📚 GCSE CCEA Economics: Guide to Conducting Experiments | GCSE CCEA 经济：实验操作指南
Experiments bring economics to life by letting you test theories in a controlled setting. This guide equips you with the practical steps to design, run and evaluate simple classroom experiments, directly supporting the research skills that CCEA GCSE Economics expects you to develop. Whether you are exploring price determination or behavioural biases, careful experiment design will deepen your understanding and sharpen your analytical thinking.
实验让经济学变得生动，因为你能在受控环境中检验理论。这份指南为你提供设计、运行和评估简单课堂实验的实用步骤，直接支持 CCEA GCSE 经济学科要求你发展的研究技能。无论你是在探索价格决定还是行为偏差，精心的实验设计都会加深你的理解并锻炼你的分析思维。
1. Why Conduct Experiments in Economics? | 为什么要在经济学科中进行实验？
Economics is often seen as a theoretical subject, but it ultimately studies the real choices people make. Classroom experiments allow you to observe supply and demand in action, test predictions about market efficiency, and uncover cognitive shortcuts that influence financial decisions. For your CCEA coursework, carrying out a small-scale experiment gives you primary data, which makes your analysis more convincing and personal.
经济学常被视为理论学科，但它最终研究的是人们做出的真实选择。课堂实验让你能够观察供求机制的运作，检验关于市场效率的预测，并发现影响财务决策的认知捷径。对于你的 CCEA 课程作业，进行小规模实验能为你提供一手数据，使你的分析更有说服力也更个人化。
Moreover, experiments reveal that even simple rules — such as double-auction trading — can lead to competitive equilibrium prices. Experiencing this first-hand helps you grasp concepts like consumer surplus, producer surplus and allocative efficiency far better than any diagram alone.
此外，实验揭示了即便是简单规则——如双向拍卖——也能导致竞争性均衡价格。亲身体验这一点，能让你比光看图表更深刻地把握消费者剩余、生产者剩余和配置效率等概念。
2. Preparing Your Experiment | 准备你的实验
Before you recruit any participants, you must define the economic principle you want to investigate. Common topics for GCSE experiments include the law of demand, price elasticity, the impact of a minimum price (price floor), or how information asymmetry affects bargaining. Once you have a focus, write a clear research question — for example, 'Does introducing a £2 seller fee reduce the quantity of goods traded in a classroom market?'
在招募任何参与者之前，你必须先明确要研究的经济学原理。GCSE 实验中常见的主题包括需求定律、价格弹性、最低限价（价格下限）的影响，或者信息不对称如何影响谈判。一旦确定了焦点，写下清晰的研究问题——例如，“引入 2 英镑卖方费用是否会减少课堂市场中交易的商品数量？”
Next, list the resources you will need: printed instruction sheets, record tables, tokens or playing cards to represent goods, and a timer. If your experiment involves money, use mock currency or a points system. Always carry out a trial run with a friend to spot unclear instructions or timing issues before the full session.
接下来，列出你需要的资源：打印好的指令单、记录表、代表商品的筹码或扑克牌，以及计时器。如果实验涉及金钱，请使用模拟货币或积分系统。在正式进行之前，务必和朋友进行一次试运行，以发现指令不清或时间安排的问题。
3. Setting Clear Objectives | 设定明确目标
Every experiment needs a measurable objective. Instead of aiming to 'see how a market works,' frame your aim precisely: 'To measure the average convergence speed of transaction prices toward the predicted equilibrium in six trading rounds.' Linking the objective to a CCEA specification point — such as how price is determined through the interaction of supply and demand — adds academic rigour.
每个实验都需要可衡量的目标。与其设定“看看市场如何运作”，不如精确表述你的目标：“测量在六个交易回合中成交价格向预测均衡收敛的平均速度。” 将目标与 CCEA 大纲要点联系起来——比如价格如何通过供求相互作用决定——会增加学术严谨性。
You should also identify your dependent and independent variables. In a minimum-price experiment, for instance, the independent variable is whether a price floor is imposed, while the dependent variable might be the quantity actually exchanged. Defining these early prevents confusion when you analyse the data.
你还应该明确因变量和自变量。例如，在一个最低限价实验中，自变量是是否实行价格下限，而因变量可能是实际交易的数量。尽早定义这些变量可以避免分析数据时的混乱。
4. Designing the Experiment | 设计实验
Good experimental design isolates the effect of one change. You therefore need at least two conditions: a control condition that mimics a free market without intervention, and a treatment condition where you introduce your variable of interest. Keep all other factors — the number of buyers, the values they hold, the trading rules — identical between conditions.
