Technological aspects and early clinical experiences are arousing great enthusiasm over magnetic resonance imaging (MRI). However, influences such as regulation, reimbursement, and increasing competition also are playing important roles in determining the diffusion of this new technology. Of these considerations, competition among providers seems the most important. Competition related to MRI is manifested as direct competition over MRI services, using MRI to improve a provider's strategic position and competition among specialties. In making decisions concerning MRI acquisition and operation, providers are drawing upon their experiences with computed tomography (CT) to help them determine when would be the best time for acquisition, how to decide whether acquisition is appropriate, and how best to acquire, operate, and market the technology.

“Imagine A rather short-sighted person told to read an inscription in small letters from some way off….' So begins the quest for “the real nature of justice and injustice” undertaken in response to the challenge of Glaucon and Adeimantus to show that “justice pays”. It is often alleged that the search leads through analogy to a monster “organic” state that lives by devouring individual rights. I believe that these charges are mistaken. Plato's political theory does not derive from an analogy which makes the state a monster individual with interests superior to and independent of those of ordinary citizens; it derives rather from a doctrine of objective interests discernible by those with special training and ability, interests which later thinkers (and perhaps Plato) have taken to be the object of a “real will”, unerring even where a person's mere empirical desires are shortsightedly misdirected. Plato identifies the interests of his ideal state with the objective interests of its citizens (so they are not independent), and in his harmonious world, metaphysics, moral psychology, and political organization combine to ensure that those interests need never override individual mundane interests (not superior) for they never conflict: they coincide. That the whole theory is dubious should not prevent us from seeing that just what the theory is may be clarified by examining the arguments which putatively lead to it, and that those arguments provide grounds for not confounding Plato's theory with others which may reach similar conclusions about political organization and obligation.