WalMart has ~10x the stores as Costco across the US. Costco exists primarily in large metro areas and attracts shoppers who buy in bulk (including many small businesses, not your average grocery shopper), and focuses on a much narrower range of products. By setting up shop nearly everywhere and selling pretty much everything, Walmart eviscerated small towns in a way that Costco did not.
Plus, the way WalMart compensates and treats its store employees compared to Costco is night and day.
Plus, the way WalMart compensates and treats its store employees compared to Costco is night and day.