A system for gathering data on behavior of shoppers in a retail market. A scanner is attached to a shopping basket, and detects (1) removal of an item from a shelf, (2) the identity of the removed item, (3) insertion of an item into a shopping basket, which may be the identical item removed from the...http://www.google.com/patents/US6659344?utm_source=gb-gplus-sharePatent US6659344 - Automated monitoring of activity of shoppers in a market
