Identifying equilibrium requires locating the wage at which DL and SL intersect on a labour market diagram. This intersection provides the theoretical market wage and the associated employment level.
Analysing demand shifts involves determining whether changes in productivity, product demand, or capital substitution modify firms' hiring behaviour. A rightward shift increases both equilibrium wages and employment, while a leftward shift reduces them.
Analysing supply shifts requires evaluating demographic, policy, and preference changes that alter workers' willingness to participate. A leftward shift raises wages but lowers employment, while a rightward shift lowers wages and increases employment.
Comparing pre- and post-shift equilibria helps explain the magnitude of wage and employment changes. This comparison clarifies how sensitive a market may be to policy or economic shocks.
| Feature | Demand Shift | Supply Shift |
|---|---|---|
| Impact on Wage | Rightward shift raises wages; leftward shift lowers wages | Leftward shift raises wages; rightward shift lowers wages |
| Impact on Employment | Moves in same direction as shift | Moves opposite direction of wage change |
| Driving Factors | Productivity, product demand, technology | Demographics, migration, preferences |
Demand-driven changes typically reflect firms' side conditions and relate to their production needs. They alter labour requirements based on profitability or output expansion.
Supply-driven changes reflect workforce behaviour and demographic patterns. They adjust labour availability and heavily influence industries dependent on scarce skills.
Always identify whether a curve shifts or whether it is a movement along a curve. Many exam errors stem from confusing changes in wage levels with changes in non-wage factors that shift curves.
Indicate direction clearly on diagrams by marking new curves (e.g., DL2 or SL1) and showing the resulting equilibrium changes. Precise diagram labels often earn marks even if explanations are incomplete.
Check consistency between wage and employment effects. For example, a leftward supply shift must increase wages and decrease employment; mismatching signs indicates a conceptual mistake.
Use cause-and-effect logic by linking the initial change to curve movement, equilibrium adjustment, and final labour market result. This ensures a structured explanation aligned with exam criteria.
Confusing derived demand with direct demand can cause incorrect reasoning about what shifts the labour demand curve. Labour demand depends on product demand, not workers' preferences.
Assuming firms can freely set wages violates competitive market assumptions, since individual firms are wage takers. This misconception leads to errors in interpreting how wage changes occur.
Misreading diagram axes causes students to mistake wage movements for employment changes. Correct interpretation requires identifying wage on the vertical axis and labour quantity on the horizontal axis.
Believing equilibrium is always efficient ignores that real-world frictions may prevent immediate adjustment. Understanding the theoretical model prevents overgeneralisation to imperfect labour markets.
Links to minimum wage policy arise because wage floors disrupt equilibrium, creating excess supply and altering hiring patterns. This connection helps explain labour market responses to wage regulation.
Connections to trade union bargaining exist because unions seek to raise wages above equilibrium, influencing the supply and demand for labour. Understanding equilibrium provides a baseline for evaluating union effects.
Relevance to macroeconomic analysis emerges through unemployment, inflation, and productivity studies. Wage determination shapes overall labour costs, influencing business cycles and inflationary pressures.
Links to human capital theory show how skills influence both supply and demand, altering market-clearing wages. Workers with specialised skills face different equilibrium outcomes than general labourers.
