Study Notes
Elasticity in economics measures how much the quantity demanded or supplied of a product changes in response to changes in price or income.
- Price Elasticity of Demand (PED) — measures the responsiveness of quantity demanded to a change in price. Example: If the price of a product increases and the quantity demanded decreases significantly, the demand is price elastic.
- Price Elasticity of Supply (PES) — measures the responsiveness of quantity supplied to a change in price. Example: If the price of a product increases and the quantity supplied increases significantly, the supply is price elastic.
- Income Elasticity of Demand (YED) — measures the responsiveness of quantity demanded to a change in income. Example: If income increases and the demand for luxury goods increases, the demand is income elastic.
Exam Tips
Key Definitions to Remember
- Price Elasticity of Demand (PED)
- Price Elasticity of Supply (PES)
- Income Elasticity of Demand (YED)
Common Confusions
- Confusing price elasticity with income elasticity
- Misinterpreting the numerical values of elasticity
Typical Exam Questions
- What is PED and how is it calculated? PED is calculated using the formula: (% change in quantity demanded) / (% change in price).
- How does the availability of substitutes affect PED? More substitutes make demand more price elastic.
- What factors affect PES? Factors include spare capacity, availability of stocks, and time.
What Examiners Usually Test
- Ability to calculate and interpret elasticity values
- Understanding of factors affecting elasticity
- Application of elasticity concepts to real-world scenarios