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It may be a contributing factor but I don't think it's the only cause. It may not even be a significant cause. I would put the blame firstly on degradation of the education system. Maybe the changing of people's main source of education from schools to media could be the cause.
People also have the free will to not consume those certain types of media as well.
'Corporate' is vague: monopolistic, monopolistic competition, & disperse markets> different effects. In former, corporations experience weak incentive to provide rich information (requires critical thinking); in the latter, the most. In conclusion, effect on consumers related to number of companies
The Flynn effect may have come to an end.
Flynns Effect only measures IQ which has a direct relation to the rise of accessible education (not media). The argument is in relation to critical thinking, not IQ. Two separate things.