Which words refers to any system that uses an exchange medium and mdashwhether it's a precious metal or government-printed paper and mdashthat can be traded for other goods?

The term that refers to any system using an exchange medium, whether a precious metal or government-printed paper, is "currency." Currency serves as a medium of exchange, a unit of account, and a store of value, facilitating trade and economic transactions. It can exist in physical forms, like coins and banknotes, or in digital formats.