For most of the last couple of years, whenever I listened to or watched a newscast, it was almost all about COVID. Then, a month or two ago, it switched to being almost all about Russia invading Ukraine. There was a time when it was almost all about immigrants.
I've had several broadcasters tell me that there are companies whose sole job is to measure the listening/watching audiences for broadcasts - and that whatever people are listening/watching is what guides them. In other words, the more we listen/watch stories about ITEM A, the more of ITEM A stories they will broadcast.
Does all of that, taken together, mean that we the people get caught up in a particular story and can't get though of it, then after a while we get tired of it and start being consumers of different news? We get tired of the news and stop watching, so they start showing us something different that maybe we will watch?
As far as I know, there is no similar measuring technique for newspapers. We do not know how many people read a particular story.