Although most countries now use a system of bank notes and coi , many different commodities have been used as money by people in various parts of the wold and various times in history.

• 虽然大多数国家目前实行一种钞票和硬币的货币体系，但在世界不同的地区和不同的历史阶段，许多各式各样的商品也都充当过货币。