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How are dividends for shareholders of banks paid?
A typical manufacturer buys raw materials, produces a product using labor and energy at a specific cost with some waste, and then sells the product to produce income. A bank buys raw materials (deposits) by paying interest, then uses labor and energy to turn a portion of the raw materials into their product (loans), they then receive income (interest) on those loans. If the income exceeds the cost to buy and produce the loans taking into account losses due to delinquencies (waste) the bank company has made a profit. The growing profits can lead to an increase in stock prices or the paying of dividends. The search for more raw materials can lead to paying more for the raw materials, or by buying other factories (branches) or even other bank companies.