📚 Wage Determination in the Labour Market | 劳动力市场中的工资决定
The wage rate, the price of labour, is determined by the interaction of demand and supply in the labour market. However, unlike goods markets, labour services are inseparable from the worker, making wage determination a complex process influenced by productivity, bargaining power, institutional factors and government intervention. Both IB and CIE Economics syllabuses require a solid understanding of the theory of marginal productivity, the role of trade unions, the impact of minimum wages and the causes of wage differentials. This revision guide unpacks these core concepts with bilingual precision to support exam success.
工资率，即劳动力的价格，是由劳动力市场中需求与供给的相互作用决定的。然而，与商品市场不同，劳动服务无法与劳动者分离，因此工资决定受到生产率、议价能力、制度因素和政府干预等多重影响的复杂过程。IB 和 CIE 经济学的教学大纲都要求学生扎实掌握边际生产力理论、工会的作用、最低工资的影响以及工资差异的成因。本复习指南以双语方式精细剖析这些核心概念，助力考试成功。
1. The Labour Market: A Derived Demand Perspective | 劳动力市场：派生需求视角
The demand for labour is a derived demand, meaning it originates from the demand for the goods and services that labour produces. Firms hire workers not for their own sake but to satisfy consumer demand. When the demand for a final product rises, the firm’s need for labour to produce that product increases as well. Conversely, a fall in product demand will reduce the demand for workers. This linkage is fundamental to understanding fluctuations in employment and wages across different industries.
劳动力需求是一种派生需求，即它源于对劳动力所生产的商品和服务的需求。企业雇佣工人不是为了工人本身，而是为了满足消费者需求。当最终产品的需求上升时，企业为生产该产品而对劳动力的需求也会增加。反之，产品需求下降将减少对工人的需求。这一联系是理解不同行业就业和工资波动的基石。
The concept of derived demand also highlights that anything affecting product market conditions, such as changes in consumer tastes, technology or the price of substitute goods, will indirectly shift the labour demand curve. Therefore, when analysing wage determination, we must always consider the product market first.
派生需求的概念还表明，任何影响产品市场状况的因素，例如消费者偏好的变化、技术变革或替代品的价格，都会间接移动劳动力需求曲线。因此，在分析工资决定时，我们必须首先考虑产品市场。
2. Demand for Labour and the Marginal Revenue Product Theory | 劳动力需求与边际收益产品理论
In a perfectly competitive labour market, a profit-maximising firm will hire labour up to the point where the marginal cost of labour (MCL) equals the marginal revenue product of labour (MRP). The MRP is the extra revenue generated from employing one additional unit of labour, calculated as the marginal physical product of labour (MPP) multiplied by the marginal revenue (MR) from selling the extra output.
在完全竞争的劳动力市场中，追求利润最大化的企业会一直雇佣劳动力，直到劳动力的边际成本（MCL）等于劳动力的边际收益产品（MRP）。MRP 是额外雇佣一单位劳动力所增加的收益，等于劳动力的边际物质产品（MPP）乘以出售额外产出的边际收益（MR）。
MRP = MPP × MR
Under perfect competition in the product market, the firm is a price taker, so marginal revenue equals the market price of the good. Thus, MRP = MPP × P. This is also called the value of the marginal product (VMP). In imperfectly competitive product markets, MR is less than price, so MRP is lower than VMP, and the labour demand curve is steeper.
如果产品市场是完全竞争的，企业是价格接受者，那么边际收益等于商品的市场价格。因此，MRP = MPP × P，这也被称为边际产品价值（VMP）。在不完全竞争的产品市场中，MR 小于价格，所以 MRP 低于 VMP，劳动力需求曲线也更陡峭。
The MRP curve is downward-sloping because of diminishing marginal returns: as more labour is hired, the marginal product eventually falls, reducing MRP. In a competitive labour market, the firm’s supply of labour is perfectly elastic at the market wage, so MCL equals the wage rate. The firm’s equilibrium employment is where MRP = wage.
