How can there be such a diversity of opinion on the economy?

I heard a joke on CNBC this morning about a guy jumping out of a window and as he is falling down 50 floors, he passes a window and a guy shouts out "hey...wow how's it going?" to which the fallee replies "good so far". 

Around this little joke is a one guy who says that the sky is falling and things are going to get bad once more and another who is convinced the dark clouds are behing and we are bouncing up all over.  I wonder how this can be...how two market/economy figures can look at the same data and concluded 180 degrees from each other.

This kind of thing drives laymen like me crazy.  Its like investment broker types when the market goes south for a week saying its a good time to buy and when it is surging north its also a good time...so there is never a bad time?  How about saying its a good time to sell once in a while...although buy v. sell recommendations are about 8:1.   It must have been a good time to sell when the market was 14000 and everyone on the street knew there was trouble on the horizon.

I can't figure it out.

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