WalMart managers are under the gun to maximize profits. Unsold product taking up shelf space costs money. If a particular brand (including the "house" brand) does not sell well in a particular area, its shelf space will be surrendered to a product that does sell well. WalMart bashers can allege what they will about WalMart's sins of commission or ommission, but that retailer's business model works. Just ask K-mart, Sears, and Target.