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It actually does. Bringing people to believe that they need certain things to happiness, to be impressive, to be good people and to be safe. Those who control media convince people to need what media offers.

To convince someone that they are lacking a product to be happy, for the sake of discussion, is the same as telling them they are unhappy. What if this person was already happy before hearing the ad? Then it becomes manipulation.

With persistence and repetition people would start to believe that their lives are not what they are supposed ro be. Another point is that they offer their products as a solution to low self esteem, confidence and whatever someone believes he lacks.

Indeed. The other side of the equation is people tend to be overconfident of their actual abilities. So for these people, their self esteem is not always built on solid ground. They are prone to "attack" in this manner.

But hang on. Is this really the rule of the herd or is it major corporations knowing how they majority thinks and just exploiting it?

Its the second one, You can watch a documentry called The Century Of The Self, a 4 parter on pootube. Youd be amazed at how masses are made to do things they dont really want to do !