📚 Year 9 WJEC Economics: Case Study Practical Exercises | 九年级WJEC经济学：案例分析实战演练
Case studies are a crucial part of WJEC GCSE Economics, allowing you to apply theoretical concepts to real-world situations. Mastering case study analysis is key to scoring high marks. This guide provides practical exercises and tips tailored for Year 9 students, helping you build confidence in tackling exam-style case studies.
案例研究是WJEC GCSE经济学的重要组成部分，让你能够将理论概念应用于现实世界的情境。掌握案例分析是获得高分的关键。本指南为九年级学生量身定制了实战练习和技巧，帮助你自信应对考试风格的案例研究。
1. What is a Case Study in Economics? | 经济学中的案例研究是什么？
In WJEC Economics, a case study presents a scenario, often with data, about a business, market, or economic issue. Your task is to analyse it using economic theory. For Year 9, this might involve a local shop, a new product launch, or a government policy change.
在WJEC经济学中，案例研究通常会呈现一个情境，并附有数据，涉及企业、市场或经济问题。你需要运用经济学理论对其进行分析。对于九年级学生，这可能涉及本地商店、新产品发布或政府政策变化。
Typically, you will be asked to define key terms, explain causes and effects, draw diagrams, and evaluate outcomes. You need to demonstrate not just knowledge, but also application and analysis skills.
通常，你会被要求定义关键术语、解释原因和结果、绘制图表并评估结果。你需要展示的不仅是知识，还有应用和分析能力。
2. The Art of Reading Economic Data | 解读经济数据的艺术
Case studies often include tables, graphs, or extracts. Before writing, carefully read all the information provided. Look for trends, peaks, troughs, and any unusual figures. Highlight keywords like 'increase', 'decrease', 'government tax', or 'subsidy'.
案例研究通常包含表格、图表或摘录。在动笔之前，要仔细阅读提供的所有信息。寻找趋势、峰值、低谷和任何异常数字。标记出如“增加”、“减少”、“政府税收”或“补贴”等关键词。
For example, if a table shows the price of coffee rising from £2.00 to £3.50 over a year, you should note the percentage change and consider what might cause this (e.g., higher demand, lower supply). Always link data to economic concepts.
例如，如果一张表格显示咖啡价格在一年内从£2.00上涨到£3.50，你应该记录百分比变化，并思考可能的原因（比如需求增加、供应减少）。始终将数据与经济学概念联系起来。
3. Identifying Key Economic Concepts | 识别关键经济概念
Every case study is built around core concepts like scarcity, opportunity cost, demand, supply, elasticity, and market structures. Your first job is to spot which concepts are relevant. Ask yourself: Is there a limited resource? Are consumers changing their buying habits? Is the government stepping in?
每个案例研究都围绕稀缺性、机会成本、需求、供给、弹性以及市场结构等核心概念展开。你的首要任务是找出相关的概念。问问自己：是否存在有限资源？消费者是否改变了购买习惯？政府是否在干预？
Practice by extracting these ideas from short newspaper articles or business reports. For instance, a story about a coffee shop running out of beans during a festival highlights scarcity and high demand. Later, we will walk through a full coffee shop case.
你可以通过从短篇新闻文章或商业报告中提取这些观点来练习。例如，一家咖啡店在节日期间咖啡豆售罄的故事就凸显了稀缺性和高需求。稍后，我们将完整剖析一个咖啡店案例。
4. Scarcity and Choice in Real Life | 现实生活中的稀缺与选择
Scarcity is the fundamental economic problem that wants are unlimited but resources are finite. In a case study, you might see a manufacturer deciding whether to produce more Product A or Product B because they have a limited budget or raw materials. This introduces opportunity cost.
稀缺性是最基本的经济问题，即欲望是无限的，而资源是有限的。在案例研究中，你可能会看到一家制造商因为预算或原材料有限，而决定是生产更多产品A还是产品B。这就引入了机会成本。
For example, a farmer has 10 acres of land and must choose between growing wheat or barley. If he chooses wheat, the opportunity cost is the barley he could have grown. Always define opportunity cost as the next best alternative foregone.
