<prompt> Human: Every day I see news updates saying the market ended down as investors reacted to Cyprus or market is up based on the release of the US jobs report.Where does this come from? Is it a matter of simple correlation the biggest news of the day is X so the reason for market change must be X? Do they survey investors who traded on that day to see what people are saying?In other words, is the reason for market change based on anything or is it plucked out of thin air like so much other market analysis?  <response>: They just pick some news story thats happening at about the same time especially if its financial news, but not always and say they are linked. Most often there is no real linkage, but just by reporting it that way they become linked in peoples minds. Human brains like explanations, so we make stuff up. 