Wal-Mart has more money than most countries.
Just to get an idea of what the Supercenters are doing for WM, in 1995 (I may be wrong about the year, but not the other numbers) Wal-Mart was in Debt $130 Million from the failed "Hyper-Mart" experiance. K-Mart opened a store with a Grociery section in California as an experiment and sold K-Mart brand food. Wal-Mart decided they needed to do the same thing in order to compete in that market but instead of investing in their own label for food, they sold brand names. In one year Wal-Mart opened 10 more "Supercenters" and had not only paid off that $130 Million, they were up $20 million per store.
Now that they have perfected the supercenter and their distrubition centers, Wal-Mart profits an average of $2 million a day that they keep reinvesting into growth because they feel like they have only tapped a small portion of the possible market.
They are the largest employeer in the world, surpassing even the US Government. That is Power...if they ever get their own military they could take over the world.