A-Level Business Studies · Theme 3 & 4 · Edexcel

Supply & Demand

An interactive diagram using the confectionery market. Use the scenarios to shift the curves — then watch what happens to price and quantity.

The Chocolate Market
Equilibrium: where buyers and sellers agree on price and quantity
Equilibrium Price
£1.50
per bar
Equilibrium Quantity
50m
bars per month
Demand (D)
Supply (S)
Shifted Demand (D₂)
Shifted Supply (S₂)
Demand Scenarios
Supply Scenarios

Reading the Diagram

Demand curve slopes DOWN ↘The higher the price, the fewer bars consumers want to buy. Lower prices attract more buyers.
Supply curve slopes UP ↗Higher prices give producers more incentive to make and sell more. Lower prices reduce their willingness to supply.
Equilibrium ✕Where supply and demand cross. This is the market-clearing price — no surplus, no shortage.
Shifts vs MovementsA price change = movement along the curve. A non-price change (income, costs, trends) = a shift of the whole curve.

Test Yourself

Six questions on supply, demand, and the confectionery market. Try to predict what happens to price and quantity before you check the answer.

Question 1
Cocoa harvests in Ghana are destroyed by drought. What happens to the price of chocolate?
🌦️ Supply shock scenario
Question 2
Cadbury opens a new factory, increasing output by 30%. What happens to equilibrium quantity and price?
🏭 Economies of scale / supply increase
Question 3
A viral TikTok trend makes luxury dark chocolate hugely popular. The supply stays the same. What happens?
📱 Demand shift scenario
Question 4
The government introduces a sugar tax that raises production costs. What is this called and what happens to supply?
🚢 Government intervention
Question 5
What is the key difference between a movement along the demand curve and a shift of the demand curve?
📐 Exam technique — command word: Explain
Question 6
Christmas arrives. Demand for confectionery surges. At the same time, a cocoa shortage reduces supply. What is the likely effect on price?
🎄 Both curves shift — exam-style analysis