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 whats your view is market trading a hopeless zero-sum game? Are the Random-walkers right? Or is there something more to market behavior?