Or to put it another way: practically every product has a number of benefits that might be claimed. Commonly one of the benefits is more popular than the others, even more popular than the others combined. Therefore, it's imperative to do everything to make people understand the most important benefit, to achieve credibility and to avoid distractions. The aim is to have as high a percentage of people as possible take out of an advertisement what the advertiser intends to put into it. This is most likely to be achieved if a claim is articulated and proven with credible evidence—in a brief commercial, some kind of dramatic demonstration.