There is one final filter that Noam Chomsky and Edward Herman do not include in their in their 1988 book Manufacturing Consent that I think is worthy of addition, and that is the changing class nature of journalists and the professional paths that have developed.
Journalists in the past could enter the profession with little formal education. They could join a newspaper after high school as copy boys (and be essentially gofers), and then work their way up the ladder to become full-fledged reporters. They pretty much learned their profession on the job, by observing the reporters in the newspaper and being mentored by them.
An important consequence of this kind of career path is that the profession was open to a wide array of people. In particular, there was little in the way of barriers, especially income and wealth barriers, to entry in the profession. Furthermore, the very fact that journalism was so open made the profession less desirable to the members of the professional classes and people in the upper income brackets. Such people were more likely to steer their children to the prestigious professions of medicine and law and the corporate world.
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