Trade Unions in Economics | 工会考点精讲

📚 Trade Unions in Economics | 工会考点精讲

A trade union is an organised association of workers formed to protect and promote their common interests, particularly in matters of wages, working conditions, and job security. In the IB and Edexcel Economics syllabus, understanding the role of trade unions is essential for analysing labour market imperfections, wage determination, and the trade-off between efficiency and equity. This article consolidates the key theoretical concepts, models, and evaluation points you need to master.

工会是由工人组织形成的协会，旨在保护和促进其共同利益，尤其是在工资、工作条件和工作保障方面。在IB和Edexcel经济学大纲中，理解工会的作用对于分析劳动力市场的不完全性、工资决定以及效率与公平之间的权衡至关重要。本文整合了你需要掌握的关键理论概念、模型和评估要点。

1. Definition and Core Functions of Trade Unions | 工会的定义与核心职能

A trade union is a collective organisation of employees that bargains with employers on behalf of its members. Its primary functions include negotiating wages and non-wage benefits, defending employment rights, providing legal support, and lobbying for favourable labour legislation.

工会是一个雇员集体组织，代表其成员与雇主进行谈判。其核心职能包括协商工资和非工资福利、维护就业权利、提供法律支持，以及游说有利的劳动立法。

Unions aim to counterbalance the bargaining power of employers, who typically have greater financial and informational resources. By substituting individual bargaining with collective bargaining, workers can achieve outcomes closer to a monopoly seller of labour, although this ‘monopoly’ power is constrained by factor market dynamics.

工会旨在平衡雇主通常拥有的更大财务和信息资源的议价能力。通过用集体谈判取代个人谈判，工人可以实现更接近劳动力垄断卖家的结果，尽管这种“垄断”力量受到要素市场动态的制约。

In economic theory, unions are often modelled as labour market institutions that influence the supply of labour, wage floors, and employment levels. The extent of their influence depends on union density (the proportion of workers unionised), the legal framework, and the elasticity of labour demand.

在经济理论中，工会通常被建模为影响劳动力供给、工资下限和就业水平的劳动力市场制度。其影响力大小取决于工会密度（工会会员比例）、法律框架以及劳动力需求弹性。

2. Types of Trade Unions and Their Objectives | 工会类型及其目标

Economists distinguish between several types of trade unions: craft unions (representing workers with specific skills), industrial unions (covering all workers in an industry, regardless of skill), general unions (open to workers across different sectors), and white-collar unions (for professional or clerical staff). Each type may pursue different objectives based on its membership profile.

经济学家区分了几种类型的工会：行业工会（代表具有特定技能的工人）、产业工会（覆盖某个行业的所有工人，不论技能）、总工会（向不同行业的工人开放）和白领工会（代表专业人士或文职人员）。每种类型根据其会员结构可能追求不同的目标。

The principal objectives are typically maximising the real wage rate, maximising employment for members, or both under a constrained optimisation. In IB and Edexcel diagrams, this often involves a union choosing a point on the labour demand curve, or shifting the labour supply curve to the left through closed-shop practices or licensing requirements.

主要目标通常是最大化实际工资率，最大化会员就业，或两者在约束条件下的优化。在IB和Edexcel图表中，这通常涉及工会选择劳动力需求曲线上的一点，或通过只雇用工会会员的做法或许可证要求将劳动力供给曲线向左移动。

Craft unions often restrict labour supply by controlling entry into the profession (e.g., requiring long apprenticeships), thereby raising the equilibrium wage for those already qualified.
行业工会 通常通过控制职业准入（例如要求长时间学徒期）来限制劳动力供给，从而提高已合格者的均衡工资。
Industrial unions aim to organise all workers in a sector and use the threat of a strike to push wages above the competitive level. This creates a wage floor and may result in excess supply of labour (unemployment).
产业工会 旨在组织一个行业的所有工人，并利用罢工威胁将工资推高至竞争水平之上。这会产生工资下限，可能导致劳动力供给过剩（失业）。

3. Modelling Union Wage-Setting: The Monopoly Union Model | 工会工资设定模型：垄断工会模型

The standard model for a union negotiating with many employers is the monopoly union model. Here, the union acts as a single seller of labour and faces the market labour demand curve, which slopes downward. The union selects the wage rate, and employers then choose the profit-maximising quantity of labour to hire at that wage.

