The Examiner's Vault: How Equilibrium Price Works (CIE 9708 Paper 2)
Updated: Sep 2
Welcome back to The Examiner's Vault! Today we tackle a deceptively simple question from Chapter 2: Supply, Demand, and Equilibrium.
Most students think this is a "free" 4 marks. But the examiner report shows that over 30% of candidates fail to define both equilibrium price AND equilibrium quantity separately, costing them easy knowledge marks.
The Question:
"Define equilibrium price and quantity and explain how they are determined in a market." *(4 Marks)*
📝 The Bullet Point Plan:
Define equilibrium price (where Qd = Qs).
Define equilibrium quantity (amount traded at that price).
Explain the market mechanism: excess supply pushes price down, excess demand pushes price up.
Reference a supply and demand diagram.
✍️ The Basic Answer:
[DEFINE] Equilibrium price is the price at which the quantity of goods demanded by consumers equals the quantity supplied by producers. Equilibrium quantity refers to the amount of goods traded at this price.
[EXPLAIN] In a competitive market, equilibrium is determined by the interaction of supply and demand. If the price is above equilibrium, excess supply occurs, leading producers to lower prices to sell unsold stock. Conversely, if the price is below equilibrium, excess demand creates upward pressure on price as consumers compete for the limited supply.
The full answer, free
The model answer for this exact question is on the portal, with the demand and supply diagram, the full model answer and the mark scheme wording. There is no payment and no account. Open the free notes and practice.
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