The Concept: Sometimes repetition alone can make a message more believable. Social research has found that people tend to eventually believe things they’ve been told many times, simply because they’ve repeatedly heard it. Studies show that people rate false statements such as “Mercury has a higher boiling point than copper” as true if they were made to read them a week before.
How You Can Use It: This concept is why companies run the same advertisement three times during a one-hour television show. The first time the audience sees the ad they might just ignore it. However, a week later they may have seen the ad 20 times, and by that point they have begun to accept its message and view favorably the product it advertises.