由于边际报酬递减规律，随着雇佣劳动的增加，边际产品最终会下降，从而降低 MRP，所以 MRP 曲线向下倾斜。在竞争性劳动力市场中，企业面临的劳动力供给具有完全弹性，即市场工资水平，因此 MCL 等于工资率。企业的均衡雇佣量在 MRP = 工资处。
3. Determinants of Labour Demand | 劳动力需求的决定因素
Several factors can shift the whole MRP curve, altering the demand for labour at any given wage. A change in labour productivity, driven by better technology or education, raises MPP and shifts the MRP curve to the right. An increase in the price of the final product, perhaps due to higher demand, also increases MRP and shifts labour demand outward. The availability and cost of substitute factors, such as capital, play a role: if machines become cheaper, firms may replace labour, reducing labour demand. Complementary factors like managerial skills can enhance labour productivity and increase labour demand.
若干因素能够移动整条 MRP 曲线，从而在任何给定的工资水平上改变劳动力需求。由更好技术或教育推动的劳动生产率提高会提升 MPP，并使 MRP 曲线向右移动。最终产品价格上升——或许由于需求增加——也会增加 MRP，使劳动力需求向外移动。替代要素（如资本）的可获得性和成本也会产生影响：若机器变得更便宜，企业可能用资本替代劳动力，降低劳动力需求。而管理技能等互补要素则能提高劳动生产率，增加劳动力需求。
Additionally, the demand for the final product itself depends on income, tastes and expectations, so all these can indirectly shift labour demand. In IB and CIE exams, students must be able to distinguish between a movement along the labour demand curve (caused by a change in wage rate) and a shift of the curve (caused by changes in the determinants above).
此外，最终产品本身的需求依赖于收入、偏好和预期，因此所有这些因素都可能间接移动劳动力需求。在 IB 和 CIE 的考试中，学生必须能够区分沿劳动力需求曲线的移动（由工资率变化引起）和需求曲线的平移（由上述决定因素的变化引起）。
4. Supply of Labour in Individual and Market Contexts | 个人与市场背景下的劳动力供给
The supply of labour refers to the total number of hours that workers are willing and able to work at a given wage rate. For an individual, the labour supply decision involves a trade-off between work and leisure. The substitution effect of a wage increase tends to raise the quantity of labour supplied because the opportunity cost of leisure rises. However, the income effect of higher wages may lead workers to choose more leisure, as they can maintain their standard of living with fewer working hours. The individual labour supply curve can therefore be backward-bending at higher wage levels.
劳动力供给指在给定的工资率下，劳动者愿意且能够工作的总小时数。对个人而言，劳动力供给决策涉及工作与闲暇的权衡。工资上涨的替代效应倾向于增加劳动力供给量，因为闲暇的机会成本上升了。然而，工资上升的收入效应则可能使劳动者选择更多闲暇，因为他们可以用更少的工作时间维持生活水平。因此，个人的劳动力供给曲线在较高工资水平上可能向后弯曲。
The market supply of labour for a particular occupation or industry is normally upward-sloping, reflecting that higher wages attract more workers from other industries or from non-participation. The elasticity of labour supply depends on factors such as the time required for training, geographical mobility and the availability of close substitutes for the occupation.
某一职业或行业的市场劳动力供给通常向右上方倾斜，这反映出较高的工资能吸引其他行业或原来不参与劳动的人进入。劳动力供给弹性取决于培训所需时间、地理流动性以及该职业的近似替代职业的可得性等因素。
5. Determinants of Labour Supply | 劳动力供给的决定因素
Non-wage considerations are crucial in shaping labour supply. The size of the working-age population and its growth rate affect the total pool of labour. Labour force participation rates, influenced by cultural attitudes, family responsibilities and retirement ages, determine how many of those able to work actually seek employment. Changes in education and training levels can shift the supply of skilled versus unskilled labour.
