How advertising trend has changed? (From earliar times to this new century)?

please explain in brief that how advertising trend has changed. In earliar times, client was not so literate, he used to agrees to what the advertiser used to design for him. or we can say now we have so many agencies compared to the earliar times and more over now we have highly qualified Ad makers, so there... show more please explain in brief that how advertising trend has changed.
In earliar times, client was not so literate, he used to agrees to what the advertiser used to design for him.
or we can say now we have so many agencies compared to the earliar times and more over now we have highly qualified Ad makers, so there emerges a stage of competition between the agencies.

please notify me all the points which throw some light on my question "How Advertising trend has changed ?"
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