This article on Wal-Mart sums up why I don't investment in any business where the principal customer is "low end". They're (sadly) the most vulnerable to very small economic changes. A person making minimum wage -- is just barely scraping by --- hit this person with 40 or 50 bucks a month in decreased income (for whatever reason) and they're hosed!
NOW -- there's been no official announcement from Wal-Mart - but usually these types of "leaks" have some basis in truth.
http://www.telegraph.co.uk/finance/n...ed-emails.html