📚 Year 11 OCR Economics: Unit Test Mock Exam Analysis | Year 11 OCR 经济：单元测试模拟卷解析
Mock exams are a powerful tool for GCSE Economics students. This article walks you through a typical Year 11 OCR unit test, breaking down common question types and model answers to boost your confidence and exam technique.
模拟考试是GCSE经济学生的重要工具。本文将带你拆解一份典型的Year 11 OCR单元测试，解析常见题型和标准答案，帮你增强信心，提升考试技巧。
1. Mock Exam Overview & Structure | 模拟卷概览与结构
The OCR unit test usually combines multiple-choice questions (MCQs), short-answer questions, data-response tasks and an extended essay. Mastering each section requires specific strategies.
OCR单元测试通常包含选择题、简答题、数据分析题和长篇论述题。掌握每种题型都需要专门策略。
In this mock, there were 20 MCQs (20 marks), three 4‑mark definition questions, a 6‑mark graph question, an 8‑mark data analysis, and a 12‑mark essay. Time management is key: spend roughly one minute per mark.
本模拟卷有20道选择题（20分）、3道4分定义题、1道6分图表题、1道8分数据分析题和一道12分论述题。时间管理很关键：大约每一分对应一分钟。
A common pitfall is spending too long on low‑value definitions and rushing the essay. Always skim through the whole paper at the start and allocate time proportionally.
常见的失误是在低分值定义题上耗时过长，导致论述题仓促完成。一定要在开卷时快速浏览全卷，按比例分配时间。
2. Scarcity and Opportunity Cost | 稀缺性与机会成本
Question: "Define the economic problem and explain how the concept of opportunity cost helps to illustrate it. Use a current example." (4 marks)
题目：“定义经济问题，并解释机会成本的概念如何帮助说明这一问题。请用当前例子说明。”（4分）
The economic problem exists because finite resources cannot satisfy unlimited wants, forcing choices. Opportunity cost is the value of the next best alternative sacrificed.
经济问题存在的原因是有限资源无法满足无限欲望，迫使人们做出选择。机会成本是所放弃的次优替代品的价值。
he improved transport connectivity forgone. The chain is clear: scarcity → choices → trade‑offs → opportunity cost.
高分答案可以描述政府决定建造新医院而非升级铁路。其机会成本是放弃的交通运输改善。逻辑链很清楚：稀缺→选择→权衡→机会成本。
Many students give only a book definition without linking it to the example. You must explicitly state what is given up and why it matters to the decision‑maker.
许多学生只给出书本定义而不与例子联系。你必须明确说出放弃了什么，以及这对决策者为何重要。
3. Production Possibility Frontier (PPF) | 生产可能性边界
A classic diagram question: "Draw a PPF showing capital and consumer goods. Mark a point of inefficiency (X), a point on the curve (Y), and illustrate economic growth." (6 marks)
经典图表题：“画出一条显示资本品和消费品的PPF。标出无效率点X、曲线上点Y，并展示经济增长。”（6分）
The PPF curve shows the maximum combinations of two goods an economy can produce with given resources and technology. Point X inside the curve represents unemployed or under‑used resources. Point Y on the curve is productively efficient. Growth shifts the entire curve outward.
PPF曲线表示一国在既定资源和技术下能生产的两种商品最大组合。点X在曲线内部代表失业或资源未充分利用。点Y在曲线上是有效率的。增长使整条曲线向外移动。
You must label axes clearly, draw the concave shape, and use arrows to show the outward shift. Explain that growth can result from more resources (e.g. immigration, capital) or better technology.
必须清晰标注坐标轴，画出凹向原点的形状，用箭头表示向外移动。解释增长可源于更多资源（如移民、资本）或技术进步。
Strong answers add that the opportunity cost of growth is current consumption sacrificed for investment, and mention that the PPF illustrates opportunity cost directly.
高分答案会补充，增长的机会成本是为投资而牺牲的当期消费，并提及PPF直接阐释了机会成本。
4. Demand and Supply Analysis | 需求与供给分析
Question: "Using a demand and supply diagram, explain the effect of a new health report claiming that dark chocolate reduces heart disease risk on the market for dark chocolate." (6 marks)
题目：“运用供需图，解释一份新健康报告称黑巧克力降低心脏病风险对黑巧克力市场的影响。”（6分）
The report improves consumer preferences, shifting the demand curve to the right. Supply remains unchanged initially. The market moves to a new equilibrium with higher price and higher quantity. You must draw the shift, label P1, Q1 to P2, Q2, and explain the mechanism in words.
该报告改善了消费者偏好，使需求曲线右移。供给暂时不变。市场达到新均衡，价格上升，数量上升。必须画出移动，标注P1、Q1到P2、Q2，并用文字解释机制。
Common mistake: confusing "increase in demand" (shift) with "increase in quantity demanded" (movement along the curve due to price fall). Stress that a change in taste/preferences shifts the whole curve.
常见错误：混淆“需求增加”（平移）与“需求量增加”（因价格下降沿曲线移动）。强调口味/偏好的变化使整条曲线平移。
5. Price Elasticity of Demand (PED) | 需求价格弹性
Calculate PED: "A gym reduces monthly membership fee from £50 to £40, and monthly memberships rise from 300 to 420. Calculate PED and explain whether total revenue rises." (4 marks)
计算PED：“一家健身房将月费从50英镑降至40英镑，月度会员数从300人增至420人。计算PED并解释总收入是否增加。”（4分）
PED = (% change in Qd) ÷ (% change in Price)
%ΔQd = (120/300)×100 = 40%. %ΔP = (−10/50)×100 = −20% for magnitude). Demand is elastic (>1), so a price cut raises total revenue: original TR = £15,000, new TR = £40×420 = £16,800.
需求量变化% = (120/300)×100 = 40%。价格变化% = (−10/50)×100 =
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