causes of shifts in and movement along the supply curve of labour to a firm or to an occupation

Labour Market Forces & Government Intervention

Objective

Understand the causes of shifts in and movement along the supply curve of labour to a firm or occupation.

What is the Supply Curve of Labour?

Think of the supply curve as a road that shows how many workers a firm is willing to hire at different wage rates. The vertical axis is the wage rate (\$W\$) and the horizontal axis is the quantity of labour supplied (\$Qs\$). 📈

Movement Along the Curve

A movement along the supply curve happens when the wage changes but the underlying conditions (like skills, preferences, and technology) stay the same. For example, if a company raises wages from \$10 to \$12 per hour, more workers will be attracted, moving up the curve. This is a movement along the curve, not a shift. 🔄

Shifts of the Supply Curve

A shift occurs when something else changes, altering the quantity of labour supplied at every wage rate. The curve moves rightward (more labour supplied) or leftward (less labour supplied). 📊

Factors Causing Shifts

  • 📚 Education & Training: More skilled workers increase supply → rightward shift.

  • 🏠 Population Growth: More people in the labour market → rightward shift.

  • 💰 Wage Expectations: If workers expect higher future wages, they supply less now → leftward shift.

  • 🌍 Immigration: Inflow of foreign workers → rightward shift.

  • 🛠️ Technology: Automation can reduce the need for certain jobs → leftward shift.

  • ⚖️ Minimum Wage Laws: Setting a floor can push the supply curve upward at lower wages.

  • 📉 Health & Safety Concerns: Poor working conditions can reduce supply → leftward shift.

Government Interventions

The government can influence labour supply through policies such as:

  1. 💵 Subsidies for training → increases supply.

  2. 📈 Tax Incentives for hiring → shifts supply right.

  3. 🛑 Regulations on working hours → may reduce supply.

  4. 🏥 Healthcare Benefits → attracts more workers.

Illustrative Table

Wage (\$W\$)Labour Supplied (\$Qs\$)
$850
$1070
$1290

Mathematical Representation

The supply of labour can be expressed as:

\$Qs = a + bW\$

Where a is the intercept (baseline supply) and b is the slope (how sensitive supply is to wage changes). A shift changes a or b.

Exam Tip

• When asked to explain a shift, always mention the cause (e.g., education, immigration) and show the direction (rightward or leftward).

• For movement along the curve, highlight that the cause is a wage change only.

• Use the diagram: label the original and new curves, and indicate the shift direction with an arrow.

• Remember that government policies can be viewed as either a shift (e.g., subsidies) or a movement (e.g., wage floor).

• Practice with quick flashcards: “What would happen if the minimum wage increases?” → leftward shift in supply at lower wages.