Reasons for differences in wages: demand for and supply of labour

Microeconomic Decision‑Makers – Workers

Why Do Wages Differ? The Role of Labour Demand & Supply

Think of the labour market like a bustling farmers’ market.

• Demand for labour is the number of “stalls” (jobs) that businesses want to fill.

• Supply of labour is the number of “farmers” (workers) willing to work at various wages.

The wage you earn is the price where the two curves meet – the intersection of demand and supply.

1️⃣ Demand for Labour

Demand depends on how much a firm can sell its product and how much it costs to hire workers.

The demand curve for labour is usually down‑sloping because:

  • Higher wages → higher cost → fewer workers hired.

  • Lower wages → lower cost → more workers hired.

Analogy: Imagine a bakery that can bake 100 cakes a day. If the cost of flour (wage) rises, the bakery may bake fewer cakes, so it needs fewer bakers.

2️⃣ Supply of Labour

Supply is the number of workers willing to work at each wage.

The supply curve is usually up‑sloping because:

  • Higher wages → more people are willing to work.

  • Lower wages → fewer people are willing to work.

Analogy: Think of a concert where ticket price (wage) is high. More people will buy tickets (work) because they value the experience more. If tickets are cheap, fewer people attend.

3️⃣ Factors Shifting Demand & Supply

  1. Demand side:

    • Product price ↑ → demand for product ↑ → demand for labour ↑.

    • Technology ↑ → labour needed ↓ → demand for labour ↓.

    • Substitution of capital for labour ↑ → demand for labour ↓.

  2. Supply side:

    • Education & training ↑ → more skilled workers → supply ↑.

    • Population growth ↑ → more workers → supply ↑.

    • Immigration restrictions ↑ → supply ↓.

4️⃣ Real‑World Example: Tech vs. Manual Labour

• Tech sector – high demand for specialised skills, low supply → higher wages.

• Manual labour – many workers, lower skill requirement → lower wages.

The wage gap is a direct result of the relative shifts in demand and supply curves.

5️⃣ Exam Tip Box

Key Points to Remember:

  • Explain how a shift in the demand curve for labour affects wages.

  • Describe how a shift in the supply curve for labour affects wages.

  • Use the intersection of demand and supply to illustrate equilibrium wage.

  • Give at least one real‑world example for each shift.

Tip: Use the “market for labour” analogy to make your answer clear and memorable.

6️⃣ Quick Reference Table

FactorEffect on DemandEffect on Supply
Technology↓ (replaces labour)No direct effect
Education↑ (more skilled workers needed)↑ (more workers available)
Minimum Wage↓ (firms hire fewer workers)↑ (more workers willing to work at higher wage)

7️⃣ Final Thought

Remember: wages are the price that balances how many workers businesses want and how many workers are ready to work.

By understanding the forces that shift demand and supply, you can predict how wages will change in different industries and economies. 🚀