The diagram illustrates the link between total expenditure and price for three products, 1, 2 and 3. Which curves show the products that have price elastic demand and unitary price elastic demand?
- Aelastic: 1, unitary: 2
- Belastic: 2, unitary: 3
- Celastic: 3, unitary: 1
- Delastic: 3, unitary: 2