The real danger from advertising is that it helps to shatter and ultimately destroy our most precious non-material possessions: the confidence in the… - Paul Sweezy

In possessing exchange value relative to one another, commodities show their unique characteristic. It is only as commodities, in a society where exchange is a regular method of realizing the purpose of social production, that products have exchange value.

Supply and demand will be in equilibrium only when the price of every commodity is proportional to the labor time required to produce it. Conversely prices proportional to labor times will be established only if the forces of competitive supply and demand are allowed to work themselves out freely. The competitive supply-and-demand theory of price determination is hence not only not inconsistent with the labor theory; rather it forms an integral, if sometimes unrecognized, part of the labor theory.

Under simple commodity production, to which we have so far largely confined our attention, each producer owns and works with his own means of production; under capitalism ownership of the means of production is vested in one set of individuals while the work is performed by another. Both means of production and labor power, moreover, are commodities; that is to say, both are objects of exchange and hence bearers of exchange value. It follows that not only the relations among owners but also the relations between owners and non-owners have the character of exchange relations. The former is characteristic of commodity production in general, the latter of capitalism only.