The market has established that demand-supply conditions do exist, but not as singular curves pointing to equilibrium. Rather, the price-product, supply-demand relationship (Figure 5.3) exists within a domain between limitations. It is well known that advertising stimulates demand and moves the threshold of demand from one position to another. An advertising campaign that builds on brand identification, for example, can increase from a D1 to a D2 position, thus permitting higher volumes at the same or even higher pricing. At the same time a manufacturer does not have a finite limit to output but can vary it, depending on demand, from one level to another, between an S1 and S2 output.