Every business of a bank is profit-driven, and a big profit of a credit card is the interest income of deferred accounts. What does this income mean?

firstly, the merchants have to pay a handling fee when the cardholder makes a purchase. Second, when the cardholder makes a large amount of consumption and has repayment pressure recently, he asks the bank to pay by installment, which means that the bank will charge an installment fee. Third, the cardholder pays the minimum repayment. When the cardholder has no repayment ability this month, he can repay the minimum repayment amount to the credit card, which is generally 1% of the amount owed. However, the bank will charge interest at a rate of 15, per day according to the total amount owed by the cardholder in that month, and compound interest next month! That's why credit card bills are rolling up. Fourth, cash withdrawal at the bank counter or ATM also requires the cardholder to pay the handling fee. Fifth, the annual fee of credit card, the cardholder needs to pay the annual fee to the bank's credit card, but some banks will exempt the cardholder from the annual fee by swiping the card for the purpose of promoting consumption. From these functions, we can see why banks issue credit cards.