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If stock price drops by the amount of dividend paid, what is the use of a dividend
The stock will slowly gain that $1 during the year. Suppose we have the highly theoretical situation that a company's stock is worth exactly $10 right after it paid its dividend, its dividend is always $1 per stock, and the company and everything else is so stable that its value never changes. Then the stock value right before the next dividend is paid will be close to $11 -- after all, it's worth a certain $1 dividend the next day, plus the $10 stock. And in between, half a year after the dividend was paid, it will be in between, say $10.50, or actually slightly less than that (because people like to buy in late so they can make money some other way with the money first). But the point holds -- the price decrease on the day that dividend is paid had been building up the whole period before that decrease. So stock dividends do make you money.