Any mistakes in life are normal; in fact, they’re good if a person draws conclusions, learns the lesson, and changes. If a person doesn’t draw conclusions, the lessons will only get more painful each time, until they finally understand. Then comes the next level. Yes, it’s truly a lifelong learning process.
As for constant selling... Yes, most people act predictably: they sell when prices are low and buy when they’re already too high (here, the price range matters). This is what’s called pattern thinking.
A major problem for people is their "hungry brain," in many different senses.
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