A controller is in communication with a plurality of vendors that are servicing customers, as well as with a plurality of “subsidizing” vendors seeking access to those customers. The controller receives from a first vendor an indication of one or more items that a customer is to purchase. In response,...http://www.google.cl/patents/US7818284?utm_source=gb-gplus-sharePatent US7818284 - Method and apparatus for providing cross-benefits via a central authority
