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Why do financial institutions charge so much to convert currency?
Banks do of course incur costs on currency transactions. But they're not as high as the fee charged to the customer. Most banks in most places lose a lot of money on operating bank accounts for customers, and make the money back by charging more than their costs for services like currency exchange. If you don't choose to pay those fees, use an online service instead. But bear in mind that if everyone does so then banks will be forced to charge higher fees for current accounts.