"Every once in a while in the world of economics an economic indicator will suddenly go crazy. One day the charts all look normal and easy to understand. The next day it suddenly launches into an entirely different world. What a massive swing in the index means is always open to interpretation (a whole industry exists to analyze these movements), and no one is certain if they are correct until years afterward. Sometimes what it means is more obvious than the why, but the 'why' is ultimately more important."
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