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Why is it not a requirement for companies to pay dividends?
You have plenty of good answers, but I want to add something that might help you grow your intuition on stocks. There are a lot of differences between the example I am going to give and how the stock market actually runs, but the basic concepts are the same. Lets say your friend asks you if he can borrow some money to start up a company, in exchange you will have some ownership in this company. You have essentially just bought yourself some stock. Now as your friend starts to grow, he is doing well, but he needs more cash to buy assets in order to grow the company more. He is forced with an option, either give you some of the profits, or buy these assets sooner. You decide you don't really need the money right now, and think he can do a lot better with spending the money to buy stuff. This is essentially the same as a company electing to not pay dividends, but instead invest into the future. You as a stock holder are fine with it since you know the money is going toward investing in the future. Even if you never get paid a dividend, as a company grows, you can then turn around and sell the stock to someone else for more money then you gave originally. Of course you always take the risk of having the company failing and loosing some if not all of your investment, but that is just the risk of the market.