| 摘要 |
The invention relates to a method for increasing efficiency in trade, wherein a customer, in order to obtain a product, a service, and/or the like, uses his/her own data processor (X) to establish over a communications line a contact (Y) with a server (A) which is at least in data transmitting communication with a service supplier (T), whereafter, as the connection has been established, selects, confirms and/or makes a payment for a desired product, service, and/or the like, whereafter the server (A), after the verification of personal, communications, credit information and/or the like, confirms that the purchase transaction has been conducted correctly and supplies the customer with a substitute verifying at least the authenticity of the purchase transaction. The customer's data processor comprises a portable communicator (X1), which is capable of establishing communication and which is supplied with a substitute (V) produced by the server (A) as the connection (Y) is established and preferably provided with a customer-specific identifier, for storing the substitute in the memory of the customer's communicator (X1) in electronic form.
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