IB Economics Guide To The Labour Market
Master IB Economics labour market theory with real examples from UK, US & EU. Understand wages, unemployment & minimum wage like never before!
IB ECONOMICS HLIB ECONOMICS MACROECONOMICSIB ECONOMICSIB ECONOMICS SL
Lawrence Robert
6/7/202510 min read
Labour Markets and Wages in IB Economics: Why Some Workers Earn Millions and Others Earn Minimum Wage
Target Question:
How are wages determined in IB Economics?
Erling Haaland earns approximately £525,000 per week at Manchester City. A newly qualified teacher in England earns around £31,000 per year. Both are skilled professionals. Both work long hours. Both can be regarded as very good at their jobs. So why is one paid roughly 1400 times more than the other?
The answer lies in labour market theory. Understanding labour market theory it is not just useful for your IB Economics exam. It explains the structure of pay across every job, sector, and economy you will come across in your working life.
IB Economics Definition - The Labour Market:
The labour market is the market in which households supply labour services to firms, which demand labour as a factor of production. The equilibrium wage is determined by the interaction of labour supply and labour demand, and - like all markets - shifts when the underlying conditions on either side change.
IB Economics Market Equilibrium - Full Guide →
Labour Markets Work Differently From Goods Markets
Some of my students often forget that labour markets do not work in the same way as goods markets. In markets for goods, firms are the suppliers and households are the demanders. In labour markets, this is reversed: households supply labour and firms demand it. The wage is the price.
This is relevant for our analysis because it changes which side of the market holds the analytical weight for different questions. When you are asked why wages rose in the construction sector, you are being asked about what shifted, either the demand for construction workers (more housebuilding projects, perhaps) or the supply of them (fewer workers with the right skills). So, the price e.g. the wage itself did not cause the shift - the wage is the outcome of it.
Useful content notes on IB Economics The Division of Labour - Full Guide →
Labour Demand: Why Firms Hire
IB Economics Definition - Derived Demand for Labour:
The demand for labour is a derived demand - it arises not from the direct value of labour itself, but from the value of the goods and services that labour produces. Firms hire workers because workers produce output that can be sold, not as an end in itself.
This concept determines how firms decide how many workers to hire. A profit-maximising firm will employ additional workers up to the point where the extra revenue generated by one more worker - the marginal revenue product of labour - equals the wage paid to that worker. Hiring beyond that point means paying more for a worker than that worker generates in revenue. Hiring fewer workers means leaving profitable opportunities on the table.
IB Economics Definition - Marginal Revenue Product (MRP):
The marginal revenue product of labour is the additional revenue a firm earns from employing one more unit of labour. It is calculated as the marginal product of labour multiplied by the price of the output. In a competitive labour market, the profit-maximising firm hires up to the point where MRP equals the wage rate.
This is why Haaland earns £525,000 per week. Manchester City's accountants can demonstrate - through shirt sales, matchday revenue, television rights, and sponsorship premiums - that Haaland's presence generates revenue comfortably in excess of his wage. His MRP exceeds his wage, making him, in strict economic terms, worth every penny.
A newly qualified teacher, by contrast, works in a sector where output is not sold at a market price - education is largely publicly funded and subsidised - and where the revenue generated per worker cannot be measured in the same way. This is one structural reason why public sector wages tend to be lower than private sector wages in occupations requiring similar skills: the MRP framework has less traction where market prices do not operate.
The labour demand curve slopes downward because of diminishing marginal returns: as a firm employs more workers with a fixed stock of capital, the additional output of each successive worker falls, and so does the MRP associated with hiring them. (Source: IB Economics Diagrams)
What shifts labour demand? Not the wage - that moves along the curve. The curve itself shifts when:
The price of the firm's output changes (higher output prices raise MRP, shifting demand right)
Worker productivity changes through human capital investment or new technology (raising MRP)
The prices of other factors change - if capital becomes cheaper, firms may substitute capital for labour, shifting labour demand left
Labour Supply: Why People Work
The individual labour supply curve has an unusual shape in economic theory - it can bend backwards when wage levels are high enough. When wages are low, a higher wage induces more hours of work (the substitution effect dominates here: work is now more attractive relative to leisure). But beyond a certain wage level, workers may choose to work fewer hours because they can afford the same income with less effort (the income effect dominates). For most IB Economics purposes, however, the labour supply curve slopes upward.
