The companies that advertise products believe so, as do many of the advertising companies.
Many people are persuaded to by certain products because of advertising, others are not.
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You can think about what they are trying to sell. What demographic are they reaching. Can the product really do what they claim?
If you are talking about the commercial from the 70's it was Gravy train.
Any axe commercial
Consolidated Credit UK TV commercial is voiced over by Darren Altman. The commercial can be seen on Sky TV and Channel 5.
It's a Weight Watchers commercial :)