Picture the strawberry growers near your town. Two different things can happen.
Scenario 1: the price changes
The price changes
Only the price of strawberries changes. Nothing else.
Producers move along S
They offer more at a higher price on the same curve S.
Our example (made-up numbers)
| Price | Boxes offered |
|---|---|
| €4 | 20 |
| €6 | 40 |
| €8 | 60 |
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Scenario 2: something else changes
Wages for strawberry pickers fall
The price stays at €6, but producing costs less.
The whole curve shifts
More is offered at every price: S1 moves right to S2.
Our example (made-up numbers)
| Price | Boxes offered before | Boxes offered after |
|---|---|---|
| €6 | 40 | 60 |
| €4 | 20 | 40 |
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Remember it as: Own price: slide along. Anything else: shift.
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Seven things other than the price shift the whole supply curve.
What shifts the supply of strawberries
Costs of production fall
Wages for pickers fall, so each box costs less to produce.
Price of a good in competitive supply rises
Raspberries sell for more, so growers plant raspberries instead.
An indirect tax is added
A tax on every box raises each grower's costs.
A subsidy is paid
The government pays growers for every box, so costs fall.
Prices expected to rise
Growers expect €4 a box next week instead of €3, so they keep some boxes in cold storage to sell then: fewer are offered today.
Technology improves
New greenhouses grow more strawberries from each field.
Number of firms rises
New growers start up nearby, so more boxes are offered.
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The points to remember
- Each one shifts supply at every price.
- Most work through costs.
Seen in texts: all cut supply
A shock
A storm, flood or strike.
Imported inputs cost more
A tariff or a weaker currency.
New regulations
Safety or pollution rules.
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A shift in supply moves the price. More offered at every price pushes the price down.
What happens to the price, step by step
Supply rises
Because of the new greenhouses, producers now offer 60 boxes at €6, not 40.
A surplus
Buyers still want only 40 at €6, so 20 boxes are left unsold.
The price falls
Sellers cut the price to €5, where 50 boxes are bought and sold.
Animated graph
Watch the graph build step by step in study mode.
The points to remember
- Supply rises: a surplus at the old price, so the price falls and quantity rises.
- Supply falls: a shortage at the old price, so the price rises.
Quick reminder
- Curves: D, S1 and S2 (S2 to the right)
- Marks: P1, P2, Q1 and Q2
- Dots with dashed lines to the axes, an arrow for the shift
- No numbers, no title
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Paper 1 asked this in November 2025, as part (a) for 10 marks.
Explain two non-price determinants that could increase the market supply of a good.
Model answer plan
See the answer broken into clear points, with guidance on how each point earns marks.
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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: S1.
- The new curve S2, to the right of S1, with an arrow.
- Q1 → Q2 at the same price P1.
- In your writing, say S1 shifts right to S2 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 |