Although most countries now usea system of bank notes and coins, many different commodities have beenused as money by people in various parts of the world and at varioustimes 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。