A system and method for providing an incentive to a cutomer of a store to return a shopping cart to a cart return location. The cart return location, such as a cart corral, has a plurality of detection loops at an entrance to the corral. The system detects a change in inductance of the loops when a cart...http://www.google.de/patents/US6486768?utm_source=gb-gplus-sharePatent US6486768 - Cart return loyalty credit system
