📚 IGCSE Economics: Experimental Operations Guide | IGCSE 经济：实验操作指南
Classroom experiments bring economic theory to life. In IGCSE Economics, practical simulations help you understand how markets work, why prices change, and how different economic agents make decisions. This guide walks you through a series of simple, hands-on experiments that you can run with your classmates — from setting up a double oral auction to modelling inflation. Each experiment is designed to reinforce core syllabus concepts such as demand and supply, price elasticity, market failure, and monetary policy.
课堂实验让经济理论变得生动。在 IGCSE 经济课程中，实践模拟能帮助你理解市场如何运行、价格为何变化以及不同经济主体如何决策。本指南将带你完成一系列简单的动手实验——从建立双向口头拍卖到模拟通货膨胀。每个实验都旨在巩固核心考纲概念，例如需求与供给、价格弹性、市场失灵和货币政策。
1. Preparing Your Economics Laboratory | 准备你的经济学实验室
Unlike science subjects, an economics laboratory is simply your classroom with minimal props. You need a whiteboard to record prices and quantities, small slips of paper for recording trades, and a set of role cards for buyers and sellers. Arrange desks so that participants can walk around freely to negotiate. A stopwatch helps keep rounds timed.
与理科不同，经济学实验室其实就是你的教室，只需少量道具。你需要一块白板记录价格和数量、记录交易的小纸条，以及一套买方和卖方的角色卡片。布置课桌，使参与者能够自由走动进行谈判。秒表有助于控制每轮时间。
- Buyer cards: each states a maximum willingness to pay. Seller cards: each states a minimum acceptable price (cost).
- 买方卡：每张写明最高支付意愿。卖方卡：每张写明最低可接受价格（成本）。
- Use tokens or fake money to settle transactions. Keep a trading sheet for each student to log the price and quantity exchanged.
- 使用代币或假钞结算交易。为每位学生准备一张交易记录表，记录成交价格和数量。
- Ensure all participants understand they must trade voluntarily and aim to maximise their own surplus.
- 确保所有参与者理解他们必须自愿交易，并力求最大化自己的剩余。
2. Experiment 1: The Double Oral Auction and Price Discovery | 实验一：双向口头拍卖与价格发现
This is the classic market experiment to demonstrate how competitive markets reach equilibrium. Give each buyer a willingness-to-pay value and each seller a cost value randomly distributed around a theoretical equilibrium price. When you say 'market open', buyers call out bids and sellers call out offers. A trade occurs when a buyer and seller agree on a price, which is then recorded on the board.
这是展示竞争性市场如何达到均衡的经典市场实验。随机分配给每位买方一个支付意愿值，给每位卖方一个围绕理论均衡价格分布的成本值。当你宣布“市场开盘”时，买方叫出买价，卖方叫出卖价。当买卖双方就价格达成一致时，交易即告完成，价格随即记录在白板上。
- Run 3-4 consecutive trading rounds without changing the underlying values. Observe how the average price converges toward the intersection of the market demand and supply curves.
- 连续进行 3-4 轮交易，不改变基础数值。观察平均价格如何向市场需求曲线和供给曲线的交点收敛。
- Calculate consumer surplus and producer surplus after each round by summing differences between reservation values and actual prices.
- 每轮结束后，通过加总保留价值与实际价格之差来计算消费者剩余和生产者剩余。
- Introduce a price ceiling or price floor in later rounds to illustrate shortages and surpluses — a key IGCSE topic.
- 在后续轮次中引入价格上限或价格下限，以说明短缺和过剩——这是 IGCSE 的重要主题。
3. Experiment 2: Shifts in Demand and Supply | 实验二：需求与供给的移动
Build on the first experiment by introducing external shocks. After a stable equilibrium is reached, announce a change: for example, 'a health report shows the product halves heart disease risk'. Immediately increase each buyer's willingness to pay by 20 %. Run another round and note the new higher equilibrium price and quantity. For a supply shock, tell sellers that input costs have risen, raising their minimum acceptable price. Observe contraction along the demand curve.
