The president of Tucker Motors says, "Lowering the price won't sell a single additional Tucker car." The president believes that the price elasticity of demand is: a. unitary elastic. b. perfectly elastic. c. elastic. d. perfectly inelastic.

To determine the price elasticity of demand based on the president's statement, we need to understand the definitions of the different types of elasticity: 1. **Perfectly Inelastic (d)**: Demand does not change at all with a change in price. Consumers will buy the same quantity regardless of price changes. 2. **Inelastic (c)**: Demand changes, but not proportionately to price changes. A price decrease will lead to a smaller percentage increase in quantity demanded. 3. **Unitary Elastic (a)**: Demand changes proportionately with price changes. A price decrease leads to an equal percentage increase in quantity demanded. 4. **Elastic (b)**: Demand changes significantly with price changes. A price decrease leads to a larger percentage increase in quantity demanded. Given the president's statement, "Lowering the price won't sell a single additional Tucker car," it indicates that even if the price is lowered, the quantity demanded remains unchanged. This suggests that the demand for Tucker cars is not responsive to price changes at all. Therefore, the correct answer is: **d. perfectly inelastic.**