You need to be ready to respond to doubts created by your competitors' advertising. Doubts usually fall into two areas of concern from the buyer' s perspective. As you can see, the buyer's conscious mind sees doubts as information-based concerns or discrepancies. They say this, but I see or know something different. Even buyers would agree that their doubts can be erased by the addition of new information.
People get bamboozled all the time because they believe the explanation, even if it is farfetched.
That's because doubt often cannot be simply erased by new facts. It is more complex than that. Doubt, at its core, is not logical at all. It is emotional. I'll sell the other for 50-cents.