.which is an example of a commodity
Commodity money is a form of money with an intrinsic value. Some of the best examples of commodity money are silver and gold coins. Currency(cash) or banknotes do not have intrinsic value and are virtually worthless in itself. It only has value because society views it as a unit of exchange. This type of currency is called fiat money.
Commodity value is of particular significance in the study of currency. For example, the commodity value of a coin is the value of the metal of which it is made. Gold and silver coins have a high commodity value, whereas fiat coins such as modern day quarters have a low commodity value. This is of particular historical relevance when analyzed in light of Gresham's Law.