Lots of system consisting of discreet pieces can be modeled fairly exactly. The thing that makes economies very hard to predict is they're a combination of peo

Lots of system consisting of discreet pieces can be modeled fairly exactly. The thing that makes economies very hard to predict is they're a combination of people acting according to quantifiable economic incentives and people acting accord to a collection of ideas, fashions and emotions that can switch unpredictably or simply aren't known.