Sorry but a citation is not needed, they have poured vast amounts of money into IT infrastructure, logistics, supply/demand, warehousing, POS, RFID, the list g

Sorry but a citation is not needed, they have poured vast amounts of money into IT infrastructure, logistics, supply/demand, warehousing, POS, RFID, the list goes on. How do you think they became so large? Technology you take for granted everyday started out funded and developed by Walmart (usually in collab with IBM, TI, etc). They have brought money and the desire to the table in tech for over 40 years, often pushing the envelope of what's even possible.