This pharmacoeconomic analysis is used to justify the lower cost of treatment; wherein in preliminary clinical trials based on the fact that both methods of treatment (drugs) have an equivalent therapeutic efficacy. The advantages of this analysis is that it allows you to compare alternative technologies, choosing the cheapest, but its drawback is that it is a little impractical, since quite rare to find alternative therapies that have the same clinical effects, and differ only in value. How called this pharmacoeconomic analysis