Fungibility

Interchangeability of a commodity

In economics and law, fungibility is the property of a good or a commodity whose individual units are essentially interchangeable. In legal terms, this affects how legal rights apply to such items. Fungible things can be substituted for each other; for example, a $100 bill (note) is considered entirely equivalent to twenty $5 bills (notes), and therefore a person who borrows $100 in the form of a $100 bill can repay the money with twenty $5 bills. There is no requirement to return the same $100 bill. Non-fungible items are not substitutable in the same manner.

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