Internally, Walmart is the a larger planned economy than the Soviet Union ever was. If you have a product you agree to sell in Walmart you basically give up total control. They tell you how to manufacture it, where/when to sell, and even at what price. There's a tongue-in-cheek 2019 book exploring this idea called The People's Republic of Walmart: How the World's Biggest Corporations are Laying the Foundation for Socialism. Cory Doctorow wrote about it
https://archive.ph/cnDtu