非工资因素在塑造劳动力供给方面至关重要。劳动适龄人口规模及其增长率影响着劳动力总量。受文化观念、家庭责任和退休年龄影响的劳动力参与率，决定了具备劳动能力的人中有多少人实际寻求就业。教育和培训水平的变化则会移动技能型劳动力与非技能型劳动力的供给。
Government policies, such as welfare benefits and income taxes, also affect labour supply at the margin. Higher benefits can reduce the incentive to take low-paid jobs, while high marginal tax rates may discourage additional work effort. In a globalised world, net migration flows significantly alter the supply of labour in particular sectors, making this a common policy discussion topic in IB Economics.
政府政策，如福利补助和所得税，也在边际上影响劳动力供给。较高的福利会降低从事低薪工作的激励，而高边际税率则可能抑制额外的工作努力。在全球化的世界中，净移民流动显著改变特定行业的劳动力供给，这使其成为 IB 经济学中常见的政策讨论话题。
6. Equilibrium Wage in a Perfectly Competitive Labour Market | 完全竞争劳动力市场的均衡工资
In a perfectly competitive labour market, there are many small buyers (firms) and sellers (workers), no barriers to entry, and perfect information. The equilibrium wage is determined by the intersection of the market demand for labour and the market supply of labour. At this wage, the quantity of labour demanded equals the quantity supplied, so there is no involuntary unemployment in the classical sense.
在完全竞争的劳动力市场中，存在众多小规模买方（企业）和卖方（劳动者），无进出壁垒，且信息完全。均衡工资由市场劳动力需求与市场劳动力供给的交点决定。在该工资水平上，劳动力需求量等于供给量，因此不存在古典意义上的非自愿失业。
Each individual firm is a wage taker and faces a horizontal supply curve at the market wage. Its employment decision is solely based on MRP = wage. If the market wage falls, firms move down along their MRP curves and hire more labour. If market supply or demand shifts, the equilibrium wage changes accordingly, leading to clear distributive effects: higher wages improve workers’ incomes but raise production costs for firms.
单个企业是工资接受者，面临在市场工资水平上的水平供给曲线。其雇佣决策仅基于 MRP = 工资。如果市场工资下降，企业沿着各自的 MRP 曲线下行并雇佣更多劳动力。如果市场供给或需求移动，均衡工资随之变化，并产生清晰的分配效应：较高的工资提升劳动者收入，但会提高企业的生产成本。
7. Monopsony and Imperfect Labour Markets | 买方垄断与不完全劳动力市场
Monopsony exists when there is only one buyer of labour in a market, or a dominant employer with significant market power. Unlike a competitive firm, a monopsonist faces the whole upward-sloping market supply curve. To hire an extra worker, the firm must raise the wage not only for the new worker but typically for all existing workers as well. Hence, the marginal cost of labour (MCL) lies above the supply curve.
买方垄断存在于市场上只有一个劳动力购买者或一个具有重大市场影响力的主导雇主时。与竞争性企业不同，买方垄断者面临整条向上倾斜的市场供给曲线。要雇佣一名额外劳动者，企业不仅需要为新工人提高工资，通常还必须为所有现有工人加薪。因此，劳动力的边际成本（MCL）位于供给曲线之上。
A profit-maximising monopsonist hires where MRP = MCL, but pays a wage determined by the supply curve at that employment level. This results in a lower wage and lower employment than under perfect competition. Workers are exploited in the sense that they are paid less than their MRP. Monopsony power can arise due to geographical isolation, occupational specialisation or tacit collusion among employers.
追求利润最大化的买方垄断者会在 MRP = MCL 处决定雇佣量，但支付的工资由该雇佣量对应的供给曲线决定。这导致与完全竞争相比更低的工资和更低的雇佣量。劳动者受到了剥削，因为他们的工资低于其 MRP。买方垄断力量可能源于地理隔绝、职业专门化或雇主间的默契合谋。
8. Trade Unions and Their Impact on Wages | 工会及其对工资的影响
Trade unions are organisations of workers that bargain collectively with employers to improve wages, working conditions and job security. In a competitive labour market, a union may attempt to raise the wage above equilibrium by either restricting labour supply (e.g., through closed shops or long apprenticeships) or by directly negotiating a higher wage floor. If the union succeeds in pushing the wage up to Wu, the quantity of labour demanded contracts, potentially causing unemployment among those who would be willing to work at that higher wage.
