USE-VALUE vs. EXCHANGE-VALUE: The usefulness of a commodity vs. the exchange equivalent by which the commodity is compared to other objects on the market. Marx distinguishes between the use-value and the exchange value of the commodity. Use-value is inextricably tied to "the physical properties of the commodity" (126); that is, the material uses to which the object can actually be put, the human needs it fulfills. In the exchange of goods on the capitalist market, however, exchange-value dominates: two commodities can be exchanged on the open market because they are always being compared to a third term that functions as their "universal equivalent," a function that is eventually taken over by money. Exchange-value must always be distinguished from use-value, because "the exchange relation of commodities is characterized precisely by its abstraction from their use-values" (127). In capital, money takes the form of that equivalence; however, money in fact hides the real equivalent behind the exchange: labor. The more labor it takes to produce a product, the greater its value. Marx therefore concludes that "As exchange-values, all commodities are merely definite quantities of congealed labour-time" (130).