Virtually every corporation within a broadly defined industry offers products that are differentiated from those of others in some ways that provide them the market advantage they have. In particular, Knight (1965, p.xxii) suggested that “ nearly all suppliers of economic goods and services, outside of a few fields in which the identity of the seller is lost or production is according to specifications, enjoy some degree of monopoly. Each has a monopoly within a certain area, and competition is effective only at the boundary between market areas.” Some clarity with respect to the dimensions that provide monopoly to a firm within the framework of differentiated oligopoly is necessary.