"We have a frank confession to make. The automobile you bought from us was not really as good as we said. But now we have new patents and are putting out a superb machine. Just take our word for it."
"Did the suit we sold you wear out in a month? That was because our materials were no good. But now we are buying better materials."
"We are sorry that our baking powder made you ill. We feel sure we have found and corrected the cause."
Advertisingmen last week had fun making up such hypothetical copy as the above. For if all companies followed...