Trade Unions: Key Exam Points for IB & WJEC Economics | IB/WJEC 经济：工会考点精讲

📚 Trade Unions: Key Exam Points for IB & WJEC Economics | IB/WJEC 经济：工会考点精讲

Trade unions are organisations formed by workers to protect and promote their collective interests, primarily concerning wages, working conditions, and employment rights. For IB and WJEC Economics students, understanding trade unions is crucial not only for the ‘Labour Markets’ topic but also for discussing government intervention, market failure, and macroeconomic performance. This article breaks down the key concepts, diagrams, and evaluation points you need to master for your exams.

工会是由工人组成的组织，旨在保护和促进他们的集体利益，主要涉及工资、工作条件和就业权利。对于 IB 和 WJEC 经济学学生来说，理解工会不仅对“劳动力市场”主题至关重要，而且对于讨论政府干预、市场失灵和宏观经济表现也必不可少。本文分解了你需要掌握的关键概念、图表和评估要点。

1. What Are Trade Unions? | 什么是工会？

A trade union is an association of workers in a particular trade, industry, or company that seeks to improve the pay, working conditions, and job security of its members. Unions achieve their objectives mainly through collective bargaining with employers. In some cases, they may also engage in industrial action, such as strikes or work-to-rule, if negotiations fail.

工会是某一特定行业、产业或公司中工人的协会，旨在改善其成员的薪酬、工作条件和工作保障。工会主要通过与管理层的集体谈判来实现其目标。在某些情况下，如果谈判失败，他们也可能会采取罢工或按章工作等工业行动。

In economics, trade unions are considered a key institutional factor that can distort the competitive labour market equilibrium. They effectively act as a monopoly supplier of labour, enabling workers to bargain for wages above the market-clearing level. The role and power of unions vary greatly across countries and over time, influenced by legislation, economic structure, and public attitudes.

在经济学中，工会被认为是一个能够扭曲竞争性劳动力市场均衡的关键制度因素。他们有效地充当了劳动力的垄断供应者，使工人能够争取到高于市场出清水平的工资。工会的角色和力量因国家和时间而异，受到立法、经济结构和公众态度的影响。

2. Types of Trade Unions | 工会的类型

Trade unions can be categorised based on their membership scope and objectives. The main types include:

工会可以根据其会员范围和目标进行分类。主要类型包括：

Craft unions – represent workers with specific skills, e.g., electricians or plumbers. They often restrict entry to maintain high wages.
行业工会 – 代表具有特定技能的工人，例如电工或管道工。他们通常通过限制进入来维持高工资。
Industrial unions – represent all workers in a particular industry regardless of their specific job, e.g., steelworkers or miners.
产业工会 – 代表某一特定产业中的所有工人，无论其具体工作是什么，例如钢铁工人或矿工。
General unions – represent workers across various industries and occupations, often unskilled or semi-skilled, e.g., public sector unions.
一般工会 – 代表跨行业和职业的工人，通常是非熟练或半熟练工人，例如公共部门工会。
White-collar unions – represent professional and office workers, such as teachers or nurses.
白领工会 – 代表专业人士和办公室职员，如教师或护士。

Understanding these types helps explain why some unions have more bargaining power than others: craft unions with specialised, irreplaceable skills can exert greater influence than a general union of low-skilled workers in a competitive labour market.

理解这些类型有助于解释为什么一些工会比其他工会拥有更强的谈判力：拥有专业、不可替代技能的行业工会，比竞争性劳动力市场中低技能工人组成的一般工会能发挥更大的影响力。

3. Collective Bargaining | 集体谈判

Collective bargaining is the process by which trade unions and employers negotiate wages, hours, and working conditions. It can take place at the firm level, industry level, or national level. The outcome depends on the relative bargaining power of both sides, which is influenced by factors such as the union’s membership density, the firm’s profitability, and the legal framework.

集体谈判是工会与雇主就工资、工时和工作条件进行协商的过程。它可以在企业层面、行业层面或国家层面进行。结果取决于双方的相对谈判力，这受工会密度、企业盈利能力和法律框架等因素的影响。

In economic models, the result of collective bargaining is often a wage above the competitive equilibrium. This wage is not determined solely by supply and demand but by a bargaining range between the union’s target wage and the employer’s maximum offer. The final wage depends on each party’s ability to withstand a strike or lockout.

