Allocation of Resources · 4 question types
Past paper frequency (2018 to 2024)
This topic accounts for approximately 18% of your exam marks.
Supply appears alongside demand on virtually every paper; cost changes, technology, and taxes/subsidies are the most tested supply shifters.

A supply curve plots the quantity of a good producers will offer (horizontal axis) against the price (vertical axis). It slopes upward from lower-left to upper-right, the opposite direction to the demand curve. IGCSE diagrams use straight lines for ease.
Standard layout on every supply-curve diagram:
S for the supply curve. Shifts to S₁ (left, less supplied) or S₂ (right, more supplied) when conditions of supply change.