工会与众多雇主谈判的标准模型是垄断工会模型。在这一模型中，工会充当劳动力的唯一卖方，面对向下倾斜的市场劳动力需求曲线。工会选择工资率，然后雇主根据该工资选择利润最大化的劳动力雇佣量。

If the union aims to maximise the total wage bill, it will choose the point on the labour demand curve where the wage elasticity of demand equals -1 (unitary elasticity), corresponding to the midpoint of a linear demand curve. If it aims to maximise employment of its members subject to a target wage, it will push for a higher wage but with employment determined along the demand curve.

如果工会目标是最大化总工资额，它会选择劳动力需求曲线上工资需求弹性等于-1（单位弹性）的点，即线性需求曲线的中点。如果它以目标工资为条件最大化会员就业，它会要求更高的工资，但就业由需求曲线决定。

Wage × Employment = Total Wage Bill; where MR = 0 for maximisation

工资 × 就业 = 总工资额；最大化时 MR = 0

In IB and Edexcel exams, you may need to illustrate this using a diagram showing the labour demand curve, the marginal revenue product curve, and possibly the union’s indifference curves reflecting its preferences between wages and employment. The equilibrium wage is above the competitive wage, resulting in a deadweight loss and potential unemployment.

在IB和Edexcel考试中，你可能需要用图表说明，包括劳动力需求曲线、边际收益产品曲线，以及可能反映工会对工资和就业偏好的无差异曲线。均衡工资高于竞争工资，导致无谓损失和潜在失业。

4. The Bilateral Monopoly Model and Negotiation Range | 双边垄断模型与谈判区间

When a union faces a single monopsony employer (a single buyer of labour), the labour market is a bilateral monopoly. This model is often examined because it shows that a union’s wage push need not reduce employment below the competitive level—it can counteract the monopsonist’s tendency to hire too few workers at too low a wage.

当工会面对单一买方垄断雇主（劳动力唯一买方）时，劳动力市场呈现双边垄断。这一模型常被考察，因为它表明工会推动工资上涨未必将就业压至竞争水平以下——它可以抵消买方垄断者以过低工资雇用太少工人的倾向。

In a pure monopsony, the employer equates marginal cost of labour (MCL) with marginal revenue product (MRP) and pays a wage read from the labour supply curve. Under bilateral monopoly, the wage becomes indeterminate within a range bounded by the union’s desired wage (from its monopoly model) and the monopsonist’s profit-maximising wage without the union. The actual outcome depends on negotiating strength.

在纯粹买方垄断下，雇主使劳动力边际成本（MCL）等于边际收益产品（MRP），并根据劳动力供给曲线支付工资。在双边垄断下，工资在一个由工会期望工资（来自其垄断模型）和没有工会时买方垄断利润最大化工资之间的区间内不确定。实际结果取决于谈判实力。

This model is crucial for evaluation: it demonstrates that unions can raise wages and potentially increase employment simultaneously if the initial monopsony equilibrium involved exploiting labour. The key condition is that the union’s target wage lies within the gap between the MRP and the supply curve at the monopsony employment level.

这一模型对评估至关重要：它表明，如果初始买方垄断均衡涉及剥削劳动力，工会可以在提高工资的同时增加就业。关键条件是工会目标工资位于买方垄断就业水平处MRP与供给曲线之间的差距内。

5. Efficiency Wage Theory and Union Influence | 效率工资理论与工会影响

Efficiency wage theory suggests that paying workers above the market-clearing rate can raise productivity by reducing shirking, lowering turnover, and improving morale. Unions may reinforce this mechanism by acting as a ‘voice’ for workers, thereby reducing the need for employers to use high wages as a disciplining device. However, a strong union that enforces high wages can itself serve as the efficiency wage.

