Quote from alesanti:
What I don't understand is why people think that polarized way: predicting the markets is impossible because "there is no free lunch" or there is no "holy grail". In science, whenever you measure something you have to express the error that must always accompany the measurement. Analogously, if you say "I predict the price", surely you are not telling exactly the price, but the price within some error. Error that could vary in time.
The only way to show results in market prediction is to express some average degree of accuracy.
That level of accuracy should be enough to generate profitable trades systematically.
It may be impossible predict prices precisely, but it is not impossible predict prices profitably.