. Applied Topic: Production Possibility Trade-off | 应用题：生产可能性取舍
Question: A small bakery can produce either cupcakes or biscuits using the same oven and ingredients. If it shifts all resources from producing 50 cupcakes to producing 60 biscuits, what is the opportunity cost of one biscuit? Explain in terms of foregone cupcakes.
题目：一家小面包店使用同样的烤箱和原料可以生产纸杯蛋糕或饼干。如果它将全部资源从生产 50 个纸杯蛋糕转向生产 60 块饼干，那么一块饼干的机会成本是多少？请使用被放弃的纸杯蛋糕来解释。
s (50 cupcakes ÷ 60 biscuits) = 5/6 of a cupcake per biscuit, approximately 0.83 cupcakes.
从 50 个纸杯蛋糕转向 60 块饼干，意味着以牺牲 50 个纸杯蛋糕为代价获得了 60 块饼干。每块饼干的机会成本是 (50个纸杯蛋糕 ÷ 60块饼干) = 5/6 个纸杯蛋糕，约 0.83 个纸杯蛋糕。
This illustrates the concept of trade-offs on a production possibility frontier (PPF). Because resources are scarce, producing more of one good requires producing less of another. The rate of this sacrifice is the opportunity cost.
这说明了生产可能性边界(PPF)上的权衡概念。由于资源稀缺，多生产一种商品就必须少生产另一种商品。这种牺牲的比率就是机会成本。
10. Multiple Choice: Functions of Money | 选择题：货币的功能
| Question: Which of the following is NOT a function of money? | |
| A. Medium of exchange | B. Store of value |
| C. Unit of account | D. Source of income |
The correct answer is D. Money itself is not a source of income; it is a tool used in transactions. The three classic functions of money are medium of exchange (used to buy goods), store of value (can be saved and used later), and unit of account (measures the value of items).
正确答案是 D。货币本身并非收入来源，而是一种交易工具。货币的三大经典功能是：交易媒介（用于购买商品）、价值储藏（可以储存并在未来使用）和计价单位（衡量物品的价值）。
While you can earn interest by saving money, that is a return on saving, not an inherent function of money. Many examiners look for the understanding that money facilitates trade rather than creates wealth by itself.
虽然你可以通过储蓄赚取利息，但那是储蓄的回报，并非货币本身的功能。考官常常希望看到考生理解货币是促进贸易的工具，而非自行创造财富的东西。
Published by TutorHao | Economics Revision Series | aleveler.com
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