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Yes. It's all luck.
Not according to those who thrive on their ability to "play" the market. I have been told that if you can acquire the ability to read market trends successfully, you can make a pretty good living.
I am not one of those who can read market trends, that is why I pay a professional to do it for me. I have not done too bad over the years, better than some but worse than others . . . I would guess I am average.
A "random walk" is a statistical calculation. It's essentially saying that the EMH is true but that there are no adaptive trends being applied within the market itself which could be observed and reflected in stock values. I'm pretty sure that the stock values are in fact behavioral effects rather than random, but even if they are randomly determined over time, there still appear to be short time gains to be had by applying a behavioral assessment (basically: look at what "everyone else" is doing and do something else).
The same trend tends to work when running in an NCAA pool, where similar information to stock prices exists.