效率工资理论认为，支付高于市场出清水平的工资可以通过减少偷懒、降低员工流失率和提高士气来提升生产率。工会可以通过充当工人的“发言渠道”来强化这一机制，从而减少雇主将高工资作为纪律手段的需要。然而，一个强制实施高工资的强工会本身就可以起到效率工资的作用。

In exam analysis, you can link unions to the concept of ‘insider-outsider’ effects: unionised insiders may bargain for wages that keep them in employment but discourage firms from hiring additional workers (outsiders), contributing to structural unemployment. This ties into the hysteresis hypothesis in macroeconomics.

在考试分析中，你可以将工会与“局内人-局外人”效应联系起来：工会化的局内人可能会谈判设定能保住他们工作的工资，但抑制企业雇佣额外工人（局外人），从而加剧结构性失业。这与宏观经济中的滞后假说相关。

6. The Impact of Trade Unions on Employment and Unemployment | 工会对就业和失业的影响

The classic neoclassical prediction is that a union-imposed wage above the competitive equilibrium creates classical (real-wage) unemployment, as the quantity of labour supplied exceeds the quantity demanded. The magnitude depends on the elasticity of labour demand: the more elastic the demand (due to substitution possibilities, price elasticity of product demand, labour’s share of total costs), the larger the employment loss.

经典的新古典学派预测是，工会将工资设定在竞争性均衡之上会造成古典（实际工资）失业，因为劳动力供给量超过需求量。影响大小取决于劳动力需求弹性：需求越富弹性（因替代可能性、产品需求价格弹性、劳动力占总成本份额），就业损失越大。

However, empirical evidence is mixed. In some industries, unions negotiate productivity-enhancing work practices that offset higher wage costs, leaving employment little changed. Furthermore, where product markets are imperfectly competitive, unions may capture a share of monopoly profits without reducing employment significantly, since the firm’s mark-up allows for higher labour costs.

然而，经验证据莫衷一是。在一些行业，工会通过谈判促成提高生产率的工作实践，抵消了更高的工资成本，就业几乎不变。此外，在产品市场不完全竞争的情况下，工会可以攫取一部分垄断利润而不显著减少就业，因为企业的加成定价可吸收较高的劳动力成本。

The collective voice model argues that unions reduce quits and improve worker morale, thereby lowering turnover costs and raising labour productivity, which can sustain higher wages without cutting employment. This is a standard evaluation point in IB Paper 1 and Edexcel essay questions.

集体声音模型认为，工会减少了辞职率并改善工人士气，从而降低员工流失成本并提高劳动生产率，这可以在不削减就业的情况下维持更高工资。这是IB Paper 1和Edexcel论文题中的一个标准评估点。

7. Wage Differentials and the Role of Unions | 工资差异与工会的作用

Unions can create wage differentials between unionised and non-unionised sectors. The union wage premium—the percentage by which union wages exceed non-union wages for comparable workers—reflects the union’s ability to extract rents. Empirical studies often find a premium of 10-20%, though it varies by country, industry, and time period.

工会可以在工会化部门和非工会化部门之间造成工资差异。工会工资溢价——在可比工人中，工会工资超过非工会工资的百分比——反映了工会攫取租金的能力。经验研究通常发现溢价在10-20%之间，尽管会因国家、行业和时间段而异。

This wage gap can be explained by two main theories: (i) unions redistribute economic rents from capital to labour, and (ii) unions select high-productivity firms to organise, making the premium partly reflect firm-specific effects rather than union power alone. Examiners appreciate the ability to distinguish correlation from causation here.

这种工资差距可以用两个主要理论解释：(i) 工会将经济租金从资本重新分配给劳动力；(ii) 工会选择高生产率企业进行组织，使得溢价部分反映了企业特定效应，而不仅仅是工会力量。考官欣赏在这里区分相关性与因果性的能力。

Additionally, unions tend to compress wage differentials within firms by negotiating standardised pay scales, reducing wage inequality among their members. This has implications for income distribution and social equity, a common argument in favour of labour market intervention.

