| 摘要 |
A revenue-producing, charge card system also manages account balances to create an investment profit for the card holder [Fig 1] A trust account has a trust-account balance reflecting a first amount of funds, is constructed to subsequently record debits and credits related to the balance, and is constructed for access via remote communication [Fig 2] A bank account has a bankaccount balance reflecting an initial zero balance, is constructed to further record debits and credits related to the balance, and is constructed for access via remote communication [Fig 3] A debit card is constructed for communication with the trust account and the bank account, and a switch is in communication with the trust account and bank account [Fig 4]
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