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 and unitary price-elastic demand?
- Aelastic = 1; unitary = 2
- Belastic = 2; unitary = 3
- Celastic = 3; unitary = 1
- Delastic = 3; unitary = 2