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Because it tries to predict human emotions (certainty, optimism, insecurity...) and human behavior (investing, buying, saving) with mathematical equations. Try predicting the behavior of your wife, husband, friend (you name it) with mathematical precision. Now try predicting the behavior of people you don't know and people who come from different backgrounds with mathematical precision. It's difficult to design a formula that takes all factors of human behavior into consideration.

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13y ago

What else can I help you with?