Supply and demand are economic forces that determine the amount of a product that is produced and its price. The supply of a product is the amount of it that businesses are willing and able to offer for sale at alternative prices. Generally, the higher the price is, the greater the amount supplied will be. Similarly, the demand for a product is the amount of it that users can and would like to buy at alternative prices. Demand also depends on the price, but in the opposite way. Usually, the quantity demanded is lower at high prices than at low ones. Because the amount that producers actually sell must be the same as the amount that users actually buy, the only price at which everyone can be satisfied is the one for which supply equals demand. This is called the equilibrium price.