The National Minimum Wage and Living Wage

A minimum wage is a price floor in the labour market — a legal limit below which the hourly wage may not fall. It is, on its face, the most direct policy a government can use to raise the pay of the lowest-earning workers. Yet it is also one of the most theoretically contested interventions in all of microeconomics, because the standard competitive model and the monopsony model of Lesson 4 make opposite predictions about its employment effects. In a competitive market a binding floor causes excess supply of labour — unemployment. Under monopsony the very same floor can raise both the wage and employment. Which prediction holds in the real UK low-wage labour market is, ultimately, an empirical question, and the evidence accumulated since the National Minimum Wage (NMW) was introduced in 1999 has surprised many economists. This lesson builds both diagrams from first principles, surveys that evidence, and equips you to evaluate the policy with the conditional, "it depends" judgement that examiners reward — rather than the reflexive "minimum wages destroy jobs" that loses marks.

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Spec Mapping (AQA 7136)

This lesson sits within Section 4.1.6 — The labour market of the AQA A-Level Economics (7136) specification, the microeconomics half of the course, and applies directly the competitive model (Lesson 3) and the monopsony model (Lesson 4). It is also the bridge into the distribution-of-income material (4.1.7), since the minimum wage is one of the principal tools of inequality and poverty policy (Lesson 10).

• Assessment: The minimum wage is examined principally on Paper 1 (Markets and market failure) — a 2-hour paper combining a 40-mark data-response section and a choice of 25-mark essay — and recurs synoptically on Paper 3 (Economic principles and issues), where its employment effects connect micro labour-market analysis to the macro objectives of low unemployment and reduced inequality.
• AO1 (Knowledge): Define a minimum wage as a price floor, the NMW and the National Living Wage (NLW), the "bite", the Low Pay Commission (LPC), and the competitive and monopsony predictions.
• AO2 (Application): Apply both models to real UK low-wage sectors — hospitality, retail, social care, cleaning — and to the actual UK NMW/NLW experience since 1999.
• AO3 (Analysis): Construct the competitive wage-floor diagram (excess supply) and the monopsony diagram (where the floor can raise wage and employment), and build chains of reasoning explaining the determinants of the size of any employment effect.
• AO4 (Evaluation): Weigh the competing predictions against the empirical evidence, consider the time horizon, regional variation, the elasticity of labour demand and the distinction between hours and headcount, and reach a justified judgement.

Exam Tip: The single most valuable move on any minimum-wage question is to present both models — competitive and monopsony — and then ask which better describes the market in the question. A candidate who draws only the competitive "unemployment" diagram has answered half the question; the discriminator between the bands is recognising that the employment effect is theoretically ambiguous and turns on market structure.

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What Is a Minimum Wage?

Key Definition: A minimum wage is a legally enforceable price floor in the labour market — the lowest hourly wage an employer may lawfully pay. To have any effect it must be set above the free-market equilibrium wage; a floor set below equilibrium is non-binding and does nothing.

The UK operates two related statutory floors, both recommended by the Low Pay Commission (LPC) and set by government:

Key Definition: The National Minimum Wage (NMW) is the legally enforceable minimum hourly rate for younger and apprentice workers. The National Living Wage (NLW) is the higher rate for workers aged 21 and over (since April 2024, previously 23+). Both are legal floors — distinct from the voluntary Real Living Wage discussed below.

A short history clarifies why the policy was introduced and how it has evolved:

Year	Event
1909	Trade Boards Act — set minimum rates in specific "sweated" industries (tailoring, box-making)
1945–1993	Wages Councils set minimum rates in various low-pay sectors
1993	Wages Councils abolished
1998	National Minimum Wage Act passed; Low Pay Commission established
April 1999	NMW introduced: £3.60/hour for adults, £3.00 for 18–20-year-olds
April 2016	National Living Wage (NLW) introduced at £7.20 for workers aged 25+
April 2021	NLW age threshold lowered to 23+
April 2024	NLW extended to workers aged 21+; headline rate £11.44/hour

The age-banding reflects a deliberate policy choice: younger workers have a lower floor partly because their productivity (and $MRP_{L}$MRPL​, from Lesson 1) is on average lower, and partly to protect youth employment, where demand is thought to be more wage-elastic.

The Low Pay Commission and the "Bite"

The LPC is an independent body comprising employer representatives, worker representatives and academic economists, deliberately designed to be evidence-based and non-partisan. It commissions econometric research, consults businesses and workers, and recommends rates to government. Since 2016 its remit has been anchored to a numerical target — for the NLW to reach two-thirds of median hourly earnings — which the 2024 rate broadly achieves.