What shifts labour supply? Not the wage, let's remember this. The curve shifts when:
Population changes - net immigration, for example, increases the supply of labour in specific markets. The departure of EU workers from UK hospitality and agriculture following Brexit is a clean example of a leftward supply shift in those sectors
Participation rates change - more women entering the workforce over recent decades produced a sustained rightward shift in aggregate labour supply
Education and training levels change - longer periods in education temporarily reduce labour supply but raise the quality of supply when workers eventually enter the market
Non-wage conditions change - improvements in working conditions, flexibility, or job security make a given occupation more attractive, shifting supply right
Wage Determination and Wage Differentials
In a competitive labour market, the equilibrium wage is set where supply equals demand. At wages above equilibrium, a labour surplus results - more workers seek employment than firms wish to hire. At wages below equilibrium, a labour shortage develops - firms cannot fill the positions they need.
IB Economics Definition - Wage Differentials:
Wage differentials are differences in wages between workers, occupations, industries, or regions. They arise from differences in marginal revenue product, human capital, working conditions, trade union power, geographical immobility, and labour market discrimination.
The MRP framework explains the most fundamental source of wage differentials: workers whose labour generates more revenue for their employer command higher wages. But several additional factors account for the wage gaps we can observe in real labour markets:
Human capital differences - workers with higher levels of education and skills have higher productivity and therefore higher MRP. The wage premium for a degree relative to secondary education reflects this, though it varies considerably by subject and sector.
Compensating differentials - unpleasant, dangerous, or unsociable work commands a wage premium to attract workers who could otherwise work in more comfortable conditions. Night shift premiums and hazard pay are straightforward examples.
Trade union power - unionised workers can collectively negotiate wages above the competitive equilibrium. The trade-off is that above-equilibrium wages reduce the quantity of labour demanded, so union wage gains may come at the cost of employment in the sector.
Geographical immobility - workers who cannot or will not move between regions remain trapped in lower-wage local labour markets even when higher wages are available elsewhere. Regional wage differentials in the UK - with London and the South East persistently above Wales, the North East, and Northern Ireland - partly reflect this immobility.
Labour market discrimination - where equally productive workers are paid differently on the basis of gender, ethnicity, or other protected characteristics, wages diverge from their MRP-determined level. The IB Economics syllabus distinguishes between employer discrimination (firms directly paying less) and pre-market discrimination (unequal access to education and training that reduces the human capital of certain groups before they enter the workforce).
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Minimum Wage: A Price Floor in the Labour Market
IB Economics Definition - Minimum Wage:
A minimum wage is a legally mandated price floor in the labour market, set above the equilibrium wage. It prevents wages from falling below the legal minimum, causing the quantity of labour supplied to exceed the quantity demanded - resulting in a surplus of labour, equivalent to unemployment.
The minimum wage is one of the most examined government interventions in IB Economics because its effects are contested and the evaluation available is genuinely rich.
IB Economics The Minimum Wage - Full Guide →
The standard economic prediction follows directly from the price floor analysis: a minimum wage set above the equilibrium wage creates a labour surplus - more workers are willing to work at the minimum wage than employers are willing to hire at that price. The diagram shows unemployment equal to the gap between quantity supplied and quantity demanded at the minimum wage.
In the UK, the National Living Wage for workers aged 21 and over was set at £12.21 per hour from April 2025 - a substantial increase from the £6.50 rate that applied a decade earlier. Classical economics theory would predict rising unemployment from successive minimum wage increases. however, the evidence available is less emphatic.
There are several factors that explain why moderate minimum wage increases often produce smaller employment losses contrary to what simple diagrams predict:
Monopsony power - in labour markets where a single large employer (or a small number of dominant employers) faces many workers, the employer has wage-setting power analogous to a monopoly seller. In this case, a minimum wage can actually increase both wages and employment simultaneously, correcting the monopsony distortion
Efficiency wages - higher wages may reduce turnover and raise worker morale and productivity, partially or fully compensating the cost to employers
Demand stimulus - minimum wage workers spend a high proportion of their income immediately, generating multiplier effects that partially offset the employment loss
Accurate IB Economics evaluation acknowledges both sides: minimum wages can meaningfully raise incomes for low-paid workers, but the employment effect depends on how far above equilibrium the floor is set, the elasticity of labour demand in the affected sectors, and the degree of employer market power. A minimum wage set just above equilibrium in a competitive labour market with elastic demand will have different effects if the set is placed far above equilibrium in a monopsonist market.