良好的实验设计能隔离单一变化的影响。因此，你至少需要两种条件：一种是模仿无干预自由市场的控制条件，另一种是引入你感兴趣变量的处理条件。保持其他所有因素——买家数量、他们所持的估值、交易规则——在两种条件之间完全相同。
In a classroom, you can use a within-subject design (the same group experiences both conditions) or a between-subject design (different groups per condition). Within-subject reduces noise caused by individual differences but may create order effects; counterbalancing the sequence of conditions helps minimise this bias. Whichever you choose, explain your design choice in your write-up.
在课堂上，你可以使用被试内设计（同一组体验两个条件）或被试间设计（不同组各负责一个条件）。被试内设计减少了个体差异带来的噪声，但可能产生顺序效应；平衡条件先后的顺序有助于最小化这种偏差。无论选择哪种，都要在报告中解释你的设计选择。
5. Recruiting Participants | 招募参与者
For a GCSE economics experiment, your classmates form a natural and accessible sample. Explain the purpose of the study simply but avoid revealing the hypothesis in a way that might bias behaviour. Provide a brief consent form that states participation is voluntary and that results will be anonymised — your teacher can help draft this.
对于 GCSE 经济学实验，你的同学是自然而方便的样本。简单解释研究目的，但要避免以可能诱导行为的方式透露假设。提供一份简单的知情同意书，说明参与是自愿的且结果将匿名——你的老师可以帮忙起草。
Aim for at least 12–16 participants to obtain meaningful results. Fewer than 8 makes it hard to discern patterns, especially in market experiments where individual outliers can skew averages. If your class is small, consider repeating the experiment over several lunchtime sessions to increase your dataset.
争取至少 12–16 名参与者以获得有意义的结果。少于 8 人时很难识别模式，尤其是在市场实验中，个别异常值可能扭曲平均值。如果班级很小，可以考虑在几个午餐时段重复实验以增加数据量。
6. Control and Treatment Groups | 对照组与实验组
When using a between-subject design, randomly assign participants to control or treatment groups. Even a simple coin toss or drawing numbered slips from a hat works. Random assignment makes the two groups comparable on average, so any observed difference in the dependent variable can be attributed to your treatment rather than to pre-existing differences.
当使用被试间设计时，要将参与者随机分配到对照组或实验组。简单的抛硬币或从帽子里抽号码条即可。随机分配使两组平均水平可比，因此观察到的因变量差异可归因于你的处理，而非事先存在的差异。
For within-subject designs, each participant acts as their own control. Record individual data twice: once under the baseline condition and once under the treatment condition. This approach yields 'paired data' and allows you to calculate the change for each person, strengthening your statistical reasoning even with basic GCSE-level maths.
对于被试内设计，每个参与者都充当自身对照。记录每个人的数据两次：一次在基线条件下，一次在处理条件下。这种方法产生“配对数据”，让你能够计算每个人的变化，即便只用 GCSE 水平的基础数学也能增强你的统计推理。
7. Running the Experiment Session | 实施实验环节
On the day, set up the classroom so participants can interact according to your rules. For a trading pit experiment, buyers hold cards showing their maximum willingness to pay, while sellers hold cards showing their minimum acceptable price. Announce the trading rounds: each round lasts three minutes, during which participants negotiate verbally and record every transaction on a shared board or individual sheet.
在实验当天，按照你的规则布置教室，使参与者能够互动。对于交易场实验，买家持有着显示其最高支付意愿的卡片，卖家则持有着显示其最低可接受价格的卡片。宣布交易回合计时：每个回合持续三分钟，期间参与者口头谈判，并在共享黑板或个人记录表上记录每笔交易。
Strictly enforce the rules: no side payments, no changing the values on the cards, and no trading outside the designated round time. Consistency across sessions is vital for reliability. If possible, have a friend act as a neutral monitor to ensure everyone follows the procedure while you focus on data collection.
严格执行规则：不准有附带支付、不准更改卡片上的数值、不准在指定回合时间之外进行交易。各场次之间的一致性对信度至关重要。有可能的话，请一位朋友充当中立监督员，确保大家都遵守程序，而你则专注于数据收集。
8. Collecting Data Accurately | 准确收集数据
Prepare a recording table in advance. A simple format might include columns for round number, buyer ID, seller ID, agreed price, and quantity traded. If you are testing a price floor, add a column noting whether the transaction complied with the floor or resulted in a 'black market' outcome. Use a stopwatch and record the exact time each trade is struck if you are analysing negotiation duration.
提前准备记录表格。简单的格式可包含栏目：回合编号、买家编号、卖家编号、成交价格和交易数量。如果你在测试价格下限，增加一栏注明该交易是否遵守了下限，还是产生了“黑市”结果。如果你要分析谈判时长，请使用秒表并记录每笔交易达成的确切时间。
uble-check that no record is missing or duplicated. Labelling your data files consistently — e.g. 'Control_Round1_ClassA' — will save you time when you analyse the results later.
