The present invention provides a system for implementing a loyalty program on a network-wide level. The system associates UPC and SKU data on a network level to reward consumers and/or to analyze the data for a variety of business purposes, such as market segmentation analyses and/or analyses relating to consumer spending behaviors or patterns, for example. In accordance with one aspect of the invention, the network may comprise any number of participants, including consumers (such primary and supplementary members of an aggregate consumer account), retailers (and any of their employees), manufacturers, third-party providers, and the like. In accordance with one aspect, the system enables participation by supplementary members who are associated with a primary member and, in this manner, facilitates the tracking of supplementary member purchasing behavior, reward points earning behavior, and reward points redemption behavior. In accordance with another aspect, the system permits instant enrollment of consumers at a retailer point-of-sale using information that the retailer has previously gathered from the consumer. In accordance with another aspect, the system facilitates the compilation of a purchaser profile, which may be used for a variety of purposes, including various types of marketing analyses.