The second assumption is that doctors prefer the prescription form of Acid-Ease for the reason that it is in fact more effective at relieving excess stomach acid. However, doctors may have preferred Acid-Ease for reasons other than its effectiveness. Perhaps Acid-Ease is produced by a larger, more familiar drug company or by one that distributes more free samples. For that matter, the medical community may have simply been mistaken in thinking that Acid-Ease was more effective. In short, the number of prescriptions by itself is not conclusive as to whether one product is actually better than another.
The third assumption is that the milder non-prescription forms of Acid-Ease and Pepticaid will be analogous to the full-strength prescription forms of each. But this might not be the case. Suppose for the moment that the greater effectiveness of prescription Acid-Ease has been established; even so, the non-prescription form might not measure up to non-prescription Pepticaid. This fact must be established independently.
In conclusion, this ad does not provide enough support for its recommending non-prescription Acid-Ease over non-prescription Pepticaid. To strengthen its argument, the promoter of Acid-Ease would have to show that the comparison between the number of prescriptions is based on the same time period; its effectiveness is the main reason more doctors have prescribed it, and the comparative effectiveness of the two non-prescription forms is analogous to that of the prescription forms.
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