Definition, drawing and interpretation of appropriate diagrams. A supply curve to be drawn and used to illustrate movements along a supply curve with appropriate terminology, for example extensions and contractions in supply. The link between individual and market supply in terms of aggregation. The causes of shifts in a supply curve with appropriate terminology, for example increase and decrease in supply.

Calculation of PES using the formula and interpreting the significance of the result. Drawing and interpretation of supply curve diagrams to show different PES. The key influences on whether supply is elastic or inelastic. The implications for decision making by consumers, producers and government.