在第一个实验的基础上引入外部冲击。在达到稳定均衡后，宣布一个变化：例如，“一份健康报告显示该产品可将心脏病风险减半”。立即将每位买方的支付意愿提高 20%。再运行一轮，记录新的更高均衡价格和数量。对于供给冲击，告诉卖方投入成本上升，提高了他们的最低可接受价格。观察需求曲线上的收缩。
- This experiment directly illustrates the difference between a movement along a curve and a shift of the curve, helping you tackle MCQ questions on determinants of demand and supply.
- 该实验直接展示了沿曲线移动与曲线平移的区别，有助于解决关于需求和供给决定因素的选择题。
- Record results in a table with columns: Round, Shock Type, Average Price, Quantity Traded, Consumer Surplus, Producer Surplus.
- 用表格记录结果，列标题为：轮次、冲击类型、平均价格、交易量、消费者剩余、生产者剩余。
- Ask students to draw the market diagram after each round, shifting the appropriate curve and labelling the new equilibrium.
- 要求学生在每轮结束后绘制市场图表，移动相应的曲线并标出新的均衡。
4. Experiment 3: Price Elasticity of Demand Simulation | 实验四：需求的价格弹性模拟
Price elasticity is often tested in IGCSE, but students confuse elastic and inelastic demand. Set up two separate markets running simultaneously: one for a necessity (like 'drinking water') and one for a luxury (like 'cinema tickets'). In the necessity market, give buyers high willingness to pay across the board. In the luxury market, give buyers widely varying values. In each market, have sellers post a price, and buyers decide how much to buy using a fixed budget.
价格弹性在 IGCSE 中经常考察，但学生容易混淆弹性需求与非弹性需求。同时设立两个独立市场：一个是必需品市场（如“饮用水”），另一个是奢侈品市场（如“电影票”）。在必需品市场，给所有买方较高的支付意愿；在奢侈品市场，给买方差异较大的估值。每个市场中，卖方公布价格，买方用固定预算决定购买量。
- Change the price in each market by 20 % from one period to the next. Measure the percentage change in quantity demanded.
- 将每个市场的价格从一个时期到下一个时期提高 20%。测量需求量的百分比变化。
- Students calculate PED using the formula: PED = (% change in quantity demanded) / (% change in price).
- 学生使用公式计算 PED：PED = （需求量变动百分比）/（价格变动百分比）。
- Expect PED < 1 for water (inelastic) and PED > 1 for cinema (elastic), reinforcing how the availability of substitutes and the necessity nature of a good affect elasticity.
- 预期水的 PED < 1（非弹性），电影票的 PED > 1（弹性），强化替代品的可获得性及商品必要性如何影响弹性。
- Link this to total revenue: in the elastic market, a price rise lowers total revenue; in the inelastic market, it raises total revenue. Collect total spending data to verify.
- 将此与总收益联系起来：在弹性市场中，涨价降低总收益；在非弹性市场中，涨价增加总收益。收集总支出数据加以验证。
5. Experiment 4: Government Intervention — Tax Incidence | 实验四：政府干预——税收归宿
Taxation is a core IGCSE topic. Design an experiment where sellers must pay a per-unit tax to the 'government' (the teacher) for each transaction. Start with a standard double auction to establish an equilibrium. Then impose a ₦2 tax per unit on sellers. Sellers now treat their cost as original cost + tax. Predict that the supply curve shifts vertically upward by ₦2.
税收是 IGCSE 的核心主题。设计一个实验，卖方必须为每笔交易向“政府”（老师）支付单位税。从标准双向拍卖开始，建立均衡。然后对卖方征收每单位 ₦2 的税。卖方现在将成本视为原始成本加税金。预测供给曲线向上垂直移动 ₦2。
- After the tax round, compare the new equilibrium price with the old one. The price buyers pay rises, but usually by less than the full ₦2. The tax burden is shared.
- 税收轮次结束后，比较新旧均衡价格。买方支付的价格上升，但通常少于 ₦2。税收负担由双方分担。
- × quantity traded) and show the deadweight loss triangle on a diagram drawn on the board.
