Many credit cards in the same bank are shared by quota. All credit cards of the same bank held by the cardholder share the same quota, which is "quota sharing". If a user applies for multiple credit cards in a bank, they are all "shared", and the credit limit cannot be accumulated, so the maximum credit limit can be shared. For example, you have two credit cards of Agricultural Bank of China with a credit limit of 2000 yuan. When you use this bank's credit card to overdraw 500 yuan, your remaining 1 credit card leaves only 1.500 yuan to overdraw.