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How can the Samsung Upgrade Programme offer 0% APR?
This is more a question about economics than about personal finance. The answer, though, is straight-forward. Samsung makes enough profit on the phones that they are willing to eat the costs of a 0% loan, with the attendant risk of non-payment and the loss due to inflation. By offering financing, they expect to sell more phones. So, it's a slight cost to Samsung, but one they can easily afford due to the markups and increased volume of sales.