Price Elasticity of Demand:The measure of how responsive the quantity demanded of a good or service is to a change in its price, calculated as the percent change in quantity divided by the percent change in price.
Elastic Demand:A situation where the quantity demanded changes by a larger percentage than the change in price, indicating that consumers are highly sensitive to price changes.
Perfectly Inelastic Demand: A scenario where the quantity demanded does not change at all in response to a price change, resulting in a price elasticity of demand equal to zero.