Everything you need to know about Jeff's strategy is in this book: http://www.amazon.com/Sam-Walton-Made-In-America/dp/05535628...

Different medium and market, but basically the same overall strategy.

A lot of what I knew about Walmart came from third party sources (activists, whatever), so I decided to go to a primary and read Sam Walton's book, and I must say it gave me a new appreciation and understanding for the vast machine that is Walmart. I highly recommend it:

http://www.amazon.com/Sam-Walton-Made-In-America/dp/05535628...