Patent ID: 6866193

Claim:
An independently mobile shopping cart, which is movable in a shop to collect and purchase one or more commodities, comprising: a cart body for carrying the one or more commodities; and a payment processor for handling a payment for the commodities with a prepaid card, having a commodity code reader for reading a commodity code applied to the individual commodity, a commodity price identifying section for identifying the price of the individual commodity based on the commodity code read by said commodity code reader, a prepaid card reader for reading information about a current remainder of prepayment from the prepaid card, and a registering section for subtracting the price of the individual commodity identified by said commodity price identifying section from the current remainder of prepayment read by said prepaid card reader, and registering the result of the subtraction on the prepaid card as a new remainder of prepayment without any communication with an external processor or computer.