Fungible refers to something that is interchangeable or replaceable, such as a commodity or asset. In other words, it means an item can be substituted for another of the same type and quality without any change in value.
While it's true that books are viewed as fungible commodities, that's nothing new. (libbyhellmann.com)
They don't seem to care either way («data dependent» has become just as fungible as «transitory»). (alhambrapartners.com)
That's why it's a mistake to build your portfolio in such a way that you have to accurately predict the future direction of fungible goods like oil, interest rates or gold. (tsinetwork.ca)