These works primarily dealt with fat tailed distributions originally discovered by Benoit Mandelbrot and expanded upon in Peters (1991 and 1994).
These probability distributions are considered fractal because they are self-similar over different investment horizons once adjusted for scale.
[2] His books include Chaos and Order in the Capital Markets (According to WorldCat, the book is held in 813 libraries,[3]) Fractal Market Analysis (held in 580 libraries[4]) and Patterns in the Dark: Understanding Risk and Financial Crisis with Complexity Theory.
[5] That hypothesis suggests that financial markets are stable and efficient when participants have diverse investment horizons, that that prices reflect the interplay of these horizons, and market instability arises when short-term investors dominate and disrupt that balance.
[6] Recent research has supported the FMH as well describing the Global Financial Crisis of 2008 as well as Tech Bubble of 2000.