例如，一个农民有10英亩土地，必须在种植小麦或大麦之间做出选择。如果他选择小麦，机会成本就是他所放弃的大麦。始终要将机会成本定义为所放弃的次优选择。
5. Supply and Demand in Action | 供需法则的实际应用
Most case studies involve shifts in demand or supply. You need to explain how these shifts affect equilibrium price and quantity. Use the following reasoning: If demand increases (shift right), price rises and quantity increases. If supply decreases (shift left), price rises and quantity falls.
大多数案例研究都涉及需求或供给的变化。你需要解释这些变化如何影响均衡价格和数量。使用以下推理：如果需求增加（曲线右移），价格上升，数量增加。如果供给减少（曲线左移），价格上升，数量减少。
Draw simple diagrams. Even in written answers, describe the movement. For instance, 'The hot weather caused a surge in demand for ice cream, shifting the demand curve from D1 to D2. This led to a higher equilibrium price P2 and larger quantity Q2.' Be precise.
绘制简单的图表。即使在书面答案中，也要描述曲线的移动。例如，‘炎热天气导致冰淇淋需求激增，需求曲线从D1向右移动到D2。这使得均衡价格上升到P2，均衡数量增加到Q2。’表述要精确。
6. Understanding Elasticity Through Cases | 通过案例理解弹性
Price elasticity of demand (PED) measures responsiveness. A case might state that a 10% price increase for a luxury chocolate brand caused sales to drop by 25%. Calculate PED:
需求价格弹性(PED)衡量的是反应程度。一个案例可能指出，某奢侈巧克力品牌提价10%导致销量下降25%。计算PED：
PED = %ΔQd / %ΔP = -25% / 10% = -2.5 (elastic)
Explain what this means: consumers are very sensitive to price changes.
解释含义：消费者对价格变化非常敏感。
Knowledge of elasticity helps businesses set prices and governments predict tax revenue. In Year 9, focus on whether demand is elastic (>1) or inelastic (<1). A simple table can help:
了解弹性有助于企业定价，也有助于政府预测税收收入。在九年级阶段，重点要掌握需求是富有弹性(>1)还是缺乏弹性(<1)。一个简单的表格可以帮助理解：
| PED Value | Term | Meaning |
|---|---|---|
| > 1 | Elastic | Quantity demanded changes more than price |
| < 1 | Inelastic | Quantity demanded changes less than price |
| = 1 | Unit elastic | Proportional change |
Use this table to identify elasticity from data. Always remember that PED is usually negative, but we often ignore the minus sign when categorising.
使用此表格从数据中识别弹性。请始终记住，PED通常为负值，但在分类时我们通常忽略负号。
7. Market Structures Illustrated | 市场结构图解
WJEC Year 9 introduces basic market structures: perfect competition, monopoly, and perhaps oligopoly. A case study might describe many small cafes in a city (perfect competition) or a single rail service provider (monopoly). Identify the number of firms, barriers to entry, and nature of the product.
WJEC九年级会介绍基本的市场结构：完全竞争、垄断，可能还有寡头垄断。一个案例研究可能描述一个城市里有许多小型咖啡馆（完全竞争），或者只有一家铁路服务提供商（垄断）。要识别企业数量、进入壁垒和产品性质。
For example, a case on local bakeries: 'There are 15 bakeries in town, all selling similar bread, and it's easy to open a new one.' This suggests a competitive market, so prices are likely low and profits normal in the long run. Contrast with a patented medicine firm.
例如，关于本地面包店的案例：‘镇上有15家面包店，都销售相似的面包，且开新店很容易。’这表明是一个竞争性市场，因此价格可能较低，长期利润为正常利润。与此相反的是拥有专利的药品公司。
8. Government Intervention Scenarios | 政府干预情景
Governments intervene in markets through taxes, subsidies, price controls, and regulations. Your case could involve a new sugar tax on soft drinks. You need to analyse the impact on price, quantity, and different stakeholders (consumers, producers, government).
政府通过税收、补贴、价格管制和法规干预市场。你的案例可能涉及对软饮料征收新的糖税。你需要分析对价格、数量以及不同利益相关者（消费者、生产者、政府）的影响。
Using a diagram, show the supply curve shifting left due to the tax, leading to a higher price and lower quantity. Explain that the tax burden is shared between consumers and producers. Mention that tax revenue might be used for health campaigns.
通过图表展示供给曲线因税收而向左移动，导致价格变高、数量减少。解释税收负担由消费者和生产者共同承担。提及税收收入可能被用于健康宣传活动。
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