Key Definition: The "bite" of the minimum wage is the NLW expressed as a percentage of median hourly earnings. It measures how high the floor sits relative to the middle of the wage distribution, and hence how many workers it binds on and how large any employment effect is likely to be.

The bite rose from roughly 46% in 1999 to about two-thirds by 2024. This matters enormously for the analysis: a low-bite floor binds on few workers and sits only just above equilibrium, so any disemployment is small; a high-bite floor binds on many and sits far above equilibrium, magnifying the predicted competitive job losses. The rising bite is precisely why economists watch each uprating carefully for emerging employment effects.

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The Competitive Model: A Wage Floor Above Equilibrium

In a perfectly competitive labour market — many small employers, none able to influence the wage — the free-market equilibrium wage $W_{e}$We​ clears the market, equating the quantity of labour demanded and supplied at $L_{e}$Le​. Now impose a binding minimum wage $W_{min}$Wmin​ above $W_{e}$We​. Two things happen, working through the demand and supply curves derived in Lessons 1 and 2:

1. Quantity demanded falls. Firms move up their downward-sloping labour-demand ($MRP_{L}$MRPL​) curve: at the higher wage, the marginal worker no longer pays for themselves, so employment contracts from $L_{e}$Le​ to $L_{d}$Ld​.
2. Quantity supplied rises. The higher wage draws more workers into this labour market (substitution effect, plus new entrants), so quantity supplied rises from $L_{e}$Le​ to $L_{s}$Ls​.

The result is excess supply of labour equal to $L_{s} - L_{d}$Ls​−Ld​ — workers who want jobs at $W_{min}$Wmin​ but cannot find them. This is classical (real-wage) unemployment: it exists because the wage is held above the market-clearing level.

This was the standard neoclassical prediction, and it underpinned the opposition to the NMW before its 1999 introduction. Patrick Minford (1998) famously forecast that the policy would destroy up to two million jobs. Crucially, the size of the predicted job loss depends on the wage elasticity of demand for labour (Lesson 1, via Marshall's Rules): if demand is inelastic (labour hard to substitute with capital, product demand inelastic, labour a small share of cost), the floor causes only a small fall in employment; if demand is elastic, the job losses are large. A flat $MRP_{L}$MRPL​ curve means a big $L_{e} \to L_{d}$Le​→Ld​ contraction; a steep one means a small contraction. This is the first essential evaluation lever.

Exam Tip: Never simply assert "the minimum wage causes unemployment." State the prediction and immediately qualify it: "in a competitive market a binding floor causes classical unemployment equal to $L_{s}-L_{d}$Ls​−Ld​, but the size of that effect depends on the wage elasticity of labour demand — small where labour is hard to replace." The qualification is the AO3/AO4 mark.

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The Monopsony Model: A Floor That Can Raise Wage AND Employment

The competitive prediction depends entirely on the assumption that firms are wage-takers. In a monopsony (Lesson 4) the dominant employer faces the upward-sloping market supply curve, so to hire one more worker it must raise the wage of all workers — meaning the marginal cost of labour ($MC_{L}$MCL​) lies above the supply curve ($S = AC_{L}$S=ACL​). Left alone, the monopsonist hires where $MC_{L} = MRP_{L}$MCL​=MRPL​ at employment $L_{m}$Lm​, then pays the lowest wage that attracts $L_{m}$Lm​ workers, read down to the supply curve at $W_{m}$Wm​ — a wage below both $MRP_{L}$MRPL​ and the competitive wage.

Now impose a minimum wage $W_{min}$Wmin​ set between the monopsony wage $W_{m}$Wm​ and the competitive wage $W_{c}$Wc​. The floor transforms the firm's cost of labour. Up to the point where $W_{min}$Wmin​ meets the supply curve, the firm can now hire any number of workers at the fixed legal wage $W_{min}$Wmin​ — it no longer has to bid the wage up for everyone to expand. Over that range the labour supply curve becomes horizontal at $W_{min}$Wmin​, so $MC_{L} = AC_{L} = W_{min}$MCL​=ACL​=Wmin​. The monopsonist's incentive to restrict employment — the wedge between $MC_{L}$MCL​ and the wage — vanishes over that segment. The firm now hires where this new, flat $MC_{L}$MCL​ meets $MRP_{L}$MRPL​, which is at a higher level of employment than $L_{m}$Lm​.

