Literally millions of market decisions are made each day, and the results of each one has its effect on price movements. The idea that such a complex set of components, which includes free will, can be modeled and predicted with mathematical exactness is laughable. You can never predict with absolute certainty how the collection of individuals that make up the markets will react to events nor what new conditions will arise. But there is order to the chaos, and it is the speculator’s job to find it
I am also looking into Algo/HFT and finally found some decent information at stackoverflow.com and a link to:
I hope its better than the last 4 books I read on HFT/Algo trading.