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Why is it not a requirement for companies to pay dividends?
The shareholders have a claim on the profits, but they may prefer that claim to be exercised in ways other than dividend payments. For example, they may want the company to invest all of its profits in growth, or they may want it to buy back shares to increase the value of the remaining shares, especially since dividends are generally taxed as income while an increase in the share price is generally taxed as a capital gain, and capital gains are often taxed at a lower rate than income.