Someone earlier said it best. First, define the terms.
What does it mean to say "the markets are predictable," or "the markets are random," or "the markets are both?"
Pi is predictable, without fail. Is the Pi sequence random?
If the markets are predictable and not random, as some allege, why can't anyone here predict whether the sp500 will close up or down the next trading day, for the next year, without fail?
Could it be that it has both predictable and random components, as I've alleged?
Really and truly, everything in the universe, above the quantum level, has a cause and is not random. Lottery balls are governed by their initial starting positions, gravity, air flows, newton's laws, etc. They are not truly random. BUT, it is such a complex system, they we simply refer to them as being random draws.
Again, semantics. Everything thing above quantum level has a cause and effect in this regard, so nothing is truly random. However, the causes may be unknown and unknowable within sufficient time to make 100% accurate predictions. So, for such complex systems, we simply
refer to them as being random.
Finally, let me be clear as to my opinion: The markets encompass so many factors as to make any entity having all of the causes and their values, currently impossible. As such, no one can predict the markets with 100% accuracy. The missing information adds a 'randomness' to the markets. However, The markets aren't totally random as some information regarding the causes can be known. Thus, the markets may be predicted with greater than 50% accuracy. The accuracy one would expect in a completely random system. (But again, less than 100%, the accuracy one would expect in a completely non-'random' system.
As I've stated in the beginning, both random and non-random.
