Final answer:
A linear demand curve with a constant unitary elasticity is a curved line.
Step-by-step explanation:
A linear demand curve with a constant unitary elasticity is a curved line.
Constant unitary elasticity means that the percentage change in quantity demanded is the same as the percentage change in price. This indicates that the demand curve is responsive to price changes in a proportional manner.
Therefore, the nature of the demand curve derived from a linear demand curve must be unitary elastic.