Picture the bubble tea café next to your school. Two different things can happen.
Scenario 1: the price changes
- Only the price of a cup changes.
- Buyers move along the same curve D.
Our example (made-up numbers)
| Price of a cup | €7 | €5 | €3 |
|---|---|---|---|
| Cups wanted per week | 20 | 40 | 60 |
Animated graph
Watch the graph build step by step in study mode.
Scenario 2: something else changes
- The price stays at €5. Students get more pocket money.
- The whole curve shifts, D1 to D2.
Our example (made-up numbers)
| Price of a cup | €5 | €3 |
|---|---|---|
| Cups wanted before | 40 | 60 |
| Cups wanted after (more pocket money) | 60 | 80 |
Animated graph
Watch the graph build step by step in study mode.
Remember it as: Own price: slide along. Anything else: shift.
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Five things other than the price shift the whole demand curve.
What shifts the demand for bubble tea
Income rises
Students earn more from weekend jobs, so they can afford more bubble tea.
Tastes and preferences turn against it
A news report says bubble tea is full of sugar, so fewer students want it.
Prices expected to rise
The café says prices go up next month, so students buy more now, before the rise.
Price of a substitute rises
Smoothies become more expensive, so some smoothie drinkers buy bubble tea instead.
Number of consumers rises
A new school opens next door, so there are more students to buy it.
Animated graph
Watch the graph build step by step in study mode.
The points to remember
- Each one changes how much is wanted at every price.
- In an answer, say which way the curve shifts and why.
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Paper 1 asked this in November 2025, as part (a) for 10 marks.
Explain two non-price determinants that could decrease the market demand for a good.
Model answer plan
See the answer broken into clear points, with guidance on how each point earns marks.
Animated graph
Watch the graph build step by step in study mode.
What the diagram must show
- Both axes labelled: Price (P) and Quantity (Q).
- The curve before the change: D1.
- The new curve D2, to the left of D1, with an arrow.
- Q1 → Q2 at the same price P1.
- In your writing, say D1 shifts left to D2 and why.
How the 10 marks are given
| Marks | What your answer needs |
|---|---|
| 9–10 | Both parts fully explained, terms used correctly all the way through, the diagram included and fully explained |
| 7–8 | Both parts explained, terms mostly right, the diagram included and explained |
| 5–6 | Partly explained, some terms, the diagram included |
| 6 at most | Only one of the two parts answered, however good it is |