That's not entirely accurate. Walmart offers DSV (drop ship vendors) which is basically inventory as a service. Walmart pays the third party sellers for storing

That's not entirely accurate. Walmart offers DSV (drop ship vendors) which is basically inventory as a service. Walmart pays the third party sellers for storing and shipping the item, but takes on the overhead of customer service and returns. The customer is never made aware of the fact that they bought it from a third party because even the shipping label is customized to match Walmart's labels.