What is using corn cattle or cotton as a medium of exchange an example of?

Using corn, cattle, or cotton as a medium of exchange is an example of commodity money. Commodity money consists of items that have intrinsic value and can be used to facilitate transactions. Unlike Fiat currency, which has value primarily due to government decree, commodity money derives its value from the material itself and its usefulness in trade. This practice reflects early economic systems where tangible goods served as a basis for trade and valuation.