- 计算征收的税收收入（单位税 × 交易量），并在白板上绘制的图表上展示无谓损失三角形。
- Repeat with a tax on buyers (reducing their willingness to pay). Demonstrate that the incidence is identical regardless of whom the tax is levied on — a counterintuitive result that impresses examiners.
- 对买方征税（降低其支付意愿）重复实验。证明无论向谁征收，税收归宿是相同的——一个令人惊讶的结果，能给考官留下深刻印象。
6. Experiment 5: Market Failure and Externalities | 实验六：市场失灵与外部性
IGCSE requires understanding of negative production externalities. A simple experiment involves a 'factory' (one group) and 'fishermen' (another group). The factory produces goods for profit by taking cards from a stack, but each card taken adds a 'pollution chip' to a shared bowl. The fishermen's earnings depend on the number of chips remaining clean. At the end, compare total welfare when the factory ignores pollution versus when they must negotiate or pay compensation (Coase-like bargaining).
IGCSE 要求理解负生产外部性。一个简单实验涉及一个“工厂”（一组）和“渔民”（另一组）。工厂通过从一叠卡片中获取利润来生产商品，但每取一张卡片就在公共碗中增加一个“污染筹码”。渔民的收入取决于剩余清洁筹码的数量。最后，比较工厂忽视污染时的总福利与必须谈判或支付补偿（类似科斯谈判）时的总福利。
- Run round 1: factory maximises profit ignoring pollution. Measure fishermen's loss and total social surplus.
- 第一轮：工厂无视污染最大化利润。衡量渔民的损失和社会总剩余。
- Round 2: allow fishermen to pay the factory to reduce output. This internalises the externality, and output falls toward the socially optimal level.
- 第二轮：允许渔民向工厂支付减少产量。这使外部性内部化，产出下降至社会最优水平。
- ternal cost), and marginal private benefit (demand). Identify the overproduction triangle.
- 绘制匹配的图表：边际私人成本（MPC）、边际社会成本（MSC = MPC + 外部成本）和边际私人收益（需求）。识别过度生产三角形。
- This experiment also foreshadows the concept of government taxes to correct externalities, which you can simulate by imposing a pollution tax equal to external cost.
- 该实验也为政府通过征税纠正外部性的概念埋下伏笔，你可以通过征收等于外部成本的污染税来模拟。
7. Experiment 6: Money Creation and Inflation | 实验七：货币创造与通货膨胀
Monetary concepts can feel abstract. This experiment turns your classroom into a mini-economy. Use pieces of candy as the 'currency' and a small number of items (pencils, erasers) as goods. Start with a fixed money supply and let a few rounds of trading determine average prices. Then, double the amount of candy in circulation (helicopter drop).
货币概念可能感觉抽象。这个实验将你的教室变成一个小型经济体。使用糖果作为“货币”，少量物品（铅笔、橡皮）作为商品。从固定的货币供应量开始，让几轮交易决定平均价格。然后，将流通中的糖果数量翻倍（直升机撒钱）。
- strating the quantity theory of money: MV = PY, where V and Y are stable in the short run.
- 观察到价格大约翻倍，说明货币数量论：MV = PY，其中 V 和 Y 在短期内稳定。
- Introduce a central banker (student) who can change the money supply. Discuss how a 2 % inflation target could be achieved by controlling candy injection.
- 引入一位“央行行长”（学生）负责改变货币供应量。讨论如何通过控制糖果注入来实现 2% 的通胀目标。
- Expand to include banks: allow students to deposit candy in a 'bank' that lends out 80 % of deposits. Watch how the money multiplier expands the money supply further.
- 扩展实验引入银行：允许学生将糖果存入一家“银行”，该银行贷出 80% 的存款。观察货币乘数如何进一步扩大货币供应量。
8. Experiment 7: Labour Market and Minimum Wage | 实验八：劳动力市场与最低工资
In IGCSE, you analyse the effect of a minimum wage on employment. Set up a market where 'workers' sell a service (e.g., completing a simple puzzle) and 'employers' buy the service. Each worker has a reservation wage (minimum they will accept). Each employer has a maximum wage they are willing to pay based on a revenue card.
