Price Elasticity of Demand:The measure of how responsive the quantity demanded of a good or service is to a change in its price, with all other factors held constant.
Price Elasticity of Supply:The measure of how responsive the quantity supplied of a good or service is to a change in its price, with all other factors held constant.
Elasticity and Pricing: The relationship between the price elasticity of demand or supply and the pricing strategies a firm can employ to maximize revenue or profit.