工会是劳动者组成的组织，通过集体谈判与雇主协商，以改善工资、工作条件和职业保障。在竞争性劳动力市场中，工会可能试图通过限制劳动供给（例如只雇佣工会会员或长期学徒制）或直接协商更高的工资下限，将工资提升到均衡水平之上。若工会成功将工资推高到 Wu，劳动力需求量将收缩，可能导致那些愿意在该较高工资水平工作的人失业。
However, the impact of unions depends on the market structure. Under monopsony, a union setting a wage floor can actually increase both wages and employment, up to the competitive equilibrium level, by counterbalancing employer power. Moreover, unions may help to raise productivity through better training and worker morale, shifting the MRP curve rightwards and justifying higher pay without causing job losses. CIE exams often ask students to evaluate these contrasting effects.
然而，工会的影响取决于市场结构。在买方垄断下，工会设定工资下限实际上可以同时提高工资和就业量，直至竞争性均衡水平，以此制衡雇主力量。此外，工会还能通过更好的培训和劳动者士气提高生产率，使 MRP 曲线右移，从而在避免失业的同时支撑更高工资。CIE 考试常常要求学生评估这些对比效应。
9. Minimum Wage Legislation | 最低工资立法
A national minimum wage is a legal floor set by the government below which employers cannot pay. In a standard competitive labour market diagram, a binding minimum wage set above the equilibrium creates a surplus of labour—classical unemployment. The higher wage encourages more people to enter the workforce (increased quantity supplied) while firms reduce their demand for labour. The resulting unemployment depends on the elasticity of demand and supply.
全国最低工资是由政府设定的法定工资下限，雇主不得支付低于此标准的工资。在标准的竞争性劳动力市场图表中，一个高于均衡水平的有效最低工资会造成劳动供给过剩——即古典失业。较高的工资鼓励更多人进入劳动力队伍（供给量增加），而企业则减少劳动力需求。由此产生的失业幅度取决于需求与供给的弹性。
In monopsonistic markets, a carefully set minimum wage can raise wages and employment simultaneously, because the MCL curve becomes horizontal at the minimum wage up to the point where it intersects supply. Thus, the monopsonist becomes a wage taker within that range and hires more workers. The evaluation of minimum wage policy must also consider potential effects on small businesses, youth employment and international competitiveness.
在买方垄断市场中，一个精心设定的最低工资可以同时提高工资和就业，因为在最低工资水平直到与供给曲线相交之前，MCL 曲线变为水平线。此时买方垄断者在相应区间内成为工资接受者，并雇佣更多工人。对最低工资政策的评估还必须考虑其对小企业、青年就业和国际竞争力的潜在影响。
10. Wage Differentials: Causes and Consequences | 工资差异：原因与后果
Wage differentials refer to the differences in wages between different occupations, industries, regions or demographic groups. Compensating differentials arise when jobs with higher risks, unpleasant working conditions or unsocial hours pay more to attract workers. Human capital differences, such as variations in education, training and experience, lead to higher productivity and thus higher MRP for skilled workers, causing wage gaps.
工资差异指不同职业、行业、地区或人口群体之间的工资差别。补偿性差异产生于高风险、恶劣工作条件或非正常工作时间等岗位需支付更高工资以吸引劳动者。人力资本差异，例如教育、培训和工作经验的不同，导致生产率进而更高，使得技能劳动者 MRP 更高，从而形成工资差距。
Labour market imperfections, including discrimination, lack of information, and monopsony power, can also generate persistent wage gaps that are not justified by productivity. For example, gender pay gaps may partly reflect differences in career interruptions and occupational segregation, but can also indicate discriminatory practices. In IB and CIE, candidates are expected to discuss policies such as equal pay legislation and investment in education to reduce undesirable differentials.
