I found the following good news article relating to this topic at the link below.
At this website, you can go to another link where you can find a pdf document with the details of a complex study done by the Global Insight Group showing that shoppers can save $700 per year by shopping at Wal-Mart. Wow!
So, let’s look at what that has meant for me in the past several years since I have been shopping at Wal-Mart (2005-2009). Multiplying $700 per year times the 5 years would yield a total savings of $3,500.
Assuming that I placed this money in my Roth IRA account and invested it until retirement at the age of 65 years old (and assuming the 80 year historical average return of 12.4% in the stock market), this would result in a nest egg of $600,854 at the end of the 41 year period. Applying the effects of inflation to this sum (assume 3.2%), this would yield $165,159.
This is quite amazing if you ask me!