What stops someone from just selling a stock at every peak and buying at every dip? Wouldn’t you be making money either way the stock goes?
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How do you know it’s a peak or dip at the time? If it were that simple, lots of people would be rich from trading stocks. There are also what are called high frequency traders who trade millions at a time to make money even on changes of just pennies, but that requires access to super high speed networks directly into the trading exchanges to get best prices — Michael Lewis’s “Flashboys” book explains what they do pretty well.
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