Historically, price value has superseded the barter value of pre-monetary systems, in which bartering was used to determine a value of a good or service. Economists, strictly speaking, view price as an exchange ratio between goods. Thus it exists also in a barter system. From this point of view, price is akin to opportunity cost, that is, what you have to give up in exchange for the good or service that you are purchasing.
List of Marketing Topics List of Management Topics List of Economics Topics List of Accounting Topics List of Finance Topics List of Economists