How prices are determined — AQA GCSE Economics
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How prices are determined explained
This section requires learners to understand how the interaction of supply and demand determines equilibrium prices in a market.
Read the full explanation
You must be able to analyse how shifts in either curve affect price and quantity. Furthermore, you need to evaluate intermarket relationships, such as how a poor harvest in the wheat market increases costs and reduces supply in the bread market. Finally, the guidance mandates mastering price elasticities of demand and supply. You must know how to calculate these using percentage changes and interpret the resulting coefficients to determine if a product is price elastic or inelastic, applying this to real-world scenarios like taxation or revenue forecasting.
Your focus
- Analyse how the interaction of supply and demand determines market equilibrium prices.
- Explain how changes in conditions in one market affect prices and quantities in related markets.
- Calculate and interpret price elasticities of demand and supply using percentage changes.
How prices are determined exam tips
Examiner Tips
- 💡Practise drawing supply and demand diagrams to visually confirm how shifts affect the equilibrium price and quantity before writing your analysis.
- 💡When analysing intermarket relationships, explicitly state whether the goods are substitutes, complements, or derived demand to structure your reasoning.
- 💡Memorise the elasticity formula and ensure you can interpret values greater than one as elastic and values between zero and one as inelastic.
Common Mistakes
- Misunderstanding: Believing that a change in price causes a shift in the supply or demand curve. Correction: Understand that a change in price causes a movement along the curve, whereas changes in non-price factors cause the curve to shift.
- Misunderstanding: Treating substitute and complementary goods as having the same intermarket effects. Correction: Recognise that an increase in the price of a substitute increases demand for the alternative, while an increase in the price of a complement decreases demand for the related good.
- Misunderstanding: Calculating elasticity by dividing the change in price by the change in quantity. Correction: Always calculate elasticity by dividing the percentage change in quantity by the percentage change in price.