A purchase means a barter; the person making the purchase (consumer) hands over “money” in exchange of goods or services desired, meanwhile the person selling (seller) offers the good or service in exchange of a determined amount of money.
In economics, consumers are demanders, and the sellers are the suppliers. prices are established depending on the amount of demanders and suppliers that exist in the market, along with other criteria such as the quality of the product, popularity or scarcity. The price for which the demander makes the purchase may include discounts, which will determine the price of the good or service. For example, a company may have available early settlement discount (reduction of the price for paying before due-time) or volume discount (reduction of the price for purchasing certain amounts of goods). consumers may also have discounts available for the purpose of creating purchases more attractive and therefore increase consumption, for example discounts in supermarkets or sales in stores.