OCR GCSE Economics: The Role of Markets and Money — Revision Notes

Condensed for the final weeks. For the full explanation, use the The Role of Markets and Money study guide.

Shift vs movement — the most tested distinction

	Cause	Effect on curve
Movement along	Change in price	Slides along the same curve
Shift of curve	Change in anything else (income, tastes, costs, number of suppliers)	Whole curve moves

Markets and sectors (2.1)

Primary sector extracts raw materials; secondary manufactures; tertiary provides services. A product market trades goods/services; a factor market trades land, labour, capital or enterprise.

Specialisation and exchange: benefits — higher output and productivity, wider choice through trade; costs — repetitive work, narrow skills if demand falls, a region dependent on one industry is exposed when it declines.

Demand, supply and equilibrium (2.2–2.4)

Demand curve: slopes down — price ↓, quantity demanded ↑. Supply curve: slopes up — price ↑, quantity supplied ↑. A change in the good’s own price = movement along; anything else (income, tastes, costs, technology, number of firms) = shift. Demand and supply diagrams are the single most heavily examined diagram in this component. Equilibrium: where the demand and supply curves intersect — the price and quantity where the market clears.

PED = %change in Qd / %change in P        PES = %change in Qs / %change in P

|PED| > 1 → elastic, price rise cuts revenue. |PED| < 1 → inelastic, price rise raises revenue. Price elasticity measures the responsiveness of quantity to a price change, not simply whether demand/supply is “high” or “low.”

Competition and production (2.5–2.6)

Monopoly and oligopoly are departures from competitive markets — differ not just in the number of firms but in how market power affects price, output and consumer choice.

total cost = fixed + variable          profit = total revenue - total cost
average cost = total cost / output     average revenue = total revenue / output

Economies of scale reduce average cost as output rises (bulk buying, large-scale machinery, cheaper finance, shared advertising cost); total cost still rises, only cost per unit falls.

Worked example: 200 units, total cost £8,000, total revenue £11,000 → average cost £40, average revenue £55, profit £3,000.

The labour market (2.7)

Demand for labour (from employers) is a derived demand and slopes down; supply of labour (from workers) slopes up; the equilibrium wage is where they meet. Demand shifts with demand for the product, productivity and the cost of machinery; supply shifts with the skills and training needed, the number of people who have them, working conditions and non-wage benefits, and the size of the working population.

Worked example: net pay (2.7)

Gross pay £2,400/month; income tax £280; national insurance £190; pension £120.

Net pay = £2,400 - (£280 + £190 + £120) = £2,400 - £590 = £1,810

The role of money (2.8)

Money as a medium of exchange. The financial sector (banks, building societies, insurance) enables saving, borrowing and investment, and transmits interest rate changes through the economy — not just “storing money.”

Higher interest rates → saving ↑, borrowing ↓, investment ↓ (and the reverse). Example: £5,000 saved for a year earns £100 at 2% and £150 at 3%.

Worked example: interpreting a demand curve shift

New scientific research links a food product to health benefits, and demand for it rises at every price level.

Cause:  a change in consumer tastes/preferences (not a change in
        price)
Effect: the whole demand curve shifts RIGHT (outward) -- more is
        demanded at every price, not just at the original price
Distinguish from: a fall in the product's own price, which would
        instead cause a movement ALONG the original demand curve to
        a lower price, higher quantity point

Being able to say precisely why a scenario causes a shift rather than a movement – naming the non-price factor responsible – is what distinguishes a strong answer from one that only draws the diagram correctly.

The eight sub-topics as one connected sequence

Markets (2.1) sets the scene; demand (2.2) and supply (2.3) develop in parallel using the same diagram skills before combining into price determination (2.4). Competition (2.5) and production (2.6) then apply that price model to firm behaviour, before the labour market (2.7, where the “good” priced is work itself) and money/financial markets (2.8, which underpin every transaction described earlier) extend the same underlying model to two further markets. A student who has not mastered the basic demand-and-supply diagram in 2.2-2.4 will struggle with every subsequent sub-topic, since all of them are applications of the same model – so prioritise fluency there before moving on.

Command words matter as much as content

OCR’s mark schemes distinguish “explain” (state a mechanism, with reasoning) from “evaluate” (weigh up and reach a justified conclusion) and “draw”/“analyse” (produce and interpret a diagram). Many marks are lost not from wrong content but from answering an evaluate-level question with only an explain-level response – practise the specification’s own command words in order (explain before evaluate; draw before analyse) as a deliberate revision structure, not an afterthought.

Key terms

Equilibrium price — the price at which quantity demanded equals quantity supplied. Price elasticity — the responsiveness of quantity demanded/supplied to a change in price. Monopoly — a market dominated by a single seller with significant market power. Gross pay — total pay before deductions. Net pay — pay after income tax, national insurance and pension deductions.

Why this topic follows Topic 1

Topic 2 follows directly from Topic 1 (economic agents and the basic economic problem) and builds the core market model that the rest of the qualification, including Component 02 (National and International Economics), depends on. Since this topic and Component 02 share synoptic assessment, revise the labour market and financial markets sub-topics with an eye to how they connect to unemployment, inflation and monetary policy, which appear later in the qualification.

Common mistakes

• Confusing a shift of a curve with a movement along it.
• Describing monopoly/competitive markets as differing only in number of firms.
• Mixing up price elasticity of demand and supply.
• Treating gross and net pay as interchangeable.
• Describing the financial sector’s role only as “storing money.”

Quick self-test

1. What causes a movement along a demand curve, versus a shift of it?
2. Define equilibrium price and quantity.
3. What does price elasticity measure?
4. Gross pay is £1,800; deductions total £410. Find net pay.
5. Name two functions of the financial sector beyond storing money.
6. New health research increases demand for a food product at every price. Does this shift the demand curve or cause a movement along it, and in which direction?

Answers: 1. Movement: a change in price. Shift: a change in anything else (income, tastes, costs, number of suppliers). 2. The price and quantity at which the demand and supply curves intersect, where quantity demanded equals quantity supplied. 3. The responsiveness of quantity demanded or supplied to a change in price. 4. £1,800 − £410 = £1,390. 5. Any two: enabling saving, enabling borrowing, enabling investment, transmitting interest rate changes through the economy. 6. It shifts the whole demand curve to the right (outward), since the cause is a change in tastes/preferences rather than a change in the product’s own price.

Related resources

• The Role of Markets and Money study guide
• The Role of Markets and Money practice questions

Official syllabus

OCR, GCSE (9-1) in Economics (J205) Specification, Version 2.0 (June 2026), Section 2c — ocr.org.uk.