在经济模型中，集体谈判的结果往往是工资高于竞争性均衡。这个工资不仅由供求决定，而是由工会的目标工资与雇主的最大报价之间的谈判区间决定。最终工资取决于双方承受罢工或停工的能力。

4. Wage Determination in a Competitive Labour Market | 竞争性劳动力市场中的工资决定

Without a trade union, in a perfectly competitive labour market, the equilibrium wage rate (W₀) and quantity of labour (L₀) are determined by the intersection of labour demand (D = MRP) and labour supply (S). All workers willing to work at the market wage find employment.

在没有工会的情况下，在完全竞争的劳动力市场中，均衡工资率（W₀）和劳动数量（L₀）由劳动力需求（D = MRP）和劳动力供给（S）的交点决定。所有愿意以市场工资工作的工人都能找到工作。

Trade unions aim to shift this equilibrium by using their market power. They can negotiate a wage above W₀, which has consequences for employment, as we will see. The competitive model serves as a benchmark against which the effects of unionisation are measured.

工会旨在通过利用其市场力量来改变这个均衡。他们可以谈判获得高于 W₀ 的工资，这将对就业产生影响，正如我们将看到的。竞争性模型充当了衡量工会化效应的基准。

5. Impact of Unions on Wages and Employment in a Competitive Market | 竞争性市场中工会对工资和就业的影响

When a union successfully bargains for a higher wage (WU > W₀), the firm’s labour demand curve (MRP) remains unchanged. At the higher wage, the firm will reduce the number of workers it employs from L₀ to LU. This creates a surplus of labour, or unemployment, equal to the difference between the number of workers who wish to work at WU and those actually hired (LU).

当工会成功谈判到更高的工资（WU > W₀）时，企业的劳动力需求曲线（MRP）保持不变。在更高的工资水平下，企业将把雇用的工人数量从 L₀ 减少到 LU。这会产生劳动力过剩或失业，其规模等于希望在 WU 工资下工作的工人数量与实际雇用数量（LU）之间的差额。

In a diagram, this is shown as a horizontal line at WU above the equilibrium. The distance between the supply curve and demand curve at WU represents the resulting unemployment. Thus, the primary cost of higher union wages in a competitive market is increased unemployment among workers whose marginal revenue product is below the union wage.

在图中，这表现为在 WU 处一条高于均衡点的水平线。在 WU 工资下供给曲线与需求曲线之间的距离代表了由此产生的失业。因此，在竞争性市场中，工会较高工资的主要代价是，那些边际收益产品低于工会工资的工人中的失业人数增加了。

Unemployment effect: Lₛ – LU, where Lₛ is the supply of labour at WU

失业效应：Lₛ – LU，其中 Lₛ 是工资为 WU 时的劳动力供给

6. Trade Unions in a Monopsony Labour Market | 买方垄断劳动力市场中的工会

A monopsony exists when there is only one buyer of labour in a market, e.g., a dominant employer in a small town. A profit-maximising monopsonist will hire workers up to the point where marginal cost of labour (MCL) equals marginal revenue product (MRP), but it pays a wage (WM) determined by the labour supply curve at that employment level, which is lower than the competitive wage. This results in both lower wages and lower employment compared to perfect competition.

当市场上只有一个劳动力买家时，就存在买方垄断，例如一个小镇上的主导雇主。一个追求利润最大化的买方垄断者，会在劳动力边际成本（MCL）等于边际收益产品（MRP）的点上雇佣工人，但它支付的工资（WM）由该就业水平下的劳动力供给曲线决定，这低于竞争性工资。与完全竞争相比，这导致更低的工资和更低的就业。

Here, a trade union can potentially increase both wages and employment. By setting a minimum wage at WU within a certain range, the union effectively makes the labour supply curve horizontal up to that point. The monopsonist then becomes a wage-taker and will hire workers where the fixed wage equals MRP. This can lead to higher employment (LU > LM) and a higher wage, offsetting the monopsony’s exploitation of workers.

