How is that different from socialism? The only difference is, with socialism, the "ruling caste" would be the government.
Also, you use this Wal-Mart analogy as if to say that they are a corporation with absolute totalitarian control, like they have the power to keep people down via low wages. This isn't true. Wal-Mart is used by many people as a stepping stone to better stations in life. That is the beauty of capatalism. As long as you're willing to work hard, noone can hold you back except yourself.