How did media coverage of the war change as the fighting continued?
and this is for the vietnam war.

The media coverage during the Vietnam War gained popularity since more than half of the Americans have television. It became more engaging to see news in front of the audience's eyes than to read the newspapers. The evening news was more of the war than any other tv shows.

The negative effect of it was more people were ready to accept the news presented to them and loose understanding of the facts on their own.

high entry costs prevent new producers from entering the market.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.