"News" is the difference between what happens and what you expected to happen. If you have rational, and hence unbiased, expectations, then the news, on average, should be neither good nor bad. The good news and the bad news should cancel out.
So why does the news that gets reported seem mostly bad news? Does bad news sell more newspapers than good news? Are newspapers biased?
Suppose reality is skewed. The distribution of the news has a zero mean by assumption, if our expectations are unbiased. But suppose the distribution has a long tail on the bad news side, and a short tail on the good news side. And suppose newspapers only report on big news, that's (say) one standard deviation or more away from the mean. Then most of the news reported would be bad news, because there are very few good news stories that are big enough to be worth reporting, just lots and lots of little good news events. "There were no serious accidents today on highway 401" never makes it into the newspapers.
But why should reality be skewed? That's the tricky question. But I think I can answer it.
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