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Not sure if I agree, although I'm sure it varies per person. I've been investing for > 20 years, and I enjoy watching the daily movement as it helps me keep a mental model of trends and performance. I seldom sell, but do buy regularly, and I think having this information frequently refreshed in my brain has helped my performance (of course, no way for me to do an A/B comparison there, so I can't assert it as fact).

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A Buffett story you might find interesting. He refuses to look at the stock price of any potential investment while he is doing his valuation for it.

His thinking is if he falls in love with the business while reading their financial reports, and he knows the stock is trading at $10, he’s subconsciously influenced to bias his valuation estimate over $10, because he wants to buy it.

So he waits to ensure his valuation is as unbiased as possible, and only when finished checks the price. Kind of like the excitement of opening a present at XMas, not knowing if it’s a lump of goal or new AirPods.

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