The document discusses the history of money and how bartering was used before modern currencies. Under bartering, people would directly exchange goods and services without a standard medium of exchange. Bartering was inconvenient as the items being traded had to be immediately exchangeable and transporting bulky or heavy goods was difficult. The document then defines money as anything widely accepted as payment for goods and services, which serves as a medium of exchange, store of value, and standard for deferred payments.