While I agree with you about the latter part, Jacks point is not saying this is not true but asking us to site evidence for our claims (A very reasonable request IMO)
I will try to find my citations myself but I can make no promises - It has been a while since I looked into this issue and did not keep tabs on what I found.
Studies reveal dual pricing strategies - comparison of Wal-Mart Stores Inc. prices with other discount stores in six U.S. cities - Wal-Mart | Discount Store News | Find Articles at BNET
Wal-Mart's Price Strategy - CheatHouse.com
"Every store manager has authority to lower prices if he sees the store across the street selling for less. If you have to lower the price, you lower it."
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