在 IGCSE 中，你分析最低工资对就业的影响。建立一个市场，其中“工人”出售服务（例如，完成一个简单拼图），“雇主”购买服务。每位工人有一个保留工资（他们愿意接受的最低工资）。每位雇主根据一张收入卡有一个愿意支付的最高工资。
- Round 1: free labour market. Find the equilibrium wage and employment level. Calculate total worker surplus (wages minus reservation wages) and employer surplus.
- 第一轮：自由劳动力市场。找出均衡工资和就业水平。计算工人总剩余（工资减保留工资）和雇主剩余。
- Round 2: impose a minimum wage above the equilibrium. Employers hire fewer workers, creating unemployment (surplus of labour). Some previously hired workers now cannot find jobs.
- 第二轮：设定高于均衡的最低工资。雇主雇佣更少工人，造成失业（劳动力过剩）。一些原先被雇佣的工人现在找不到工作。
- Show on a diagram the fall in employment and the deadweight loss. Discuss elasticity of labour demand: if demand is inelastic, unemployment is smaller.
- 在图表上显示就业下降和无谓损失。讨论劳动力需求弹性：如果需求缺乏弹性，失业较少。
- This experiment can be extended with a training program that raises worker productivity (shifts labour demand right), offsetting the negative employment effect.
- 该实验可扩展加入培训计划，提高工人生产率（使劳动力需求曲线右移），抵消负面的就业效应。
9. Experiment 8: International Trade and Tariffs | 实验九：国际贸易与关税
Create two 'countries' in the classroom, Country A and Country B. Country A has a low-cost seller of cloth, Country B has a high-cost cloth industry and a separate tea industry. Initially, no trade is allowed: each country can only consume domestic output. Then open free trade: buyers and sellers from both countries can trade. The low-cost cloth flows from A to B, and tea from B to A. Compare consumption, prices, and total surplus.
在教室里创建两个“国家”，A 国和 B 国。A 国有一个低成本的布料卖方，B 国有一个高成本的布料产业和一个独立的茶叶产业。起初，不允许贸易：每个国家只能消费本国产品。然后开放自由贸易：两国买卖双方可进行交易。低成本布料从 A 流向 B，茶叶从 B 流向 A。比较消费、价格和总剩余。
- This experiment illustrates comparative advantage even if students do not use that term at IGCSE: each country specialises based on what it produces relatively more cheaply.
- 该实验说明了比较优势，即便学生在 IGCSE 中不使用这个术语：每个国家根据其相对成本较低的产品进行专业化。
- Next, impose a tariff: Country B puts a ₦1 tax on imported cloth. Imports fall, domestic cloth producers in B expand output, but consumer surplus falls and the government collects revenue. Show the welfare loss triangles.
- 接着，征收关税：B 国对进口布料征收 ₦1 的税。进口减少，B 国国内布料生产商扩大产出，但消费者剩余下降，政府获得收入。展示福利损失三角形。
- Relate to IGCSE diagrams: world supply is perfectly elastic at world price. Tariff shifts the effective supply curve upward. Label imports with and without tariff.
- 与 IGCSE 图表联系：世界供给在世界价格处完全弹性。关税使有效供给曲线向上移动。标注有、无关税时的进口量。
10. Experiment 9: Behavioural Economics — Anchoring and Fairness | 实验十：行为经济学——锚定与公平
IGCSE syllabuses increasingly touch on behavioural ideas like fairness and bounded rationality. Conduct a simple ultimatum game: Player 1 is given ₦10 and must propose a split with Player 2. If Player 2 accepts, both keep the proposed amounts. If Player 2 rejects, both get nothing.
