Fractal markets hypothesis
From ACT Wiki
(FMH).
The fractal markets hypothesis is an evolving model of investor and market behaviour which identifies repeating patterns in market prices and conditions.
The FMH may explain why extreme negative (and positive) outturns are observed more frequently in real financial markets than predicted by simpler efficient market models.
If the FMH is borne out in practice, then real financial markets are significantly less stable than predicted by more traditional market models.
