Note: the news cycle has shrunk enormously. From 24 hours, now we are on a few minutes (or even real time) time frame. The line between entertainment and 'real news' has blurred substancially. Q: if you don't know that the story is there, how do you know what to look for? This is one of the problems with the media setting the agenda.
In economics, the concept of a market is any structure that allows buyers and sellers to exchange any goods, services and information. The exchange of goods or services for money is a transaction. A market...
Since the media has to satisfy the market and the news cycle is supposed to be quick, sometimes they have to 'fill in' with other stories.
'objectivity' (there is none)
The audience has inherent biases and interest itself. Many spectators (most of them, actually) look for pieces of news that reinforce what they already believe.