此外，工会倾向于通过谈判制定标准化工资等级来压缩企业内部的工资差异，从而减少其成员之间的工资不平等。这对收入分配和社会公平产生影响，是支持劳动力市场干预的常见论点。

8. The Effect of Trade Unions on Productivity and Efficiency | 工会对生产率和效率的影响

The relationship between unions and productivity is ambiguous. The ‘shock effect’ hypothesis suggests that higher wages force management to become more efficient by adopting better technology, reorganising work, or investing in human capital. In contrast, restrictive labour practices (e.g., featherbedding, demarcation rules) and costly strikes can reduce productivity.

工会与生产率之间的关系是模糊的。“冲击效应”假说认为，更高的工资迫使管理层变得更有效率，通过采用更好的技术、重组工作或投资人力资本。相反，限制性劳动惯例（例如超额雇工、分工界限）和代价高昂的罢工会降低生产率。

On balance, studies often find that unionised firms exhibit higher labour productivity, but profitability may be lower because unionised workers capture a larger share of the value added. This means union effects on allocative efficiency (via employment levels) can be negative even if productive efficiency improves. You must show this nuanced evaluation in high-scoring answers.

总体而言，研究通常发现工会化企业表现出更高的劳动生产率，但利润率可能较低，因为工会工人攫取了更大份额的增值。这意味着，即使生产效率提高，工会对配置效率（通过就业水平）的影响也可能是负面的。你必须在高分回答中展示这种细致的评估。

Productive efficiency is achieved when output is produced at minimum average cost. If unions introduce restrictive practices, the average cost curve shifts upward, increasing X-inefficiency. Conversely, if unions facilitate training and cooperation, the cost curve can shift downward. Always consider the counterbalance.

生产效率在产出以最低平均成本生产时实现。如果工会引入限制性惯例，平均成本曲线向上移动，加剧X无效率。反之，如果工会促进培训和合作，成本曲线可以向下移动。始终要考虑平衡。

9. Union Wage Bargaining and Inflation | 工会工资谈判与通货膨胀

At the macroeconomic level, strong trade unions can contribute to cost-push inflation if they demand wage increases that outstrip productivity growth. This is often modelled using the wage-price spiral: unions push for higher nominal wages to protect real incomes, firms pass on the higher costs as rising prices, which in turn triggers further wage demands.

在宏观经济层面，强大的工会如果要求的工资增长超过生产率增长，就可能促成成本推动型通胀。这通常用工资-价格螺旋来建模：工会推动提高名义工资以保护实际收入，企业将增加的负担以更高的价格转嫁出去，这反过来又引发进一步的工资要求。

In the short-run Phillips curve framework, a powerful union sector can keep the natural rate of unemployment (NAIRU) higher because insiders enforce a real wage floor that leaves more outsiders unemployed. This shifts the short-run Phillips curve to the right, implying a worse trade-off between inflation and unemployment.

在短期菲利普斯曲线框架中，一个强大的工会部门可以使自然失业率（NAIRU）更高，因为局内人维持实际工资下限，导致更多局外人失业。这将短期菲利普斯曲线向右移动，意味着通胀与失业之间的权衡恶化。

However, if unions exercise wage moderation under social partnership agreements (as in some Northern European countries), they can help maintain international competitiveness and low inflation. Contextual knowledge about different industrial relations systems can boost your evaluation marks.

然而，如果工会在社会伙伴关系协议下实行工资节制（如某些北欧国家），它们可以帮助维持国际竞争力和低通胀。对不同产业关系体系的背景知识可以提升你的评估分数。

10. Government Policies and Legislation Affecting Trade Unions | 影响工会的政府政策与立法

Government attitudes towards trade unions range from supportive to restrictive. Legislation can determine union rights to recognition, strike action, picketing, and the legal enforcement of closed shops. In the UK, the Trade Union Acts of the 1980s reduced union power by requiring secret ballots before strikes and banning secondary action, lowering union density significantly.

政府对工会的态度从支持到限制不一而足。立法可以决定工会在认可、罢工行动、纠察以及只雇用工会会员做法的法律执行方面的权利。在英国，1980年代的工会法案通过在罢工前要求无记名投票并禁止次级行动，显著削弱了工会力量，降低了工会密度。

From a competition policy perspective, unions are sometimes seen as labour market cartels that restrict competition. However, under international labour standards (ILO conventions), the freedom of association and the right to collective bargaining are fundamental rights, reflecting the view that labour is not a commodity.

