“The usefulness of a thing makes it a use-value.4 But this usefulness does not dangle in mid-air. It is conditioned by the physical properties of the commodity, and has no existence apart from the latter. It is therefore the physical body of the commodity itself, for instance iron, corn, a diamond, which is the use-value or useful thing. This property of a commodity is independent of the amount of labour required to appropriate its useful qualities.”

“The usefulness of a thing makes it a use-value.4 But this usefulness does not dangle in mid-air. It is conditioned by the physical properties of the commodity, and has no existence apart from the latter. It is therefore the physical body of the commodity itself, for instance iron, corn, a diamond, which is the use-value or useful thing. This property of a commodity is independent of the amount of labour required to appropriate its useful qualities.”

— Karl Marx