The demand curve is an important concept in economics, representing the relationship between the price of a product or service and the quantity that consumers are willing to purchase. However, there are several synonyms for the term "demand curve" that can be useful to know. These may include the demand schedule, which lists the specific quantities of a product or service that consumers are willing to purchase at different prices, and the consumer surplus, which refers to the benefit that consumers receive from paying less than they are willing to for a product or service. Other related terms may include elasticity of demand, which measures the responsiveness of demand to changes in price, and price ceiling, which sets a maximum limit on the price that can be charged for a good or service.