"> modeling a particular market force that has been difficult to capture in previous models. Empirical evidence shows that, when a stock return is fluctuating in the short term, there exists a market force that draws the fluctuating stock return back to its long-run equilibrium. This force is related to the concept of mean reversion, which is the tendency of a stock to return to its average price."<p>Talk of "market forces" and the like fall into the quantum voodoo school of economics, IMHO.
> a good approximation of the market force that restores a fluctuating stock return to equilibrium<p>Are we talking mean reversion here? A mathy example would be nice :-)