在这里，工会有可能同时提高工资和就业。通过在某个范围内设定最低工资 WU，工会有效地使劳动供给曲线在达到该工资之前变为水平。买方垄断者于是成为工资接受者，并会在固定工资等于 MRP 的点上雇佣工人。这会带来更高的就业（LU > LM）和更高的工资，抵消了买方垄断对工人的剥削。

This is a vital evaluation point for exams: trade unions can be beneficial in labour markets where employers have significant market power, improving both efficiency and equity. However, if the union pushes the wage too high (beyond the intersection of MRP and the original supply curve), employment will fall.

这是一条重要的考试评估点：工会在雇主拥有显著市场力量的劳动力市场中可能是有益的，既能提高效率又能增进公平。然而，如果工会将工资推得过高（超过 MRP 与原供给曲线的交点），就业就会下降。

7. Trade Unions and Efficiency Wage Theory | 工会与效率工资理论

Efficiency wage theory suggests that paying workers a wage above the market-clearing level can actually raise productivity and reduce a firm’s labour costs per unit of output. Higher wages can reduce labour turnover, attract better applicants, increase worker effort, and improve morale.

效率工资理论表明，支付给工人高于市场出清水平的工资实际上可以提高生产率，并降低企业每单位产出的劳动力成本。较高的工资可以减少劳动力流动、吸引更优秀的求职者、增加工人的努力程度并提高士气。

Trade unions can facilitate efficiency wage outcomes by bargaining for wages that firms might not offer voluntarily but which ultimately enhance productivity. For instance, the ‘threat of job loss’ effect is strengthened when high union wages mean a worker has more to lose from dismissal. This perspective provides a counterargument to the view that unions always reduce efficiency.

工会可以通过谈判争取企业可能不愿主动提供但最终能提高生产率的工资，从而促进效率工资结果。例如，当高额的工会工资意味着工人被解雇后的损失更大时，“失业威胁”效应就会加强。这一观点为“工会总是降低效率”的论点提供了反驳。

8. The Economic Effects of Trade Unions | 工会的经济影响

Trade unions have wide-ranging effects on the economy beyond just wage negotiations. These include:

工会对经济的影响远超工资谈判，包括：

Productivity – Unions can act as a ‘voice’ for workers, reducing turnover and encouraging investment in training. However, work rules and resistance to change may harm productivity.
生产率 – 工会可以作为工人的“声音”，减少员工离职并鼓励对培训的投入。但是，工作规定和对变革的抵制可能会损害生产率。
Income distribution – By raising wages for members, unions can reduce wage inequality between unionised and non-unionised sectors, but may also create inequality between insiders and outsiders.
收入分配 – 通过提高成员工资，工会可以减少有工会部门与无工会部门之间的工资不平等，但也可能在内部人和外部人之间造成不平等。
Inflation – If widespread union wage increases exceed productivity growth, they can lead to cost-push inflation, especially in an economy near full employment.
通货膨胀 – 如果广泛的工会工资增长超过生产率增长，它们可能导致成本推动型通货膨胀，尤其是在接近充分就业的经济体中。

For exams, it is vital to discuss these effects using AD/AS analysis and to distinguish between short-run and long-run consequences.

对于考试，至关重要的是利用 AD/AS 分析来讨论这些影响，并区分短期和长期后果。

9. Pros and Cons of Trade Union Activity | 工会活动的利弊

Advantages of trade unions include: improved working conditions, higher wages for members, reduced wage inequality with management, increased labour productivity through better morale, and the provision of a channel for workers’ grievances. In a monopsony, they can correct market failure.

工会的优势包括：改善工作条件，提高成员工资，减少与管理层的工资差距，通过更好的士气提高劳动生产率，并提供工人申诉的渠道。在买方垄断下，他们可以纠正市场失灵。

Disadvantages include: potential unemployment in competitive markets, higher production costs which may reduce firms’ international competitiveness, inflationary pressures, and possible misuse of industrial power causing disruption. Also, unions may protect unproductive workers and resist technological progress.

劣势包括：竞争性市场中可能导致失业，更高的生产成本可能降低企业的国际竞争力，通货膨胀压力，以及可能滥用工业力量造成混乱。此外，工会可能保护非生产性工人并抵制技术进步。

Evaluating the overall impact requires considering the specific context: the type of union, the market structure of the employer, the legal environment, and the state of the economy. There is no one-size-fits-all conclusion.

