With all the financial models and tools that are available, one might believe that finance and market behaviors are fully determined. This is the "random-walk" theory of market behavior. All events are instantly "priced-in" and the fluctuations are random. Yet, there are legions of individuals who follow trading systems to "beat the market". So what's your view is market trading a hopeless zero-sum game? Are the Random-walker's right? Or is there something more to market behavior?