劳动力市场的不完善，包括歧视、信息缺乏和买方垄断力量，也可能产生持久的、非由生产率悬殊造成的工资差距。例如，性别薪酬差距可能部分反映职业中断和职业隔离的差异，但也可能表明歧视性做法。在 IB 和 CIE 考试中，考生应讨论如平等薪酬立法和教育投入等政策以减少不合理的差异。
11. Elasticity of Labour Demand and Supply with Policy Implications | 劳动需求与供给弹性及其政策启示
The wage elasticity of labour demand measures the responsiveness of the quantity of labour demanded to a change in the wage rate. If labour can be easily substituted by capital (high elasticity of substitution), or if the product demand is price elastic, labour demand will be more elastic. A highly elastic labour demand means that a given wage increase due to union pressure or a minimum wage will cause a relatively larger fall in employment.
劳动力需求的工资弹性衡量劳动力需求量对工资率变化的反应程度。如果劳动力容易被资本替代（替代弹性高），或者产品需求的价格弹性大，那么劳动力需求就更具弹性。高度弹性的劳动力需求意味着，由工会压力或最低工资引起的给定工资上涨会导致相对更大的就业减少。
The elasticity of labour supply also matters: inelastic supply (e.g., neurosurgeons) allows wages to rise sharply in response to demand increases without a large increase in quantity, whereas elastic supply means that small wage differentials can reallocate many workers. These elasticities are key to evaluating the effectiveness of minimum wages, taxation and subsidy policies. In CIE data-response questions, candidates often calculate or interpret elasticity values to support analysis.
劳动力供给的弹性同样重要：供给缺乏弹性（如神经外科医生）时，需求增加会导致工资大幅上升而供给量增加不大；而富有弹性的供给意味着微小的工资差异就能重新配置大量工人。这些弹性是评估最低工资、税收和补贴政策有效性的关键。在 CIE 的数据应答题中，考生经常计算或解读弹性数值以支撑分析。
12. Evaluating Wage Determination Theories | 工资决定理论的评估
While the marginal productivity theory provides a coherent explanation of long-run wage determination, it has limitations. In the real world, labour markets are rarely perfectly competitive, and firms may not be able to precisely measure MRP, especially in team-based productions. Institutional factors, such as collective bargaining, internal labour markets and efficiency wage theories, add complexity. Efficiency wage theory suggests that firms may voluntarily pay above the market-clearing wage to boost worker effort, reduce turnover and attract higher-quality applicants, thereby shifting the MRP curve itself.
虽然边际生产力理论对长期工资决定提供了条理清晰的解释，但有其局限性。在现实世界中，劳动力市场极少是完全竞争的，企业可能无法精确衡量 MRP，尤其是在团队生产中。制度因素，如集体谈判、内部劳动力市场和效率工资理论，使情况更为复杂。效率工资理论表明，企业可能自愿支付高于市场出清的工资，以激发员工努力、降低流动率并吸引更高质量的求职者，从而移动 MRP 曲线本身。
Changes in technology, globalisation and the gig economy are challenging traditional models. Platform work often blurs the line between employment and self-employment, complicating the calculation of MRP and the supply decision. As a result, IB and CIE syllabuses require students to go beyond simple diagrams and discuss real-world examples to demonstrate evaluative skills. A nuanced conclusion might acknowledge that wage determination is a blend of market forces, institutional rules and behavioural factors.
技术变革、全球化和零工经济正在挑战传统模型。平台工作常常模糊雇佣与自雇的界限，使 MRP 的计算和供给决策更为复杂。因此，IB 和 CIE 的教学大纲要求学生超越简单的图形，讨论现实世界的例子以展示评价能力。一个细致的结论可以承认，工资决定是市场力量、制度规则和行为因素的结合。
Published by TutorHao | Economics Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导