IB Economics The Minimum Wage Debate - Full Guide →
Trade Unions in the Labour Market
Trade unions represent workers collectively in wage negotiations with employers. By acting as a single bargaining unit rather than individual workers competing against each other, unions can negotiate wages above the competitive equilibrium - a process called collective bargaining.
IB Economics analysis of trade unions involves the same trade-off as the minimum wage: higher union wages raise incomes for employed union members but reduce the quantity of labour demanded, potentially at the expense of employment in the sector. Unions may also improve productivity by reducing costly labour turnover and providing a structured channel for workplace communication - which partially offsets the employment cost of higher wages.
Trade union density - the share of workers who are union members - varies substantially across economies, from around 65% in Iceland and Denmark to approximately 23% in the UK and under 10% in some Eastern European economies. These differences in union power contribute to the wage distribution patterns observed across countries.
Labour Markets and Unemployment: The Policy Trade-Off
The structure of labour market institutions helps explain differences in unemployment rates across countries - this is a recurring theme in IB Economics Paper 2 data response questions.
Economies with more flexible labour markets - easier hiring and dismissal, less generous unemployment benefits, lower minimum wages relative to median wages - tend to achieve lower unemployment rates because the cost and risk of hiring is lower for employers. The UK unemployment rate of approximately 4.5% reflects flexible labour market arrangements.
Economies with stronger employment protection, more generous benefits, and higher union density tend to have lower wage inequality but higher unemployment - particularly long-term unemployment. Workers in protected positions are better off; workers outside those positions face a harder path into employment.
The IB Economics examiner expects students to identify this trade-off explicitly: labour market flexibility reduces unemployment at the cost of higher wage inequality; labour market rigidity reduces inequality at the cost of higher unemployment. Neither outcome is superior - it is a genuine normative economics question about what a society values.
IB Economics Unemployment Hub Page - Full Guide →
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Frequently Asked Questions - Labour Markets and Wages (IB Economics)
How are wages determined in IB Economics?
In IB Economics, wages are determined by the interaction of labour supply and labour demand in competitive labour markets. The equilibrium wage is the wage at which the quantity of labour supplied equals the quantity demanded. In practice, wages are also influenced by trade union bargaining power, minimum wage legislation, and monopsony employer power.
What is marginal revenue product (MRP) in IB Economics?
Marginal revenue product of labour is the additional revenue a firm earns by employing one more unit of labour - calculated as the marginal product of labour multiplied by the price of the output. Firms hire up to the point where MRP equals the wage, making MRP the theoretical foundation of the labour demand curve and the primary explanation for wage differentials between high-productivity and low-productivity occupations.
Why does a minimum wage cause unemployment in theory?
A minimum wage set above the equilibrium wage acts as a price floor. At the minimum wage, quantity of labour supplied exceeds quantity demanded, creating a surplus equivalent to unemployment. The actual employment effect depends on how far above equilibrium the floor is set, the wage elasticity of demand, and whether employers have monopsony power - in which case a minimum wage can increase both wages and employment simultaneously.
What causes wage differentials in IB Economics?
Wage differentials arise from differences in marginal revenue product between occupations, differences in human capital (education and skills), compensating differentials for unpleasant or dangerous work, trade union power in certain sectors, geographical immobility that traps workers in lower-wage local markets, and labour market discrimination. A strong IB Economics response identifies which factor is most relevant to the specific context in the question.
What is the difference between labour supply and labour demand shifters?
Labour demand shifts in response to changes in the price of the firm's output, changes in worker productivity, and changes in the prices of other factors of production. Labour supply shifts in response to population and demographic changes, net migration, participation rate changes, and changes in non-wage conditions. The wage itself does not shift either curve - it causes movement along the curve. Confusing shifts with movements along the curve is one of the most common errors in IB labour market questions.
More information about:
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IB Economics Microeconomics Hub Page access Market Equilibrium, and competitive labour markets content as well as the rest of module 2
IB Economics Diagrams Page Check Unit 6 for All Market Equilibrium and Unit 18 for Unemployment diagrams with explanations
IB Economics Macroeconomic Equilibrium Page learn how equilibrium works at macroeconomics
IB Economics Activity book Page Turn to Unit 2.3 for Market Equilibrium and competitive labour markets and Unit 3.11 for Unemployment exam practice, activities, model answers and IB Economics Marking schemes
IB Economics Supply Page directly related to market equilibrium, explore how supply works
IB Economics Calculations Book make sure you check unit 4 for Market Equilibrium and Unit 18 for Unemployment calculations exercises, IB model answers, and IB marking schemes
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