IGCSE 考纲越来越多地涉及行为经济思想，如公平和有限理性。进行一个简单的最后通牒游戏：玩家 1 获得 ₦10，必须向玩家 2 提出一个分配方案。如果玩家 2 接受，双方按方案获得金额。如果玩家 2 拒绝，双方都一无所获。
- Economically rational Player 2 should accept any positive offer, even ₦1. But real students often reject low offers (below ₦3) to punish unfairness.
- 经济理性下，玩家 2 应接受任何正数提议，即使 ₦1。但真实学生往往拒绝过低提议（低于 ₦3）以惩罚不公平。
- Collect data on average offers. They tend to be around 40-50 % of the pie, contradicting pure self-interest. Discuss implications for wage-setting and consumer behaviour.
- 收集平均提议数据。它们往往在总金额的 40-50% 左右，与纯粹自利相矛盾。讨论对工资设定和消费者行为的影响。
- You can also demonstrate anchoring: ask half the class to write the last two digits of their phone number before estimating the number of countries in Africa. Show how high numbers lead to high estimates.
- 你还可以展示锚定效应：让一半同学在估计非洲国家数量之前写下手机号码的最后两位数字。展示高数字如何导致高估计。
11. Recording and Analysing Experimental Data | 记录和分析实验数据
For each experiment, appoint a data recorder who logs every transaction price and quantity. After each session, transfer the raw data into a spreadsheet or a simple table. Plot the data: for example, create a scatter plot of prices over rounds to show convergence. Calculate means, medians, and ranges to discuss volatility.
每个实验指定一名数据记录员，记录每笔交易价格和数量。每轮结束后，将原始数据转入电子表格或简单表格。绘制数据：例如，制作价格随轮次变化的散点图以显示收敛。计算均值、中位数和极差以讨论波动性。
- Use the data to construct demand and supply curves ex post. List all buyers' reservation prices in descending order to derive the demand curve. List all sellers' costs in ascending order for the supply curve.
- 使用数据事后构建需求和供给曲线。按从高到低的顺序列出所有买方的保留价格以推导需求曲线。按从低到高的顺序列出所有卖方的成本以推导供给曲线。
- Compare predicted equilibrium from the intersection of these constructed curves with the actual average trading price. Explain any deviation (e.g., market thinness, negotiation skills).
- 将这些构建曲线的交点处的预测均衡与实际平均交易价格进行比较。解释任何偏差（例如市场稀薄、谈判技巧）。
- Present your findings in a lab report format: objective, method, results (tables, graphs), analysis, and evaluation. This mirrors the scientific approach and is excellent for revision.
- 以实验报告格式呈现你的发现：目的、方法、结果（表格、图表）、分析和评估。这与科学方法相呼应，对复习极有帮助。
12. Common Pitfalls and Tips for Exam Success | 常见误区与考试成功技巧
When you describe experiments in IGCSE exam answers, focus on the economic reasoning, not the logistics. Always link the experiment back to the relevant diagram and definitions. For example, after describing the price floor experiment, state: 'A minimum price set above equilibrium creates excess supply, shown by the horizontal distance between quantity supplied and quantity demanded at that price.'
在 IGCSE 考试答案中描述实验时，应聚焦于经济推理，而非操作细节。始终将实验与相关图表和定义挂钩。例如，在描述价格下限实验后，指出：“设定于均衡之上的最低价格会造成超额供给，表现为该价格下供给量与需求量之间的水平距离。”
- Avoid vague language. Use precise terms: excess demand, allocative efficiency, welfare loss, incidence. These are the keywords examiners look for.
- 避免模糊语言。使用精确术语：超额需求、分配效率、福利损失、归宿。这些是考官寻找的关键词。
- If you run out of time, prioritise experiments on market equilibrium, elasticity, and government intervention — these topics carry the most marks.
- 如果时间有限，优先进行市场均衡、弹性和政府干预相关实验——这些主题分值最高。
- Always discuss the assumptions your experiment relies on: perfect information, many buyers/sellers, no transaction costs. Acknowledging limitations shows higher-order thinking.
- 始终讨论实验所依赖的假设：完全信息、大量买方/卖方、无交易成本。承认局限性体现高阶思维能力。
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