In other words, you don't get rich from stock speculation by identifying the businesses whose profitability will grow the most - you get rich by identifying the businesses that *other investors* will pile into, pushing the price up. All you need to do is sell your shares *after* the price spike, but *before* anyone else figures out that the business is a turkey. It's like that old joke: "I don't need to run faster than the bear (market), I just have to run faster than *you*."
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