实验结束后，立即将手写数据转录到电子表格中。仔细检查没有遗漏或重复的记录。给数据文件一致命名——例如“Control_Round1_ClassA”——能在你日后分析结果时节省时间。
9. Avoiding Common Biases | 避免常见偏差
Demand characteristics can arise when participants guess the purpose of the experiment and change their behaviour to 'help' the researcher. To reduce this risk, use neutral language: tell them you are studying 'trading patterns' rather than 'checking whether a minimum price distorts the market.' Never coach participants towards a particular choice.
需求特征可能在参与者猜到实验目的并改变行为以“帮助”研究者时出现。为降低这一风险，使用中性语言：告诉他们你们在研究“交易模式”，而不是“检验最低限价是否扭曲市场”。绝不要引导参与者做出某种特定选择。
Experimenter bias, where you unintentionally influence results during recording, can be limited by having a second person independently verify the data. If you are the only observer, commit to recording behaviours exactly as they occur, even if a result contradicts your hypothesis. Honest reporting is a core scientific value.
实验者偏差，即你在记录时无意中影响了结果，可以通过请第二个人独立核实数据来限制。如果你只有自己一人观察，请务必如实地记录行为，即使某个结果与你的假设相矛盾。诚实报告是核心科学价值。
10. Analysing Your Results | 分析你的结果
Begin by calculating descriptive statistics: mean transaction price, modal prices, range, and total quantity traded per round. Plot these on line graphs to visualise trends. In a double-auction experiment, you often see prices clustering around the theoretical equilibrium after a few rounds. Comment on how closely your data matches the model — use the concept of equilibrium price from Unit 1 of CCEA GCSE Economics.
首先计算描述性统计量：平均成交价格、众数价格、全距，以及每个回合的总交易量。将这些数据绘制成折线图以可视化趋势。在双向拍卖实验中，你常能看到价格在几个回合后聚集在理论均衡值附近。评论你的数据与模型的吻合程度——运用 CCEA GCSE 经济学第一单元中的均衡价格概念。
If you have a treatment group and a control group, compare the means by calculating the difference. Even a simple bar chart with both groups side by side can effectively illustrate the treatment effect. Be careful not to over-claim: note that results from one classroom cannot be generalised to all markets, but they can highlight plausible causal links.
如果你有处理组和控制组，通过计算均值差异进行比较。即使简单地将两组并排放置的条形图也能有效展示处理效应。注意不要过度主张：指出一个课堂的结果不能推广到所有市场，但它们可以突出看似合理的因果关系。
11. Drawing Conclusions | 得出结论
Link your findings back to the original economic theory. For example, if a price floor was set above equilibrium and the quantity traded fell, explain how this mirrors real-world minimum wage or agricultural support policies. Mention any unexpected findings — such as sellers offering discounts at the last second to avoid unsold stock — and connect them to concepts like incentives and time pressure.
将你的发现与原始经济理论联系起来。例如，如果价格下限设定在均衡之上而交易量下降，解释这如何映照现实中的最低工资或农业支持政策。提及任何意外发现——比如卖家在最后关头为避滞销而打折——并将其与激励和时间压力等概念关联。
Always acknowledge limitations: small sample size, lack of real financial stakes, or distractions in the classroom may have affected behaviour. Suggest how the experiment could be improved if repeated — perhaps by introducing a computer-based trading platform or using real (small) monetary rewards to heighten engagement.
始终承认局限性：样本量小、缺乏真实金钱激励、或课堂中的干扰都可能影响行为。建议如果重复实验可如何改进——或许引入基于电脑的交易平台，或采用真实（小额）金钱奖励来提高投入度。
12. Writing Your Experiment Report | 撰写实验报告
Structure your report with the following headings: Title, Introduction (including research question and hypothesis), Method (design, participants, materials, procedure), Results (tables, charts, descriptive statistics), Discussion (interpretation, relation to theory, limitations), and Conclusion. Follow the CCEA internal assessment guidelines where relevant, ensuring all data is presented clearly and ethically.
按以下标题组织你的报告：标题、引言（含研究问题和假设）、方法（设计、参与者、材料、程序）、结果（表格、图表、描述统计）、讨论（解读、与理论的联系、局限性）和结论。遵循相关的 CCEA 内部评估指南，确保所有数据的呈现既清晰又合乎伦理。
Use CCEA economic terminology confidently: words like 'equilibrium,' 'elasticity,' 'incentive,' 'scarcity,' and 'opportunity cost' carry weight with examiners. Proofread for spelling and grammar, and ask a peer to read your discussion section to check if your argument flows logically from the evidence.
自信地使用 CCEA 经济学术语：像“均衡”、“弹性”、“激励”、“稀缺性”和“机会成本”这样的词对考官来说很有分量。校对拼写和语法，并请一位同学阅读你的讨论部分，看看你的论证是否从证据中合乎逻辑地展开。
Published by TutorHao | Economics Revision Series | aleveler.com
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