Alexander Farnsworth The one thing about Walmart (NYSE:WMT, NEOE:WMT:CA) if you’ve followed them over the years (and this blog has modeled the financials since 1995), is that the retail giant is always innovating, sometimes transparently and sometimes internally. In the late 1990s, it was RFID (radio frequency identification devices) chips, which were used to track inventory on Walmart trucks, and it was thought Walmart merchandisers could track every pallet of every item, moving around the country. Wal ...