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You have said investing in shares is a long-term thing, minimum of five years. You have also said "check your share price - say once a year, not daily". But in your yearly check up, if you find shares in one of your companies has fallen, should you sell, or should keep it for another two or three years? What if after two or three years the share is still dropping, should you then sell?

CS, Bristol

One should never sell just because the share price has fallen. Consider selling shares when something about the company has changed for the worse. The other reason to consider a sale is if you find a better home for your money. When to sell is one of the hardest decisions. But over the long term, a share price should reflect the underlying company's performance.

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