评估整体影响需要考虑具体的背景：工会类型、雇主的市场结构、法律环境以及经济状况。没有一刀切的结论。

10. Trade Union Membership and Decline | 工会会员与衰退

In many advanced economies, trade union membership has fallen significantly since the 1980s. For example, in the UK, union density fell from over 50% in 1979 to around 23% by recent years. The main reasons include:

在许多发达经济体中，自 20 世纪 80 年代以来，工会会员数量显著下降。例如，在英国，工会密度从 1979 年的超过 50% 下降到近年来的约 23%。主要原因包括：

Structural change – decline in heavily unionised manufacturing and growth in service sectors where unionisation is harder.
结构性变化 – 工会化程度高的制造业衰落，难以工会化的服务业增长。
Legislation – laws making it more difficult to strike or requiring regular ballots for industrial action (e.g., UK’s Employment Acts of 1980s).
立法 – 使罢工更困难或要求工业行动需定期投票的法律（如 20 世纪 80 年代英国的《就业法》）。
Increased labour market flexibility – more part-time, temporary, and gig-economy work reduces union identity.
劳动力市场灵活性增加 – 更多的兼职、临时和零工经济工作降低了工会认同感。
Globalisation – firms argue that high union wages reduce competitiveness against foreign producers, encouraging de-unionisation.
全球化 – 企业认为高额的工会工资会降低相对于外国生产商的竞争力，从而鼓励去工会化。

Despite the decline, unions remain important in certain sectors like public services, transportation, and education, and they continue to influence political and economic debates.

尽管有所下降，工会在公共服务、交通运输和教育等某些部门仍然重要，并且继续影响着政治和经济辩论。

11. Exam Tips for IB and WJEC Economics | IB 与 WJEC 经济学考试技巧

For IB Economics, trade unions feature in the ‘Labour Market’ section of Microeconomics and are an excellent topic for Paper 1 part (b) evaluation questions. When discussing union intervention, always use real-world examples (e.g., the RMT union in UK rail, the UAW in US auto) and include a clear, well-labelled diagram. For WJEC, you may be asked to compare the labour market with and without trade unions, or evaluate the role of trade unions in a mixed economy. Emphasise the contrast between competitive and monopsony outcomes.

对于 IB 经济学，工会出现在微观经济学“劳动力市场”部分，是试卷一第（b）部分评估题的绝佳主题。在讨论工会干预时，务必使用真实案例（例如英国铁路的 RMT 工会、美国汽车工人联合会 UAW），并附上一个清晰、标注良好的图表。对于 WJEC，你可能会被要求比较有工会和没有工会的劳动力市场，或评估工会在混合经济中的作用。要强调竞争性结果与买方垄断结果之间的对比。

Common assessment objectives include: explain how a trade union can cause unemployment (AO2), evaluate whether trade unions improve living standards (AO3), and discuss the effectiveness of government policies towards trade unions (AO3). Always structure your answers with definitions, diagrams, explanation, and evaluation using criteria like short-run vs long-run, different stakeholder perspectives, and the importance of market structure.

常见的评估目标包括：解释工会如何导致失业（AO2），评价工会是否提高了生活水平（AO3），讨论政府对工会政策的有效性（AO3）。始终按照定义、图表、解释和评价的结构来组织答案，并使用短期与长期、不同利益相关者视角以及市场结构的重要性等评价标准。

12. Conclusion | 总结

Trade unions are multifaceted institutions whose economic impact cannot be judged in isolation. In competitive markets, they may create unemployment and inefficiency, but in monopsonistic markets they can enhance both wages and employment. Additionally, by giving workers a collective voice, unions can contribute to productivity and social equity. For top marks in IB and WJEC exams, demonstrate a nuanced understanding that goes beyond textbook simplifications, integrating theory with contemporary evidence.

工会是多面性的机构，其经济影响不能孤立地判断。在竞争性市场中，他们可能造成失业和低效率，但在买方垄断市场中，他们能同时提高工资和就业。此外，通过给予工人集体发言权，工会有助于提高生产率和社会公平。要在 IB 和 WJEC 考试中取得高分，就要展示出超越教科书简单化的细致理解，将理论与当代证据相结合。

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Trade Unions: Key Exam Points for IB & WJEC Economics | IB/WJEC 经济：工会考点精讲