Ray,
if you know a random processes of a stock have the properties of long memory processes, how to make money from that ?
How to find such a process ?
you can test for autocorrelation in the residuals; this has been used in tests of market efficiency ("a non-random walk down wall street"...?).
i guess the number of lags is the length of the memory.
I'm about to look at the aformentioned article and i have a ruther idle question. Are multifractal measures continuous? I mean do they satisfy the fifth axiom of the probability theory (A.N. Kolmogorov)?