The world market and crises. I. A commodity is something that is outside of a human being that satisfies some sort of want or need. The quality aspect is its use value. The use value is the utility of an object. This value is independent of the amount of labor required to make use of its qualities.
Use values are only a reality by their use and consumption.
The second perspective of quantity relates to exchange value. Exchange values do not deal in quality and express a purely quantitative value. Exchange values of a particular commodity express an equivalent relationship. Also exchange values are expressions of another thing, something that is contained in the objects to be exchanged. This common thing is labor- human labor in the abstract.