...economics is not physics so I don't think the same standards, e.g. prediction, should be applied. As far as we know there is no fundamental force exist that govern social interaction as there exists in the physical world that govern physical interactions.
This reminds me of "psychohistory" from the Asimov Foundation series. The premise goes something like, although one cannot predict the behavior of an individual, one can predict the behavior of a large group, and the larger the group the more accurate the prediction.
Fiction, of course...