The outcome is the celebrated, counterintuitive result: employment rises from $L_{m}$Lm​ to $L_{min}$Lmin​ and the wage rises from $W_{m}$Wm​ to $W_{min}$Wmin​. The deadweight loss of monopsony shrinks. A correctly chosen floor can move the market toward the efficient competitive outcome. Push the floor too high, however — above the competitive wage $W_{c}$Wc​ — and the analysis reverts to the competitive case: employment then falls below the competitive level. There is therefore an "optimal" band: between $W_{m}$Wm​ and $W_{c}$Wc​ the floor raises both wage and jobs; above $W_{c}$Wc​ it destroys jobs.

Outcome	Monopsony (no floor)	Floor between $W_{m}$Wm​ and $W_{c}$Wc​	Floor above $W_{c}$Wc​
Wage	$W_{m}$Wm​ (lowest)	$W_{min}$Wmin​ (higher)	very high
Employment	$L_{m}$Lm​ (restricted)	$L_{min}$Lmin​ (higher)	falls below competitive level
Efficiency	deadweight loss	loss reduced/eliminated	new deadweight loss

Exam Tip: The monopsony case is the highest-value content in this lesson because it is genuinely counterintuitive and many candidates miss it. To access the top band, state explicitly that the result holds only for a floor set between $W_{m}$Wm​ and $W_{c}$Wc​, and that a floor set too high destroys jobs even under monopsony. The conditionality is the analysis.

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Worked Example — The Bite and a Marginal Firm

The numbers below are hypothetical, chosen to illustrate the mechanics. Suppose a small café employs cleaners and faces an NLW uprating from £10.00 to £11.44 per hour — a rise of:

$\%\ \Delta\ W = \frac{11.44 - 10.00}{10.00} \times 100 = 14.4\%$% Δ W=10.0011.44−10.00​×100=14.4%

If the café's wage elasticity of demand for cleaning labour is a relatively inelastic $-0.3$−0.3, the predicted fall in cleaning hours is:

$\%\ \Delta\ Q_{L} = E_{DL} \times \%\ \Delta\ W = -0.3 \times 14.4\% = -4.3\%$% Δ QL​=EDL​×% Δ W=−0.3×14.4%=−4.3%

So a 14.4% pay rise costs roughly 4.3% of cleaning hours — modest, because cleaning is hard to automate at small scale (low substitutability, Marshall's first rule). Contrast a warehouse with elastic demand of $-1.2$−1.2 (automation feasible): the same uprating implies a $-1.2 \times 14.4\% = -17.3\%$−1.2×14.4%=−17.3% fall in hours — far larger. The lesson is general: the same minimum-wage rise produces very different employment effects depending on the elasticity of labour demand, which is why blanket claims about "the" employment effect are unsafe.

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Empirical Evidence: What Actually Happens?

Because theory is ambiguous, the question is empirical. The landmark study is Card and Krueger (1994), who compared fast-food employment in New Jersey (which raised its state minimum wage) with neighbouring Pennsylvania (which did not). They found no significant fall in New Jersey employment — and, if anything, a slight rise — directly contradicting the competitive prediction and consistent with monopsony power in low-wage labour markets. Neumark and Wascher (2000) challenged their survey methodology using payroll records and found small negative effects, igniting a long debate; but the centre of gravity of the literature has shifted toward the view that moderate minimum-wage rises have little or no disemployment effect.

The UK experience since 1999 broadly supports this:

• Metcalf (2008), reviewing nearly a decade of UK evidence, concluded the minimum wage had "raised the wages of the lowest paid without any significant adverse effect on employment."
• Dube (2019), in a review commissioned by the UK Treasury, concluded that "the overall body of evidence ... points to a muted effect of minimum wages on employment."
• Successive Low Pay Commission annual reports have found pay raised at the bottom of the distribution with little robust evidence of significant negative employment effects through the period of a rising bite.

Two important qualifications temper this optimistic picture. First, several studies detect effects on hours rather than headcount — firms trim shifts, cut paid breaks or raise work intensity rather than make redundancies, so the jobs count understates the labour-input adjustment. Second, the evidence is reassuring about the range tested so far; as the bite climbs toward and beyond two-thirds of median earnings into territory with little historical precedent, past results cannot simply be extrapolated. "No effect at a 50% bite" does not guarantee "no effect at a 70% bite."

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How Firms Respond — Beyond Hiring and Firing

A binding floor does not force a binary choice between absorbing the cost and cutting jobs. Firms have a margin of adjustment that helps explain the muted employment evidence:

flowchart TD
  A[Minimum wage rise raises labour cost] --> B[Absorb via lower profit margin]
  A --> C[Pass on via higher prices to consumers]
  A --> D[Raise productivity - training, reorganisation, efficiency wages]
  A --> E[Cut hours, overtime or paid breaks]
  A --> F[Substitute capital for labour over time]
  A --> G[Reduce employment - last resort]