Source
Rebecca Borné | Center for Responsible Lending

Financial institutions charge large fees when a customer’s checking account doesn’t have enough money for a purchase but the bank pays the transaction anyway. Instead of declining the transaction, as many customers expect banks would, the bank often “covers” the amount and adds a fee, typically as high as $35. This practice is particularly egregious on debit card transactions, which the bank could easily decline at the point of sale, which would result in the consumer’s paying no fee at all.

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