Depends on what you mean by "most powerful." If by powerful, you mean "the medium that works the best," then I have to say, when used correctly, radio is easily the most powerful. Audio is the most easily retained, and repetition of your advertising message is the key to building recall in the minds of your collective audience. The best and most cost-effective medium to achieve that is radio, no question.
Answered Fri 22 Jul 2011, at 12:38PM
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What do you think is the most powerful medium of advertising?