What circumstance would corn be considered a commodity?

Corn is considered a commodity when it is produced in large quantities and sold on the market without differentiation from other corn. This typically occurs when it is traded on exchanges, such as the Chicago Board of Trade, where it is standardized in terms of quality and grade. Additionally, corn becomes a commodity when it is used as a raw material in various industries, such as food production, animal feed, and biofuels, making it widely interchangeable. The market dynamics of supply and demand also play a crucial role in categorizing corn as a commodity.