This is an old joke, but I find it both useful and amusing:
A normal person walks down the street. He sees a $100 bill laying in the street, he picks it up and continues on his merry way. An economist who sees a $100 bill laying in the street continues to walk knowing full well that the market is efficient and if it truly was a $100 bill someone would already have picked it up...
In other words: not all experts know what they are talking about; and sometimes things are really what they seem (except for when they aren't, of course...).
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