Complex systems in these capital markets meet with the property prices keep processes and issuance of shares with autocorrelation fractal marketability and can be designed in great detail, small changes or fluctuations.

They can be amplified using iterative processes and create the qualitative changes in the macro level. Prices and immense variety of actions, constantly influence and create macro models to influence individual agents, the entire process constantly moves between the micro and the macro behavior result new structures emerge, is the opposite with the iteration of a linear system which can only lead to an increasing sequence or a sequence which converges.

One of the most spectacular features of these fractals is that they are not derivable in all points.

Behavioral Economics would be the other major school of thought: the idea that people exhibit certain kinds of behavior that are probably inconsistent with rationality. These behaviors lead to certain well-documented facts in the markets that are not consistent with market efficiency. Richard Thaler just published a book on Behavioral Economics: "Misbehaving".  I intend to read this book soon, but a Wall Street Journal review of this book found it very readable, entertaining, and insightful.