Fungibility Fungibility In economics, fungibility is the property of a good or a commodity whose individual units are essentially interchangeable. For example, since one kilogram of pure gold is equivalent to any other kilogram of pure gold, whether in the form of coins, ingots, or in other states, gold is fungible. Other fungible commodities include sweet crude oil, company shares, bonds, other precious metals, and currencies. Fungibility refers only to the equivalence of each unit of a commodity with other units of the same commodity and not to the exchange of one commodity for another, which is barter. The word "fungibility"
United States Commodity Funds United States Commodity Funds United States Commodity Funds LLC (USCF) is a US company based in Oakland, CA, specializing in managing exchange-traded commodity funds, which are often referred to as commodity-based exchange-traded funds (ETFs). USCF was one of the earliest issuers of exchange-traded commodity funds in the United States. It is best known for launching in 2006 the first crude oil based exchange traded commodity fund in the United States, United States Oil Fund, LP (ticker: USO), as well as launching in 2007 the first natural gas exchange traded commodity fund, United States Natural Gas Fund, LP (ticker: UNG). USO