How are wages determined in a labour market, and why do they differ between groups?
The demand for and supply of labour, wage determination in competitive labour markets, the effects of trade unions and monopsony, and labour market failure.
A focused CCEA A-Level Economics answer on the labour market, covering the derived demand for labour and marginal revenue product, the supply of labour, wage determination in a competitive market, the effects of trade unions, monopsony employers and the minimum wage, and labour market failure, with worked wage analysis.
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What this dot point is asking
CCEA wants you to explain the demand for labour as a derived demand based on marginal revenue product, the determinants of the supply of labour, how wages are set in a competitive labour market, the effects of trade unions and of a monopsony employer, the effect of a minimum wage, and the causes of labour market failure.
The demand for labour
Demand for labour rises when the demand for the product rises, when labour productivity rises, or when the price of the output rises, because each raises the MRPL. The wage elasticity of demand for labour is higher where labour is a large share of costs, where the product demand is elastic, and where machines can easily substitute for workers.
The supply of labour
Wage determination in a competitive market
In a competitive labour market with many employers and workers, the equilibrium wage is set where the market demand for labour meets the market supply of labour, just as in any market. Wages differ between occupations because of differences in MRPL (productivity and the value of output) and in labour supply (skills, training and the non-monetary features of the job).
Trade unions, monopsony and labour market failure
A trade union bargains collectively for higher wages and better conditions. In a competitive labour market, raising the wage above equilibrium causes excess supply of labour (unemployment), a trade-off between pay and jobs whose size depends on the elasticity of labour demand. A monopsony is a single dominant buyer of labour (such as a large local employer) that holds the wage and employment below the competitive level; here a union or minimum wage can raise both the wage and employment toward the competitive outcome. Labour market failure also arises from geographical and occupational immobility, discrimination, skills shortages and persistent wage inequality.
Try this
Q1. Define the marginal revenue product of labour. [2 marks]
- Cue. The extra revenue from employing one more worker: the worker's marginal output multiplied by the price of the output.
Q2. Explain why highly skilled occupations tend to pay higher wages. [4 marks]
- Cue. Higher MRPL (productivity and value of output) raises demand, while long training and qualifications make labour supply inelastic, both pushing wages up.
Q3. Explain how a minimum wage can raise employment when set against a monopsony employer. [4 marks]
- Cue. A monopsony holds wage and employment below the competitive level; a minimum wage at the competitive level removes its power to restrict, raising both pay and the number employed.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA A2 16 marksExplain why the demand for labour is described as a derived demand.Show worked answer →
Worth 6 marks. Markers reward the meaning of derived demand and the link to marginal revenue product.
Derived demand: labour is not wanted for its own sake but for the goods and services it helps to produce, so the demand for labour is derived from the demand for the output.
Link to output: if demand for a firm's product rises, the firm needs more workers to produce it, so demand for labour rises; if product demand falls, so does demand for labour.
Marginal revenue product: a firm hires workers up to the point where the marginal revenue product of labour (the extra output of a worker times its price) equals the wage. A more productive or more valuable output raises the MRP and so raises the demand for labour.
Conclusion: this is why high-productivity, high-value industries pay more and employ more, and why a recession that cuts product demand also cuts employment.
CCEA A2 18 marksEvaluate the effect of a trade union on wages and employment in a competitive labour market.Show worked answer →
Worth 8 marks. Evaluate requires the standard result and the conditions that change it, with a judgement.
Standard result: in a competitive labour market a union that raises the wage above the equilibrium creates excess supply of labour. The quantity of labour demanded falls, so the higher wage comes at the cost of lower employment, a trade-off between pay and jobs.
Elasticity: the size of the job loss depends on the elasticity of labour demand. If demand is inelastic, the wage gain outweighs small job losses; if elastic, employment falls sharply.
Monopsony case: where a single dominant employer (monopsony) holds wages and employment below the competitive level, a union can raise both the wage and employment toward the competitive outcome, so the trade-off disappears.
Judgement: the effect depends on the market. In a competitive market a union raises pay but risks jobs; against a monopsony it can raise pay and employment, so unions are not always bad for employment.
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Sources & how we know this
- CCEA GCE Economics specification — CCEA (2016)