Why can commodity future contracts be bought and sold on an open market?

Commodity futures contracts can be bought and sold on an open market due to their standardized nature, which allows for easy trading and liquidity. These contracts specify the quantity and quality of the commodity, as well as the delivery date, making them fungible and accessible to a wide range of investors. The presence of a centralized exchange facilitates transparent pricing and reduces counterparty risk, encouraging market participation. Additionally, the ability to hedge against price fluctuations further enhances their appeal to both producers and speculators.