I'm just sitting here thinking about trading from a macro perspective... I assume there are many firms, hedge funds, etc. out there with vast resources including money, technology and highly educated brainiacs crunching vast amounts of data then executing various automated strategies with lightning speed. Take for example some type of mean reverting, stat arb strategy. Don't you think there are many firms doing very similar or exact type of strategy? Then you may have other firms that realize this so they take the opposite trade thinking the original system is going to break down because everybody is doing it. I guess what I'm saying is, with intra day traders, so much of the same things are being done and everybody is competing for the same shares. Wouldn't this create a chaotic market from a micro perspective? Still we have many traders on this sight making great money, year in and year out without access to all these great wonderful resources that the goldmans of the world have. Is it all about letting your trade/plan play out, which it will eventually because all this chaos will get you the shares you want, just be patient? So basically.. I don't get it. Its hard to wrap your head around all this from a big picture point of view.