A human is irrational and wildly unpredictable, but groups of people (like most animals) are more easily predicted. While it's difficult to predict a specific s

A human is irrational and wildly unpredictable, but groups of people (like most animals) are more easily predicted. While it's difficult to predict a specific stock, it's easier to predict trends given global situations, within a certain time frame, with enough information. The main problem becomes having access to such information. So much of the economy is global now, and behind closed doors, that information is unavailable or at a premium.