从竞争政策的角度看，工会有时被视作限制竞争的劳动力市场卡特尔。然而，根据国际劳工标准（国际劳工组织公约），结社自由和集体谈判权是基本权利，这反映了劳动力不是商品的理念。

In essay questions, you may be asked to evaluate the desirability of laws that restrict union power. You can balance arguments about economic efficiency, foreign direct investment, and labour market flexibility against considerations of income inequality, worker exploitation, and democratic voice at work.

在论文题中，你可能会被要求评估限制工会权力的法律的可取性。你可以将经济效率、外国直接投资和劳动力市场灵活性的论点，与收入不平等、工人剥削和工作场所民主发声的考量相平衡。

11. Trade Unions in Imperfectly Competitive Product Markets | 不完全竞争产品市场中的工会

When firms possess monopoly or oligopoly power in their product market, the presence of a union can change the distribution of supernormal profits. Instead of earnings going entirely to shareholders, a strong union can capture a share for workers through higher wages, leaving the total employment effect less negative than in perfectly competitive markets.

当企业在其产品市场拥有垄断或寡头势力时，工会的存在可以改变超额利润的分配。超级利润不再完全归于股东，一个强大的工会可以通过提高工资为工人攫取一部分，从而使得总就业效应较之完全竞争市场不那么负面。

This is because the firm’s demand for labour is derived from its marginal revenue product curve. Under monopoly, the MRP curve is more inelastic than under perfect competition due to steeper product demand curves, so a given wage increase reduces employment by a smaller amount. This nuance is essential for advanced analysis.

这是因为企业的劳动力需求源自其边际收益产品曲线。在垄断条件下，由于产品需求曲线更陡峭，MRP曲线比完全竞争时更缺乏弹性，因此给定的工资增长减少的就业量更小。这一细微之处对高级分析至关重要。

A common diagrammatic approach involves showing a kinked demand curve for labour or a gap between the value of marginal product and marginal revenue product. Unions can therefore extract some of the monopoly rent without eliminating it entirely, which may improve equity without severely harming allocative efficiency.

常见的图形方法包括显示劳动力需求曲线的弯折，或边际产品价值与边际收益产品之间的差距。因此，工会可以提取部分垄断租金而不完全消除它，这可能在改善公平的同时不会严重损害配置效率。

12. Evaluating the Role of Trade Unions in the 21st Century | 评估工会在21世纪的角色

The decline in union membership in many advanced economies over recent decades—linked to deindustrialisation, the rise of the gig economy, and globalisation—has raised questions about the continued relevance of trade unions. Yet, unions are adapting: there is growing unionisation in the service sector, the platform economy, and among freelance workers.

近几十年来，许多发达经济体工会会员减少——与去工业化、零工经济的兴起和全球化相关——引发了关于工会持续相关性的问题。然而，工会正在适应：服务行业、平台经济和自由职业者中的工会化程度正在增长。

Technology also cuts both ways. Automation threatens routine jobs that were highly unionised, while digital platforms facilitate new forms of collective action. The COVID-19 pandemic highlighted job insecurity, sparking renewed interest in union protection. In your essays, always incorporate recent trends to show contemporary understanding.

技术也是一把双刃剑。自动化威胁到高度工会化的常规工作岗位，而数字平台则促进了新型集体行动。新冠疫情凸显了工作不安全感，激发了人们对工会保护的新兴趣。在你的论文中，要始终融入最新趋势以展示对当代的理解。

Ultimately, the welfare effect of trade unions cannot be judged purely by neoclassical employment models. Institutional, social, and political dimensions matter. Unions can reduce exploitation, increase labour’s share of national income, and provide a countervailing power to multinational corporations. Whether they improve overall welfare depends on the balance of these forces within a specific institutional context.

归根结底，工会的福利效应不能仅凭新古典就业模型来评判。制度、社会和政治维度同样重要。工会可以减少剥削，提高劳动在国民收入中的份额，并对跨国公司提供制衡力量。它们是否改善总体福利取决于这些力量在特定制度背景下的平衡。

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Trade Unions in Economics | 工会考点精讲