The Philosopher Karl Popper, whom Soros, as a young man, studied with at the LSE, influenced him deeply. That influence is clearly evident in Soros' development of "Reflexivity" to explain why real markets, most of the time, deviate far from what is expected according to modern economic theory. According to Soros, the "efficient markets theorem", is not applicable to real markets, which are irrational and tend to move away from, rather than toward, equilibrium. It is clear that Soros believes disciplined philosophic reasoning is far more useful in explaining how human behavior influences markets than are economists' mathematical models.
A summary of Soros' Reflexivity theory and his personal views on market behavior is contained in the series of lectures he gave at the Central European University, a University he founded and endowed. (These lectures can be viewed on the internet and have also been published.)
Today, George Soros is the world's most public and important philanthropist. He has been a tremendous force for good in many countries. He will leave a lasting mark not because of the money he made but because of what he did with it.