Very true, dubstock. However, a few days before any such news, good or bad, you'll very likely see some movement in the stock. It's called illegal insider trading and it can be the true precursor to what is to come. Technical analysis can be helpful in identifying these moves.
In hindsight, there was trading that should have warned us before last October's crash. As I recall IIverson, a technical guy, was able to spot the danger and issued a warning.
Fortunately for those involved in such insider trading, the SEC will likely let it ride.
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