1. A system for differential customer promotion in a retail establishment comprising: a terminal for entering customer transaction data at a point-of-sale; a bar code reader for detecting the universal product code on products purchased by said customers; a memory for storing said customer transaction data regarding a plurality of individual customer's shopping visit histories and specific product purchases over a period of time; a processor responsive to said stored customer transaction data for generating incentive signals for different customers, said incentive signals having different values in dependence upon different shopping histories of said customers prior to the current shopping visit, said incentive signals also designating product incentive awards based upon a specific customer's purchases of products prior to the current shopping visit; and a device for issuing coupons at the point-of-sale in response to said incentive signals, said coupons related to the customer's prior product purchasing history and the value of said coupons being related to the customer's prior shopping history, such that different incentives can be delivered to customers with different shopping histories and different product purchasing histories.